Resources
Free books, simulations, tools and reference sheets, chosen and shared by teachers and learners. Pick a subject and a level to see what is there.
SimulationsExternal link
Stretch a spring and see the restoring force, displacement, and potential energy relate to each other. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Drag objects across a surface and watch friction generate heat at the atomic level. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Change length, mass, and gravity to explore what actually determines a pendulum's period. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Send a skater along a track and watch kinetic, potential, thermal, and total energy in real time. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Drive a string with adjustable frequency, amplitude, damping, and tension to see how waves form and travel. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Launch a projectile and vary speed, angle, and height to see how each changes its trajectory. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Push objects, add friction, and see the net force, mass, and acceleration update live. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Build real circuits with batteries, resistors, and switches, and measure current and voltage as you go. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).
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Place planets, moons, and stars and watch gravity alone shape their orbits. Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu).