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.
A crane lifts a crate at constant speed. P = F·v in real time, W = mgh fills the energy bar. Crank the speed up — same work, more power, less time.
See how a force at angle θ decomposes into Fx = F·cosθ and Fy = F·sinθ. Tilt the angle and watch the components rebalance live.
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.