🔬

Free Lab

All available simulations in one place. No quizzes, no structure — just play.

1.1

Powers of Ten & Units

Measuring the Universe

Zoom from quarks to galaxies

N = 10ⁿ

1.2

Dimensional Analysis

Measuring the Universe

Drag-and-drop unit checker

[LHS] = [RHS]

1.3

Uncertainty & Measurement

Measuring the Universe

Virtual ruler with limited precision

x = x̄ ± δx

1.4

Vectors: Dot & Cross

Measuring the Universe

3D vector playground

|A+B|² = |A|² + |B|² + 2A·B

2.1

1D Kinematics

Motion in Space

Drag a car, see x(t), v(t), a(t) graphs

x = x₀ + v₀t + ½at²

2.2

Projectile Motion

Motion in Space

Launch projectiles at various angles

y = v₀sinθ·t − ½gt²

2.3

Circular Motion

Motion in Space

Spin a ball on a string

a = v²/r

2.4

Reference Frames

Motion in Space

Two observers, one on a moving train

v' = v + V

3.1

Newton's Three Laws

Newton’s Laws & Forces

Push objects of different masses

F = ma

3.2

Weight & Weightlessness

Newton’s Laws & Forces

Elevator scale simulator

N = m(g + a)

3.3

Free Fall & Orbit

Newton’s Laws & Forces

ISS orbit — objects float but gravity is there

v = √(gR)

3.4

Friction

Newton’s Laws & Forces

Push blocks on surfaces, adjust μ

f ≤ μN

3.5

Inclined Planes

Newton’s Laws & Forces

Adjustable ramp with blocks

a = g(sinθ − μcosθ)

4.1

Hooke's Law & Springs

Energy & Work

Stretch springs, see F vs x

F = −kx

4.2

Simple Harmonic Motion

Energy & Work

Mass on spring + pendulum side by side

T = 2π√(m/k)

4.3

Work & Kinetic Energy

Energy & Work

Push a cart, see work integral

W = ΔKE = ½mv²

4.4

Potential Energy & Conservation

Energy & Work

Roller coaster designer

½mv² + mgh = const

4.5

Universal Gravitation

Energy & Work

Place masses, see gravitational field

F = GMm/r²

4.6

Orbits & Escape Velocity

Energy & Work

Launch a rocket — crash, orbit, or escape

v_esc = √(2GM/R)

4.7

Terminal Velocity

Energy & Work

Drop shapes through fluid

v_t = √(2mg/ρCdA)

5.1

Momentum & Impulse

Momentum & Collisions

Ball vs wall vs catcher

J = FΔt = Δp

5.2

Conservation of Momentum

Momentum & Collisions

Billiards — 2D elastic collisions

p_before = p_after

5.3

Elastic vs Inelastic

Momentum & Collisions

Crash carts, compare energy loss

e = (v2′−v1′)/(v1−v2)

5.4

Center of Mass

Momentum & Collisions

Place masses, find COM trajectory

x_cm = Σmᵢxᵢ / M

5.5

Rocket Equation

Momentum & Collisions

Build a rocket, adjust fuel

Δv = vₑ ln(m₀/m_f)

6.1

Moment of Inertia

Rotation & Angular Momentum

Spin different shapes, compare I

I = cmR²

6.2

Torque

Rotation & Angular Momentum

Wrench simulator

τ = r × F

6.3

Angular Momentum

Rotation & Angular Momentum

Ice skater — arms in/out

L = Iω = const

6.4

Physical Pendulums

Rotation & Angular Momentum

Hang shapes from different pivots

T = 2π√(I/mgd)

6.5

Kepler's Laws

Rotation & Angular Momentum

Solar system builder

T² = (4π²/GM)a³

6.6

Rolling Motion

Rotation & Angular Momentum

Race: cylinder vs sphere down ramp

a = g sinθ/(1+I/mR²)

6.7

Gyroscopes & Precession

Rotation & Angular Momentum

3D gyroscope

Ω = mgd/Iω

7.1

Static Equilibrium

Statics & Elasticity

Balance beams

ΣF = 0, Στ = 0

7.2

Stability & Tipping

Statics & Elasticity

Stack blocks, lean a tower

θ_tip = arctan(w/2h)

7.3

Tightrope Walker

Statics & Elasticity

Walk a figure across a rope

α = τ/I

7.4

Elasticity & Young's Modulus

Statics & Elasticity

Stretch materials, see stress-strain

σ = E·ε

8.1

Hydrostatic Pressure & Pascal

Fluids

Hydraulic press

P = P₀ + ρgh

8.2

Atmospheric Pressure

Fluids

Barometer at different altitudes

P_atm ≈ 101,325 Pa

8.3

Archimedes & Buoyancy

Fluids

Sink or float?

F_b = ρ_fluid · V · g

8.4

Bernoulli's Equation

Fluids

Funnel demo + pipe flow lab

P + ½pv² + pgh = const

9.1

Thermal Expansion

Heat & Kinetic Theory

Ball and ring demo

ΔL = αLΔT

9.2

Kinetic Gas Theory

Heat & Kinetic Theory

Box of bouncing molecules

½mv² = ¾kT

9.3

Ideal Gas Law

Heat & Kinetic Theory

Piston chamber

PV = nRT

9.4

Phase Transitions

Heat & Kinetic Theory

Heat water ice→steam

Q = mL

10.1

Breakdown of Classical Mechanics

The Quantum Frontier

Double-slit, one particle at a time

ψ = ψ₁ + ψ₂

10.2

Wave-Particle Duality

The Quantum Frontier

Toggle wave vs particle view

λ = h/p

10.3

Uncertainty Principle

The Quantum Frontier

Measure position vs momentum tradeoff

Δx·Δp ≥ ħ/2

11.1

Coulomb's Law

Electric Charges & Fields

Place charges, see forces

11.2

Polarization

Electric Charges & Fields

Charged rod near neutral objects

11.3

Electric Field Lines

Electric Charges & Fields

Place charges, see field lines

11.4

Gauss's Law

Electric Charges & Fields

Draw Gaussian surfaces

12.1

Electrostatic Potential

Electric Potential & Energy

Topographic voltage map

12.2

E = −∇V

Electric Potential & Energy

Draw potential, see E-field emerge

12.3

Faraday Cage

Electric Potential & Energy

Charge inside/outside a cage

12.4

Lightning

Electric Potential & Energy

Build charge → watch lightning strike

13.1

Capacitance

Capacitors & Dielectrics

Adjust plates, see C change

13.2

Electric Field Energy

Capacitors & Dielectrics

Visualize stored energy

13.3

Dielectrics

Capacitors & Dielectrics

Insert materials between plates

13.4

Van de Graaff Generator

Capacitors & Dielectrics

Charge it up, see sparks

14.1

Ohm's Law

Circuits

Wire with electron flow

14.2

Resistivity

Circuits

Compare copper, rubber, silicon

14.3

Batteries & EMF

Circuits

Build circuits with bulbs

14.4

Kirchhoff's Rules

Circuits

Complex circuit builder

15.1

Lorentz Force

Magnetic Fields & Forces

Shoot charges through B-field

15.2

Cyclotron

Magnetic Fields & Forces

Mass spectrometer — sort isotopes

15.3

Biot-Savart Law

Magnetic Fields & Forces

Draw wire, see B-field

15.4

Ampère's Law & Solenoids

Magnetic Fields & Forces

Wrap coils, see field

16.1

Faraday's Law

Electromagnetic Induction

Move magnet through coil

16.2

Lenz's Law

Electromagnetic Induction

Drop magnet through copper tube

16.3

Dynamos & Generators

Electromagnetic Induction

Spin generator, see AC output

16.4

Eddy Currents

Electromagnetic Induction

Pendulum between magnets

16.5

Magnetic Levitation

Electromagnetic Induction

Levitate magnet — Meissner effect

16.6

Aurora Borealis

Electromagnetic Induction

Solar particles → Earth’s field → aurora

17.1

Inductance & RL Circuits

Inductors, Magnetism & Maxwell

RL circuit — current ramp

17.2

Magnetic Field Energy

Inductors, Magnetism & Maxwell

Energy in inductor’s field

17.3

Dia/Para/Ferromagnetism

Inductors, Magnetism & Maxwell

Materials in B-field

17.4

Hysteresis

Inductors, Magnetism & Maxwell

Trace hysteresis loop

17.5

Maxwell's Equations

Inductors, Magnetism & Maxwell

All four equations visualized

18.1

Transformers

AC Circuits & Resonance

Adjust turns ratio

18.2

RC Circuits

AC Circuits & Resonance

Charge/discharge curve

18.3

LRC Resonance

AC Circuits & Resonance

Sweep frequency, find peak

18.4

Impedance & Phasors

AC Circuits & Resonance

Rotating phasor diagram

19.1

Traveling EM Waves

EM Waves & Optics

E and B fields propagating at c

19.2

Speed of Light

EM Waves & Optics

Historical methods to measure c

19.3

Radiation Pressure

EM Waves & Optics

Solar sail spacecraft

19.4

Snell's Law & Refraction

EM Waves & Optics

Light into glass — adjust angle

19.5

Polarization

EM Waves & Optics

Stack polarizers, rotate

19.6

Rainbows

EM Waves & Optics

Sunlight entering a raindrop

19.7

Double-Slit Interference

EM Waves & Optics

Adjust slits, see pattern

19.8

Diffraction & Gratings

EM Waves & Optics

Single slit, gratings, CD

19.9

Doppler Effect

EM Waves & Optics

Move source — see red/blueshift

20.1

SHO & Phasors

Oscillations Revisited

Phasor + real oscillation

20.2

Beats

Oscillations Revisited

Two tuning forks — hear beats

20.3

Damped Oscillations

Oscillations Revisited

Adjust damping — see 3 regimes

20.4

Driven Resonance

Oscillations Revisited

Drive spring-mass, sweep freq

20.5

Power at Resonance

Oscillations Revisited

Energy peak — wine glass physics

20.6

Transient Phenomena

Oscillations Revisited

Turn driver on/off, see ring up/down

21.1

Two Coupled Oscillators

Coupled Oscillators & Normal Modes

Two pendulums + spring

21.2

Normal Modes

Coupled Oscillators & Normal Modes

Symmetric + antisymmetric modes

21.3

Many Coupled Oscillators

Coupled Oscillators & Normal Modes

Chain of masses — standing waves

21.4

Discrete → Continuous

Coupled Oscillators & Normal Modes

N from 2 → 100, see waves emerge

21.5

The Wave Equation

Coupled Oscillators & Normal Modes

Animated derivation

22.1

Traveling Waves

Waves on Strings & Sound

Pluck string, see pulse travel

22.2

Standing Waves & Harmonics

Waves on Strings & Sound

Guitar string harmonics

22.3

Energy in Waves

Waves on Strings & Sound

Energy density moving with wave

22.4

Sound Cavities

Waves on Strings & Sound

Open/closed tube resonances

22.5

Musical Instruments

Waves on Strings & Sound

Virtual guitar, flute, drum

22.6

Fourier Analysis

Waves on Strings & Sound

Build waveforms from sine waves

23.1

Dispersion & Group Velocity

EM Waves (Advanced)

Wave packet spreading

23.2

EM Wave Solutions

EM Waves (Advanced)

3D E, B, Poynting vector

23.3

Rayleigh Scattering

EM Waves (Advanced)

Why the sky is blue

23.4

Radiation & Reflection

EM Waves (Advanced)

Light bouncing off mirrors

23.5

Waveguides

EM Waves (Advanced)

EM waves in a box

23.6

Brewster's Angle

EM Waves (Advanced)

Reflection at Brewster angle

24.1