PSL

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A universe of experiments

Physics makes sense
when you explore it.

Move a particle. Shape a wave. Bend spacetime. Discover physics through interactive simulations that put the controls in your hands—from everyday motion to the quantum world.

EXPLORE 73 SIMS

Open in your browser. No account needed.

Small changes. Big discoveries. Inside PSL
Trajectories from the three-body gravity simulation
Motion & gravity

Follow the unexpected.

Explore orbits and the delicate balance of gravitational systems.

 Entangled-particle measurements in The Bell Game
The quantum world

See beyond the everyday.

Play The Bell Game. Explore entanglement and compare quantum correlations with classical predictions.

 Electric and magnetic waves in the Maxwell wave propagation simulation
Particles & fields

Make the invisible visible.

Explore Maxwell wave propagation and watch electric and magnetic fields travel together.

Connected ideas. Endless questions.

One lab. A whole spectrum of physics.

Explore mechanics, electromagnetism, waves and optics, thermodynamics, quantum physics, relativity, astronomy, nuclear physics, and the mathematics of complex systems.

MotionWavesMatterEnergySpace & timeQuantum physics

Learn by doing

Curiosity is
your starting point.

Explore freely or follow a guided investigation. Each lab includes a place to begin, explanations, and the equations and assumptions behind the model.

  1. 01

    Make a prediction

    Choose a question. What do you think will happen?

  2. 02

    Change something

    Adjust a parameter and watch the simulation respond.

  3. 03

    Find the connection

    Compare the measurements, explore the equations, and test your next idea.

Experiments Explore

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Featured experiments

1 / 9

Change a parameter. Make a prediction. Compare the result. Explore quantum physics, relativity, and the classical ideas that connect them.

The world library

Build connections

Guided investigations

Follow a sequence or open any experiment independently. Opening a page does not mark a lesson complete.

Scientific foundations

Understand the model behind the image

These are teaching models. Each experiment identifies its equations and assumptions; numerical models and schematic illustrations have different limits.

Models, methods & references →Checks & known limitations →Report a discrepancy →
Interactive models, with assumptions worth understanding. Every preview runs the experiment itself. Previews load in view and pause with the motion control. Your history and favorites stay in this browser when storage is available.

A small guide to the playground

Every world opens inside this workspace. Use the world selector to move between labs, or return to the library to browse.

These are interactive teaching models. The guide beneath each lab describes its assumptions and suggests an experiment to try.

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