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PhET Interactive Simulations
University of Colorado Boulder


  • Friction
  • Thermodynamics
  • Heat


Move the Chemistry book and observe what happens. Note that the interactive elements in this sim have simple description that can be accessed using a screen reader.

Sample Learning Goals

  • Describe a model for friction at a molecular level.
  • Describe matter in terms of molecular motion. The description should include: diagrams to support the description, how the temperature affects the image, what are the differences and similarities between solid, liquid and gas particle motion; how the size and speed of gas molecules relate to everyday objects.
Version 1.4.1
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