Interactive Tools
Physics Simulations
Interactive simulations from PhET (University of Colorado Boulder). Experiment with gravity, light, quantum mechanics, and more—right in your browser.
Astrophysics
Gravity and Orbits
Explore how gravity controls the motion of solar system objects. Adjust masses and distances to see orbital changes.
Open full simulation →General Physics
Gravity Force Lab
Visualize the gravitational force between two objects. Adjust mass and distance to see how force changes.
Open full simulation →Quantum Mechanics
Quantum Tunneling
Watch quantum particles tunnel through energy barriers. Explore wave functions and probability distributions.
Open full simulation →General Physics
Wave Interference
Make waves with a dripping faucet, audio speaker, or laser. Observe interference, diffraction, and refraction.
Open full simulation →Astrophysics
Blackbody Spectrum
How does the spectrum of an object change as it heats up? Explore stellar temperatures and Wien's law.
Open full simulation →Solar System
My Solar System
Build your own system of heavenly bodies and watch gravitational ballet. Design a stable solar system or watch it fly apart.
Open full simulation →Simulations provided by PhET Interactive Simulations, University of Colorado Boulder. Licensed under CC-BY.