Forces / Learn
Learn physics
Read a short lesson, then try it live in the lab beside it. Forces covers classes 9 to 12 with eleven interactive labs, three animated explainers, a 151-question quiz, ten practice games and a constants reference. Every lab has step-by-step lessons organised by class — the same "concept, then practice" approach as Re-agents' learn hub.
Mechanics playground
Projectile motion, free fall, pendulum/SHM and collisions — sliders for mass, angle, velocity and gravity, with live v-t and s-t graphs.
labWork, power & energy lab
Work at any 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 — with live energy bars and worked explanations.
labNewton's laws & friction lab
Force and motion (inertia, F = ma), static and kinetic friction, a block on a rough slope with the angle of repose, strings and contact forces, and a person on a scale in a lift — with free-body diagrams and worked explanations.
labRefraction & prisms lab
Snell's law and total internal reflection, a glass slab and apparent depth, a prism that splits white light, an optical fibre and the lens-maker's formula traced ray by ray.
labCircuit builder
Build a custom series or parallel circuit with up to 15 resistors, bulbs and capacitors, set the battery's internal resistance, and watch the current actually flow.
labOptics lab
Draggable ray diagrams for concave/convex mirrors and lenses, with a live two-ray construction and real/virtual/erect/inverted classification.
labWaves & sound lab
Standing waves on a string, two-source interference with a draggable detector, and the Doppler effect.
labRotational motion sandbox
Torque and balance, a rolling-shapes race, and a spinning disk that conserves angular momentum.
labThermodynamics visualizer
A kinetic-theory gas box with pressure measured from real particle collisions, and a PV-diagram piston sandbox for all four classic processes.
labElectricity & magnetism lab
Draggable charges with real traced field lines, a moving magnet inducing EMF, and a live R-L-C phasor diagram.
labModern physics
Bohr's hydrogen orbits, the photoelectric effect, and semiconductor energy bands — animated diagrams with the key formulas.
explainerLogic gate lab
Wire up to 10 AND/OR/NOT/NAND/NOR/XOR/XNOR gates together and press Check answer for a slow, fully-explained reveal of the output — plus 10 preset circuits and JEE/NEET-style practice questions.
labPhysics quiz
151 questions across classes 9 to 12 — pick a level, answer 10 at random, and get an explanation for every answer.
quizPhysics mini-games
Free Body Diagram, Circuit Match, Unit Rush, Ray Tracer, Wave Reader, Logic Rush, Torque Balance, Gas Process, EM Quiz and Quantum Quiz — ten quick drill games, scores saved on this device.
gamesPhysics constants
Speed of light, gravitational constant, Planck's constant and more — 2019 SI values with a note on where each is used.
reference50 physics myths, busted
Heavy things fall faster? No gravity in space? Lightning never strikes twice? Fifty common myths, each with the truth, the physics and something to try at home. Includes a guess mode.
read & laughHistory of physics
A scrolling timeline from Aristotle to the transistor — 25 scientists and experiments, each animated, with links into the lab that covers what they discovered.
historyBy class
Motion & Force
- Distance, displacement, speed, velocity — Mechanics playground
- Equations of motion, graphs — Mechanics playground
- Newton's three laws — Mechanics playground, Free Body Diagram
- Gravitation & free fall — Mechanics playground
- Work, energy, power — Rotational motion sandbox
Light, Electricity & Magnetism
- Reflection & refraction, mirrors, lenses — Optics lab, Ray Tracer
- The human eye — Optics lab
- Electric current, potential, resistance — Circuit builder, Unit Rush
- Series & parallel circuits — Circuit builder, Circuit Match
- Magnetic effects of current — Electricity & magnetism lab
Mechanics, Thermodynamics & Waves
- Kinematics in 2D, projectile motion — Mechanics playground
- Circular motion, SHM & pendulum — Mechanics playground
- Work-energy theorem, collisions — Mechanics playground
- Rotational motion, torque & angular momentum — Rotational motion sandbox
- Kinetic theory & thermodynamics — Thermodynamics visualizer
- Waves & sound — Waves & sound lab
Electrostatics, Current, Optics, Modern Physics & Digital Electronics
- Electric fields & potential — Electricity & magnetism lab
- Current electricity, circuits — Circuit builder
- Ray & wave optics — Optics lab, Waves & sound lab
- Electromagnetic induction & AC — Electricity & magnetism lab
- Photoelectric effect, atoms & nuclei — Modern physics
- Logic gates (AND, OR, NOT, NAND, NOR, XOR, XNOR) — Logic gate lab