Physics you can drag, slide and measure

Forces — part of iLabs — is a free set of browser-based physics learning tools built for students: a mechanics playground (projectile motion, free fall, collisions, pendulum, spring-mass and circular-motion SHM with force vectors, energy bars and live graphs, and s-t graphs), a work, power & energy lab (work at an angle, the work–energy theorem on a rough slope, energy conservation on a loop-the-loop track and the power of a car and a motor), a Newton's laws & friction lab (force and motion, static and kinetic friction, a block on a rough incline, strings, contact forces and a person on a scale in a lift), a circuit builder (a custom series/parallel circuit of up to 15 resistors, bulbs and capacitors with live current/voltage readouts and an animated current-flow view), a refraction & prisms lab (Snell's law, total internal reflection, a prism with dispersion, an optical fibre and the lens-maker's formula with ray tracing), an optics lab (ray diagrams for mirrors and lenses), a waves & sound lab (standing waves, interference, the Doppler effect), a rotational motion sandbox (torque, a rolling-shapes race, angular momentum conservation), a thermodynamics visualizer (a kinetic-theory gas box with measured pressure, and a PV-diagram piston sandbox), and an electricity & magnetism lab (traced field lines, electromagnetic induction, an R-L-C phasor diagram), a logic gate lab (wire up to 10 AND/OR/NOT/NAND/NOR/XOR/XNOR gates and check the answer with a slow, explained reveal), plus animated modern physics explainers on the Bohr model, the photoelectric effect and semiconductor bands, alongside a learn section, mini-games, a quiz and a constants reference. No sign-up, works on any device, always free.