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  <url>
    <loc>https://interactives.ck12.org/simulations/physics/cassegrain-telescope/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/telescope.jpg</image:loc>
      <image:title>Cassegrain Telescope</image:title>
      <image:caption>Learn about the law of reflection by curved mirrors and how the shape and size of a telescope impacts its observing capabilities.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/prom-night/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/prom-night.jpg</image:loc>
      <image:title>Prom Night</image:title>
      <image:caption>Understand the law of reflection by plane mirrors and the formation of virtual images.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/at-the-crossroads/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/at-the-crossroads.jpg</image:loc>
      <image:title>At The Crossroads</image:title>
      <image:caption>Learn about making conversions between different types of units by negotiating with a trader at the crossroads.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/irwin-2d/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/irwin-ruthie-2d.jpg</image:loc>
      <image:title>Irwin 2D</image:title>
      <image:caption>Learn about the trajectories in two dimensions.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/doppler-ducks/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/doppler-duck.jpg</image:loc>
      <image:title>Doppler Ducks</image:title>
      <image:caption>Learn about the Doppler Effect in the context of a duck swimming across a pond.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/bobsled/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/bobsled.jpg</image:loc>
      <image:title>Bobsled</image:title>
      <image:caption>Learn about centripetal motion in the context of a bobsled on a track.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/newtons-cannon/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/newtons-cannon.jpg</image:loc>
      <image:title>Newton's Cannon</image:title>
      <image:caption>Learn about orbits and how an object can stay in orbit under the influence of gravity.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/violin/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/violin.jpg</image:loc>
      <image:title>Violin</image:title>
      <image:caption>Learn about wave harmonics on a string by looking closely at the sound produced by a violin.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/portrait-gallery/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/portrait-gallery.jpg</image:loc>
      <image:title>Portrait Gallery</image:title>
      <image:caption>Learn about adding force vectors in two dimensions using the example of a painting hanging from two strings.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/driverless-car/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/driverless-car.jpg</image:loc>
      <image:title>Driverless Car</image:title>
      <image:caption>Learn about adding two vectors together by components in the context of a GPS-style city map.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/butterfly-stroke/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/butterfly-stroke.jpg</image:loc>
      <image:title>Butterfly Stroke</image:title>
      <image:caption>Learn about the relationship between velocity and position for a swimmer.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/model-rocket/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/model-rocket.jpg</image:loc>
      <image:title>Model Rocket</image:title>
      <image:caption>Learn about the relationship between position and velocity for a model rocket during launch and in free-fall.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/irwin-and-ruthie/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/irwin-and-ruthie.jpg</image:loc>
      <image:title>Irwin and Ruthie</image:title>
      <image:caption>Learn about the relationship between position, velocity, and acceleration for two objects in one-dimensional motion.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/cliff-diver/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/cliff-diver.jpg</image:loc>
      <image:title>Cliff Diver</image:title>
      <image:caption>Learn about the relationship between position and velocity for a diver accelerating under the influence of gravity and air resistance.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/tire-pressure/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/tire-pressure.jpg</image:loc>
      <image:title>Tire Pressure</image:title>
      <image:caption>Uncover the relationship between pressure, force, and contact area in the context of a truck tire.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/pirate-ship/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/pirate-ship-battle.jpg</image:loc>
      <image:title>Pirate Ship</image:title>
      <image:caption>Learn about Newton's 3rd Law, and how the concept of the 'force pair' allows us to understand interactions between objects.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/bow-and-arrow/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/bow-and-arrow.jpg</image:loc>
      <image:title>Bow And Arrow</image:title>
      <image:caption>Learn about the elastic (spring) force, Hooke's Law, and the energy stored in an elastic device in the context of a bow &amp; arrow.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/everglades-airboat/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/everglades-airboat.jpg</image:loc>
      <image:title>Everglades Airboat</image:title>
      <image:caption>Learn about Newton's 2nd Law - the relationship between force, mass, and acceleration, for a wind-powered boat.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/hot-air-balloon/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/hot-air-balloon.jpg</image:loc>
      <image:title>Hot Air Balloon</image:title>
      <image:caption>Learn about Newton's 2nd Law - the relationship between force, mass, and acceleration, for a hot air balloon.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/elevator/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/elevator.jpg</image:loc>
      <image:title>Elevator</image:title>
      <image:caption>Explore the notions of &amp;quot;apparent weight&amp;quot; through a Newton's 2nd Law analysis of a trip in an elevator.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/airplane/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/airplane.jpg</image:loc>
      <image:title>Airplane</image:title>
      <image:caption>Explore different types of forces acting on a airplane, including lift, drag, thrust, and gravity. learn about the relationship between the net unbalanced force acting on an object and its acceleration.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/sprinter/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/sprinter.jpg</image:loc>
      <image:title>Sprinter</image:title>
      <image:caption>Learn about static friction, kinetic friction, and slipping in the context of human motion.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/malt-shop/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/malt-shop.jpg</image:loc>
      <image:title>Malt Shop</image:title>
      <image:caption>Learn about kinetic friction and how objects slide to a stop under the influence of friction.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/horse-and-cart/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/horse-and-cart.jpg</image:loc>
      <image:title>Horse And Cart</image:title>
      <image:caption>Learn about Newton's Third Law, force calculations in two dimensions, and the interaction of multiple objects in the context of a horse pulling a cart.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/water-fountain/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/water-fountain.jpg</image:loc>
      <image:title>Water Fountain</image:title>
      <image:caption>Learn about projectile motion and its relevance to the shape of a stream of water.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/archery/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/archery-2.jpg</image:loc>
      <image:title>Archery</image:title>
      <image:caption>Learn about projectile motion and predicting the path of a fired arrow.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/phases-of-the-moon/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/phases-of-the-moon.jpg</image:loc>
      <image:title>Phases of the Moon</image:title>
      <image:caption>Learn how the steady motion of the Moon around the Earth, and the phases created by the relative position of the Earth, Sun, and Moon, allow us to tell time by simply looking at the shape and orientation of the Moon.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/tetherball/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/tetherball.jpg</image:loc>
      <image:title>Tetherball</image:title>
      <image:caption>Learn about centripetal motion in the context of a game of tetherball.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/loop-the-loop/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/loop-the-loop.jpg</image:loc>
      <image:title>Loop The Loop</image:title>
      <image:caption>Learn about centripetal motion in the context of a roller coaster going through a loop-the-loop and over a hill.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/clarkes-dream/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/clarke-dream.jpg</image:loc>
      <image:title>Clarke's Dream</image:title>
      <image:caption>Learn about geosynchronous orbits and their use in satellite communication.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/astronaut-training-chamber/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/astronaut-training-chamber.jpg</image:loc>
      <image:title>Astronaut Training Chamber</image:title>
      <image:caption>Uncover the relationship between weight and mass, on Earth and beyond.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/walk-the-tightrope/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/walk-the-tightrope.jpg</image:loc>
      <image:title>Walk The Tightrope</image:title>
      <image:caption>Understand the concept of rotational inertia (moment of inertia) by analyzing the motion of a circus tightrope walker.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/newtons-apple/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/newtons-apple.jpg</image:loc>
      <image:title>Newton's Apple</image:title>
      <image:caption>Learn about the universal law of gravity and the role Newton played in relating terrestrial and celestial mechanics to one another.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/space-station/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/next-gen-space-station.jpg</image:loc>
      <image:title>Space Station</image:title>
      <image:caption>Learn about orbits in the context of a next generation space station. </image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/journey-to-mars/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/journey-to-mars.jpg</image:loc>
      <image:title>Journey To Mars</image:title>
      <image:caption>Learn about Kepler's Laws of Motion by planning a trip to Mars using a Hohmann transfer orbit.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/ballistics-tests/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/ballistics-tests.jpg</image:loc>
      <image:title>Ballistics Tests</image:title>
      <image:caption>Practice with the concepts of conservation of momentum and energy by analyzing a special case of the ballistic pendulum.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/crash-test-dummy/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/crash-test-dummy.jpg</image:loc>
      <image:title>Crash Test Dummy</image:title>
      <image:caption>Learn about the relationship between force, time, impulse and momentum in collisions.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/bumper-cars/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/bumper-cars.jpg</image:loc>
      <image:title>Bumper Cars</image:title>
      <image:caption>Learn about the relationship between force, time, impulse and momentum in collisions.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/collisions/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/bumper-cars-2.jpg</image:loc>
      <image:title>Collisions</image:title>
      <image:caption>Uncover the law of conservation of momentum by examining a variety of bumper car collisions</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/wind-turbine/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/wind-turbine.jpg</image:loc>
      <image:title>Wind Turbine</image:title>
      <image:caption>Learn about the concept of efficiency as it relates to power generation at a wind turbine.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/ramp-and-piano/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/ramp-piano.jpg</image:loc>
      <image:title>Ramp And Piano</image:title>
      <image:caption>Learn about the relationship between force, work, and energy using a simple machine.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/see-saw/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/see-saw.jpg</image:loc>
      <image:title>See Saw</image:title>
      <image:caption>Learn how two objects of different weights can balance one another on a see-saw.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/drawbridge/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/drawbridge.jpg</image:loc>
      <image:title>Drawbridge</image:title>
      <image:caption>Learrn about torque balance in the context of a medieval drawbridge.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/orbital-motion/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/orbital-motion.jpg</image:loc>
      <image:title>Orbital Motion</image:title>
      <image:caption>Understand angular momentum conservation in the absence of an applied torque in the context of planetary orbits.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/unicycle/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/unicycle.jpg</image:loc>
      <image:title>Unicycle</image:title>
      <image:caption>Understand the phenomenon of rolling without slipping, even under an applied torque, in the context of a unicycle.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/yo-yo/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/yo-yo.jpg</image:loc>
      <image:title>Yo Yo</image:title>
      <image:caption>Understand the dynamics of rotating objects in the context of a spinning yo-yo.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/bowling-alley/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/bowling-alley.jpg</image:loc>
      <image:title>Bowling Alley</image:title>
      <image:caption>Understand how the transition from slipping to rolling occurs in the context of a thrown bowling ball.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/block-and-tackle/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/block-and-tackle.jpg</image:loc>
      <image:title>Block And Tackle</image:title>
      <image:caption>Learn about the relationship between force, work, energy, and mechanical advantage using a simple machine.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/trampoline/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/trampoline.jpg</image:loc>
      <image:title>Trampoline</image:title>
      <image:caption>Learn about the exchange of different types of potential energy and kinetic energy as a boy bounces on a trampoline.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/high-energy-particles/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/high-energy-particles.jpg</image:loc>
      <image:title>High Energy Particles</image:title>
      <image:caption>Uncover the relationship between speed and kinetic energy in the context of a particle accelerator.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/roller-coaster/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/roller-coaster.jpg</image:loc>
      <image:title>Roller Coaster</image:title>
      <image:caption>Learn about the conservation of energy in the context of a roller coaster.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/ski-jump/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/ski-jump.jpg</image:loc>
      <image:title>Ski Jump</image:title>
      <image:caption>Learn about the conservation of energy in the context of a ski jump.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/the-marina/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/the-marina.jpg</image:loc>
      <image:title>The Marina</image:title>
      <image:caption>Learn about the interference and diffraction patterns that result when a wave passes through one or two thin openings.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/heat-engine/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/heat-engine.jpg</image:loc>
      <image:title>Heat Engine</image:title>
      <image:caption>Learn about the conversion of heat energy to mechanical energy in the context of a heat engine.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/hot-oven/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/hot-oven.jpg</image:loc>
      <image:title>Hot Oven</image:title>
      <image:caption>Learn about the relationship between heat energy and temperature in the context of a hot kitchen oven.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/scuba-training/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/scuba-training.jpg</image:loc>
      <image:title>Scuba Training</image:title>
      <image:caption>Learn about the principle of buoyancy and its relationship to the pressure gradient in a liquid in a gravitational field.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/runaway-balloon/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/runway-balloon.jpg</image:loc>
      <image:title>Runaway Balloon</image:title>
      <image:caption>Learn about the Combined Gas Law and how it can be used to understand the motion of a lost balloon.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/pan-flute/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/pan-flute.jpg</image:loc>
      <image:title>Pan Flute</image:title>
      <image:caption>Learn about wave harmonics in a column of air by looking closely at the sound produced by a pan flute.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/stadium-wave/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/stadium-wave.jpg</image:loc>
      <image:title>Stadium Wave</image:title>
      <image:caption>Use a classic sports stadium 'wave' to learn about concepts important to wave motion and interference.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/stow-lake/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/stow-lake.jpg</image:loc>
      <image:title>Stow Lake</image:title>
      <image:caption>Learn about the patterns of wave interference in water.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/light-wave/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/light-wave.jpg</image:loc>
      <image:title>Light Wave</image:title>
      <image:caption>Learn about light as an electromagnetic wave, and how to relate its wavelength and frequency to the electromagnetic field pattern it creates.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/rose-colored-glasses/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/rose-colored-glasses.jpg</image:loc>
      <image:title>Rose Colored Glasses</image:title>
      <image:caption>See the world through different colored glasses; understand, as a result, the nature of color and light.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/diamond-cut/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/diamond-cut.jpg</image:loc>
      <image:title>Diamond Cut</image:title>
      <image:caption>Learn about refraction, reflection, and total internal reflection in the context of a light ray passing into and out of a diamond.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/least-time/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/least-time.jpg</image:loc>
      <image:title>Least Time</image:title>
      <image:caption>Explore how Snell's Law arises out of the principle of least time; understand how light rays change direction at interfaces between materials.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/contact-lens/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/contact-lens.jpg</image:loc>
      <image:title>Contact Lens</image:title>
      <image:caption>Learn about how light rays from distant objects are focused by the lens in your eye and also by contact lenses.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/magnifying-glass/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/magnifying-glass.jpg</image:loc>
      <image:title>Magnifying Glass</image:title>
      <image:caption>Learn about the type, size, location, and orientation of the image that forms when a thin lens is used to view an object.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/dollhouse/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/dollhouse.jpg</image:loc>
      <image:title>Dollhouse</image:title>
      <image:caption>Learn about the analysis of parallel circuits in the context of a realistic household circuit.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/marquee-lights/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/marquee-lights.jpg</image:loc>
      <image:title>Marquee Lights</image:title>
      <image:caption>Learn about different ways you can wire an electric circuit, and how the brightness of the lights depends on how they are configured.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/flashlight/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/flashlight.jpg</image:loc>
      <image:title>Flashlight</image:title>
      <image:caption>Learn about electric circuits, the flow of current, electrical resistance, and electrical power dissipation by exploring the operation of a flashlight.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/lightning-rod/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/lightning-rod.jpg</image:loc>
      <image:title>Lightning Rod</image:title>
      <image:caption>Learn about charge, electric field, and electric potential in the context of a lightning strike.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/coulombs-law/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/coulombs-law.jpg</image:loc>
      <image:title>Coulomb's Law</image:title>
      <image:caption>Learn how the placement of charges leads to electric field and electric potential patterns in nearby space.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/flashing-neon-light/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/flashing-neon-light.jpg</image:loc>
      <image:title>Flashing Neon Light</image:title>
      <image:caption>Learn about how capacitors are used in circuits to create transient events such as the flash of a light bulb.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/power-lines/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/power-lines.jpg</image:loc>
      <image:title>Power Lines</image:title>
      <image:caption>Learn about the relationship between electric potential, current, and resistance in the context of high-voltage AC power lines.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/telegraph/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/telegraph.jpg</image:loc>
      <image:title>Telegraph</image:title>
      <image:caption>Explore the concept of Morse Code and how signals are transfered over great distances by using telegraph machines based on electromagnets.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/electric-analogies/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/electric-analogies.jpg</image:loc>
      <image:title>Electric Analogies</image:title>
      <image:caption>Explore a different way of thinking about electricity as a way to become familiar with the concept of potential, current, and resistance.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/touch-screen/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/touch-screen.jpg</image:loc>
      <image:title>Touch Screen</image:title>
      <image:caption>Learn about how capacitances add in series and parallel by exploring the physics behind a touch-screen device.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/galvanometer/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/galvanometer.jpg</image:loc>
      <image:title>Galvanometer</image:title>
      <image:caption>Understand how the magnetic field generated by loops of current-carrying wire is used to create measuring devices like voltmeters and ammeters.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/field-lines/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/field-lines.jpg</image:loc>
      <image:title>Field lines</image:title>
      <image:caption>Understand the size and shape of the Earth's magnetic fields, explore the magnetic fields of other planets.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/particle-tracks/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/particle-tracks.jpg</image:loc>
      <image:title>Particle Tracks</image:title>
      <image:caption>Understand how magnetic forces applied to charges in motion generate circular (centripetal) motion, and how the paths these particles leave provide insight into their nature.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/doorbell/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/doorbell.jpg</image:loc>
      <image:title>Doorbell</image:title>
      <image:caption>Understand how magnetic fields generated by solenoid coils can be used to create an operating doorbell.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/electric-motor/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/electric-motor.jpg</image:loc>
      <image:title>Electric Motor</image:title>
      <image:caption>Learn how magnetic forces acting on current-carrying wires can be used to drive an electric motor.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/ac-transformer/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/ac-transformer.jpg</image:loc>
      <image:title>AC Transformer</image:title>
      <image:caption>Learn about how high-voltage alternating current (AC) electricity generated by a power station is converted into low-voltage AC electricity for your home.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/preschool-races/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/preschool-races.jpg</image:loc>
      <image:title>Preschool Races</image:title>
      <image:caption>Learn about the relationship between rotational and translational kinetic energy, and how each are exchanged when objects roll down inclined ramps.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/atomic-colors/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/atomic-colors.jpg</image:loc>
      <image:title>Atomic Colors</image:title>
      <image:caption/>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/subatomic-particle-zoo/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/subatomic-particle-zoo.jpg</image:loc>
      <image:title>Subatomic Particle Zoo</image:title>
      <image:caption/>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/marie-curies-classroom/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/marie-curies-classroom.jpg</image:loc>
      <image:title>Marie Curie's Classroom</image:title>
      <image:caption/>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/radiocarbon-dating/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/radiocarbon-dating.jpg</image:loc>
      <image:title>Radiocarbon Dating</image:title>
      <image:caption/>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/black-hole/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/black-hole.jpg</image:loc>
      <image:title>Black Hole</image:title>
      <image:caption/>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/position-displacement/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/displacement.jpg</image:loc>
      <image:title>Position and Displacement Simulation</image:title>
      <image:caption>Explore how distance traveled is affected by taking different paths</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/relative-velocity/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/relative-velocity.jpg</image:loc>
      <image:title>Relative Velocity Simulation</image:title>
      <image:caption>Adjust velocity and observe how it affects the time objects take to travel a given distance</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/first-law/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/first-law-new.jpg</image:loc>
      <image:title>First Law Simulation</image:title>
      <image:caption>Move a sled on ice as directed by telling the person to push, pull, or apply  no force at all</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/friction/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/friction.jpg</image:loc>
      <image:title>Friction Simulation</image:title>
      <image:caption>Explore how much force is needed to overcome the forces of friction</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/angular-speed/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/angular-speed-sim.jpg</image:loc>
      <image:title>Angular Speed Simulation</image:title>
      <image:caption>Explore the relationships between angular and linear speeds by racing a car around a circular track</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/centripetal-force/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/hockey-cp.jpg</image:loc>
      <image:title>Goalie</image:title>
      <image:caption>Explore circular motion and centripetal force by telling a hockey player how to hit a puck.</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/electric-field/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/electric-field.jpg</image:loc>
      <image:title>Electric Fields Simulation</image:title>
      <image:caption>Use electric charges to score a goal with a hockey puck</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://interactives.ck12.org/simulations/physics/rc-circuit/app/index.html</loc>
    <lastmod>2017-07-12</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://interactives.ck12.org/simulations/assets/images/physics/rc-circuit.jpg</image:loc>
      <image:title>Capacitor Simulation</image:title>
      <image:caption>Explore the role of capacitors in circuits within a camera's flash</image:caption>
    </image:image>
  </url>
</urlset>