Physics
Mechanics, electricity, optics and heat
Primary school5/9
FreeLight and Shadows
Move a torch and watch the shadow grow and shrink
FreeMaking a Bulb Light Up
Complete a circuit with a battery, wires and a bulb
Sound and Vibrations
Pluck strings and tap drums to make high and low sounds
Floating and Sinking
Predict which objects float in a tub of water
FreeRamp Race
Change the slope and surface and race toy cars
Coming soonPushes and Pulls
Push a toy cart with different forces and compare how far it goes
Coming soonMagnets: Attract and Repel
Bring poles together and sort magnetic materials
Coming soonConductors and Insulators
Test materials to see which ones let electricity through
Coming soonFalling Objects
Drop a feather and a ball with and without air
Middle school15/41
FreeUniform Linear Motion
Adjust speed and time to see displacement
Accelerated Motion
Change acceleration and plot the velocity-time graph
Lever Balance
Move the fulcrum and weights to find equilibrium
Pulleys and Pulley Systems
Combine pulleys and compare the pulling force
FreeBuoyancy and Archimedes' Principle
Lower a block into liquid and compare the lost weight with the displaced liquid
FreeLiquid Pressure
Adjust depth and density to see pressure change
FreeOhm's Law
Adjust voltage and resistance, watch the current
Electric Power and Joule Heating
Adjust current and resistance to see heat output
Convex Lens Imaging
Move the object and change the focal length to form real and virtual images
FreeReflection and Refraction of Light
Change the angle of incidence and refractive index
Changes of State
Heat ice and plot the temperature curve
Hooke's Law
Hang weights on a spring and plot the extension
FreePressure and Contact Area
Change force and area to compare pressure
Work and Power
Lift loads at different speeds and compare power
Specific Heat Capacity
Heat water and oil and compare the temperature rise
Coming soonFriction
Change the surface and normal force to measure friction
Coming soonAtmospheric Pressure
Recreate Torricelli's experiment
Coming soonSimple Circuit Builder
Drag batteries, resistors, switches and bulbs
Coming soonSeries and Parallel Circuits
Compare how current and voltage divide
Coming soonElectromagnet
Change coil turns, current and core
Coming soonMagnetic Fields and Field Lines
Move magnets and see the field pattern
Coming soonPlane Mirror Images
Move an object and observe mirror symmetry
Coming soonSound Wave Propagation
Change frequency, amplitude and medium
Coming soonHeat Transfer
Model conduction, convection and radiation
Coming soonDensity
Measure mass and volume and compare materials
Coming soonInertia and Newton's First Law
Remove friction and watch motion continue
Coming soonSimple Machines
Compare the wheel and axle, wedge and screw
Coming soonCenter of Gravity and Stability
Tilt objects and find the balance point
Coming soonDispersion of Light
Send white light through a prism
Coming soonPinhole Camera
Move the screen and pinhole to change the image
Coming soonThe Eye and Vision Correction
Correct nearsight and farsight with lenses
Coming soonConcave and Convex Mirrors
Trace rays off curved mirrors
Coming soonStatic Electricity
Rub materials and watch charges move
Coming soonElectric Motor
Change the current and field to spin the coil
Coming soonOersted's Experiment
Switch on a current and watch the compass needle
Coming soonMeasuring Resistance
Use a voltmeter and ammeter to find resistance
Coming soonPitch and Loudness
Change string length and pluck strength
Coming soonHousehold Circuits and Safety
Wire sockets, fuses and switches safely
Coming soonConcave Lens Imaging
Trace rays through a diverging lens and find the virtual image
Coming soonThermal Expansion
Heat solids, liquids and gases and measure how much they grow
Coming soonTicker Tape and Motion
Read the dot spacing on a tape to find speed and acceleration
High school20/57
FreeProjectile Motion
Adjust launch speed, angle and gravity
Newton's Second Law
Change mass and force, observe acceleration
Uniform Circular Motion
Change radius, angular velocity and centripetal force
FreeSimple Pendulum
Change length, amplitude and gravity, then measure the period
Spring-Mass Oscillator
Change stiffness, mass and damping
FreeMomentum and Collisions
Simulate elastic and inelastic collisions
Conservation of Mechanical Energy
Roll a ball along different tracks
Electric Field and Potential
Place charges and draw equipotential lines
Charged Particles in Fields
Trace paths through electric and magnetic fields
Capacitor Charging and Discharging
Adjust capacitance and resistance, plot the curve
Electromagnetic Induction
Move a magnet or coil, observe the induced current
Transformer
Change primary and secondary turns
Wave Interference
Overlap two sources and see crests and troughs combine
FreeDouble-Slit Interference
Adjust wavelength, slit spacing and screen distance
Photoelectric Effect
Change light frequency, intensity and metal
Ideal Gas Laws
Adjust P, V and T and plot the state diagram
Kepler's Laws
Sweep equal areas along an elliptical orbit
Standing Waves on a String
Change tension and frequency to find harmonics
Doppler Effect
Move a sound source and hear the pitch shift
Radioactive Decay and Half-Life
Watch nuclei decay and plot the curve
Coming soonInclined Plane
Change the incline angle and friction coefficient
Coming soonGravitation and Orbits
Adjust planet mass and initial velocity
Coming soonAC Generator
Change the coil speed and watch the sine wave
Coming soonAtomic Energy Levels
Simulate photon absorption, emission and spectra
Coming soonFree Fall
Drop objects with and without air resistance
Coming soonComposition and Resolution of Forces
Add forces with the parallelogram rule
Coming soonRelative Motion and River Crossing
Steer a boat across a flowing river
Coming soonWork-Energy Theorem
Push a block and compare work with kinetic energy
Coming soonCoulomb's Law
Change the charges and distance and measure the force
Coming soonParallel Plate Capacitor
Change plate area, gap and dielectric
Coming soonEMF and Internal Resistance
Load a battery and plot the terminal voltage
Coming soonForce on a Current-Carrying Wire
Change the current and field to move the wire
Coming soonMass Spectrometer
Separate ions by mass in a magnetic field
Coming soonCyclotron
Accelerate particles along a spiral path
Coming soonLenz's Law
Drop a magnet through a coil and find the current direction
Coming soonSelf-Inductance
Switch a circuit with a coil and watch the bulb lag
Coming soonLC Oscillation
Watch energy swap between capacitor and coil
Coming soonDamped and Forced Oscillation
Sweep the driving frequency to find resonance
Coming soonTotal Internal Reflection
Raise the angle past the critical angle
Coming soonSingle-Slit Diffraction
Narrow the slit and watch the pattern spread
Coming soonPolarization of Light
Rotate polarizers and measure the transmitted light
Coming soonElectromagnetic Spectrum
Compare wavelength, frequency and uses
Coming soonNuclear Fission and Fusion
Compare chain reactions and energy release
Coming soonRutherford Scattering
Fire alpha particles at gold foil
Coming soonHeat Engines and the First Law
Run a gas through a pressure-volume cycle
Coming soonBrownian Motion
Watch a pollen grain jostled by molecules
Coming soonMolecular Speed Distribution
Change the temperature and plot molecular speeds
Coming soonSpecial Relativity and Time Dilation
Speed up a light clock and compare times
Coming soonBlackbody Radiation
Change the temperature and watch the spectrum peak shift
Coming soonVernier Caliper and Micrometer
Read precise lengths and estimate measurement uncertainty
Coming soonAir Resistance and Terminal Velocity
Drop objects through air and watch the speed level off
Coming soonTorque and Rotational Motion
Apply forces to a wheel and compare torque and angular acceleration
Coming soonConservation of Angular Momentum
Pull masses inward and watch a spinning platform speed up
Coming soonBernoulli's Principle
Change the pipe width and flow speed and compare the pressure
Coming soonKirchhoff's Laws
Measure currents and voltages around a circuit with two loops
Coming soonAC Circuits and Resonance
Tune an RLC circuit and find the resonant frequency
Coming soonElectron Diffraction and Wave-Particle Duality
Change the accelerating voltage and watch the rings change size
University4/13
Coupled Oscillators and Normal Modes
Couple two pendulums with a spring and find the normal modes
Double Pendulum and Chaos
Start two pendulums a hair apart and watch them diverge
FreeParticle in a Box
Choose a quantum number and see the wavefunction and energy
Quantum Tunneling
Send a particle at a barrier and find the transmission
Coming soonPendulum Phase Space
Plot angle against angular velocity and find the separatrix
Coming soonEffective Potential and Orbits
Change energy and angular momentum and classify the orbit
Coming soonWave Packets and Group Velocity
Add waves and watch the packet move and spread
Coming soonQuantum Harmonic Oscillator
Compare quantum and classical probability densities
Coming soonHydrogen Atom Orbitals
Explore the shapes of s, p and d orbitals
Coming soonLorentz Transformations and Spacetime Diagrams
Boost frames and watch events move on a spacetime diagram
Coming soonIsing Model of a Magnet
Change the temperature and watch the magnetization vanish
Coming soonCarnot Cycle and Entropy
Run a heat engine on P-V and T-S diagrams
Coming soonDiffraction Gratings
Change the number of slits and see the peaks sharpen