Open-ended sandbox simulations — adjust the controls and watch the physics respond in real time, with real SI units and live formulas. One phenomenon at a time, explored at your own pace.
Satellite orbiting Earth with Newtonian gravity. Adjust mass, see velocity & force vectors.
All 8 planets with real sizes, distances, elliptical orbits & Kepler's laws.
The 5 points where Sun-Earth gravity balances rotation. Explore the effective-potential landscape and find the saddles and peaks.
Newton's law F = GMm/r² in action. 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 U → KE + Q and read off the efficiency η = 1 − μ/tanθ — 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.
U = R·I in a closed circuit. The resistor literally narrows as R grows, and more electrons stream through as current rises.
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 d·sinθ = n·λ paint the maxima on a screen. Tune λ, line density and screen distance.
Watch wavefronts from N slits interfere in real time. Vary λ, slit count N and spacing d — see d·sinθ = n·λ produce the bright and dark fringes right in front of you.