Investigate forces, energy, waves, and more with interactive physics simulations. Adjust values, test ideas, and see how the quantities relate.
Satellite orbiting Earth with Newtonian gravity. Adjust mass, see velocity & force vectors.
All 8 planets with real sizes, distances, elliptical orbits & Kepler's laws.
Newton's law of gravity in action: the pull grows with the masses and falls off with the square of the distance. Release a test mass and watch it fall, orbit or escape depending on its initial speed.
Watch galaxies recede in every direction, turning red with distance. Click any galaxy to read its z and Hubble's law.
A block slides down a ramp with friction. Watch potential energy turn into kinetic energy and heat, and read off the efficiency — energy conservation with heat included.
Explore Archimedes' principle with an interactive 3D simulation. Adjust object density and watch it float, sink, or reach neutral buoyancy in real time.
Voltage, resistance and current in a closed circuit. Turn up R and the resistor is drawn thinner while the current through it falls.
Drag wires between pins into a closed circuit — series and parallel emerge from how you connect. Live readouts: equivalent resistance, branch currents, power.
Spinning magnet induces EMF in a coil. Adjust windings and speed, see flux and voltage graphs.
Shine monochromatic light through a diffraction grating and watch the maxima paint themselves on a screen. Tune the wavelength, the line density and the screen distance.
Watch wavefronts from several slits interfere in real time. Vary the wavelength, the number of slits and their spacing — and see the bright and dark fringes appear right in front of you.