Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder

‪Natural Selection‬

By converting our sims to HTML5, we make them seamlessly available across platforms and devices. Whether you have laptops, iPads, chromebooks, or BYOD, your favorite PhET sims are always right …

‪States of Matter‬

Explore natural selection through interactive simulations, observing how traits influence survival in changing environments.

‪Energy Skate Park: Basics‬ 1.1.36

Design and explore your own solar system with interactive simulations, observing gravitational forces and celestial body orbits.

Explore how organisms with different traits survive various selection agents within the environment.

Explore projectile motion through interactive simulations by adjusting parameters like angle and speed to learn about kinematics and factors influencing motion.

Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!