Free interactive science
Push on it and watch what happens.
37 physics and chemistry simulations that run in your browser. Nothing to install, no account, no cost — and every one of them is tied to a chapter you are actually studying.
Start somewhere
All 37 simulations →
Physics · Wave Optics Single-Slit Diffraction A single narrow slit spreads light into a broad central band with faint side maxima.
Physics · Wave Optics Circular Aperture — Airy Rings Light through a round hole forms a bright disk ringed by concentric halos.
Physics · Kinematics Crossing a River — Relative Velocity Aim upstream or straight across and watch the current sweep the boat.
Physics · Kinematics Relative Velocity — The River Crossing (Explainer) A guided, step-by-step walkthrough of the river-crossing vectors.
Physics · Kinematics Bouncing Ball on an Incline A ball dropped onto a slope bounces in ever-shifting parabolic hops.
Physics · Circular Motion Ball on a String — Vertical Circle Whirl a ball in a vertical loop and find the speed the string needs to stay taut.
What's covered
Every card on this site carries a coloured cap. It is the subject's place on the indicator scale — chemistry at the acid end, physics at the alkaline end — so you can read the grid without reading the labels.