Mechanics
16 experimentsProjectiles, pendulums, collisions, springs, levers and chaos.
Free · No install · Works offline
The physics lab that fits in your browser.
Build, run and measure real physics. Drop a pendulum, fire a cannon, trace laser beams through a prism or watch a gas obey Maxwell–Boltzmann — with live graphs and the theory one tap away.
- 61
- ready experiments
- 8
- fields of physics
- 3
- languages
- 0
- servers needed
t = 0.00 sN = 15Δtcycle = 60 s
Eight fields of physics, one canvas
Every object obeys the same 2D engine — rigid bodies, joints, fields, rays, fluids and particles all interact on the same board.
Waves & Sound
9 experimentsRipple tanks, interference, diffraction, Doppler and resonance.
Electromagnetism
8 experimentsField lines, Coulomb’s law, Lorentz force and circuits.
Optics
8 experimentsRay tracing with mirrors, lenses, prisms, fibres and rainbows.
Thermodynamics
5 experimentsKinetic theory, Maxwell–Boltzmann, heat conduction.
Fluids
5 experimentsBuoyancy, hydrostatic pressure and a real-time wind tunnel.
Gravitation
4 experimentsOrbits, Kepler’s laws, escape velocity and binary stars.
Modern Physics
5 experimentsPhotoelectric effect, half-life, blackbody, relativity.
Start with a classic
Each experiment opens with the theory, what to observe and suggestions to try. Change any value and see what happens.
MechanicsSimple Pendulum: Period vs. Length
The period depends only on the length.
MechanicsProjectile Motion: Complementary Launch Angles
30° and 60°: same range.
Waves & SoundYoung’s Double-Slit Experiment
Plane waves through two slits.
OpticsDispersion of White Light by a Prism
White light becomes a rainbow (Newton).
ThermodynamicsIdeal Gas and Kinetic Theory
Pressure as molecules hitting the walls.
FluidsBuoyancy: Archimedes’ Principle
Sink or float? It depends on density.
GravitationPlanetary Orbits and Kepler’s Third Law
Orbits, periods and a moon.
MechanicsDouble Pendulum: Deterministic Chaos
Two almost identical starts, completely different futures.
FluidsWind Tunnel: Flow Around Obstacles and Vortex Shedding
Airflow around a cylinder and a wing-like plate.
Modern PhysicsPhotoelectric Effect
Einstein and light made of photons.
ElectromagnetismCharged Particles in a Magnetic Field (Lorentz Force)
Lorentz force and circular motion.
OpticsRainbow in a Water Droplet
Refraction, internal reflection and dispersion.
Built like a real lab, not a slideshow
Live graphs & data
Position, velocity, energy and more, plotted while it runs. Export to CSV for your spreadsheet.
Works offline
Install it as an app on phones, tablets and computers. After the first visit everything runs without internet — and it checks for updates when you open it.
Private by design
Every simulation and extension runs 100% in your browser. Your projects stay on your device unless you choose to save them to your Google account.
Extensible
Create new objects, forces and experiments in plain JavaScript. Official extensions add circuits, photogates, blackbody radiation and resonance.
Cloud save with Google
Sign in with Google to keep your projects in sync across devices. Optional — the lab works fully without an account.
Any screen
Designed for touch and mouse: bottom sheets on phones, side panels on desktops, keyboard shortcuts for power users.
Validated against theory
The engine integrates at 240 steps per second. Measured results from the built-in experiments match textbook predictions:
| Experiment | Simulated | Theory |
|---|---|---|
| Simple pendulum period (L = 5 m) | 4.52 s | 4.49 s |
| Mass–spring period (m = 2 kg, k = 40 N/m) | 1.403 s | 1.405 s |
| Free-fall acceleration | 9.80 m/s² | 9.80 m/s² |
| Block sliding on a 30° ramp (μ = 0.1) | 4.051 m/s² | 4.051 m/s² |
| Submerged fraction of wood in water | 0.611 | 0.600 |
| Circular orbit period | 8.10 s | 8.14 s |
Made for classrooms
Share a direct link
Every experiment has its own address: send /app#exp=pendulo and students land right in it.
Project it
Clean themes for projectors and whiteboards, big readable labels and a presenter-friendly play button.
Collect data
Students measure with rulers, photogates and live graphs, then export CSV for analysis.
Three languages
The whole interface and every explanation in English, Portuguese and Spanish.
Frequently asked questions
Is Physics Lab free?
Yes. The lab and all experiments are free to use in the browser, with no installation. Some experiments may be marked Premium by the administrator in the future; the free collection keeps working without an account.
Does it work without internet?
Yes. Open it once and install it as an app (or just keep it open): every experiment is stored on your device and runs offline. When you are online, the app checks for updates each time it opens.
Is it safe? Does it run code on a server?
All simulations and extensions run 100% inside your browser. No physics code runs on a server, and extensions you install never leave your device.
Which devices are supported?
Any modern browser on Windows, macOS, Linux, ChromeOS, Android and iOS/iPadOS — computers, tablets and phones, with mouse, pen or touch.
Can I create my own experiments?
Yes. Build scenes with the tools and save them as files or in your Google account, or write extensions in JavaScript to add new objects and forces.
What physics topics are covered?
Mechanics, waves and sound, electromagnetism, geometric optics, thermodynamics and kinetic theory, fluids, gravitation and orbits, and modern physics (photoelectric effect, radioactive decay, blackbody radiation and special relativity).
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