Interactive Simulations

Projectile Motion SimulatorLaunch a projectile and watch its path, range and max height change live.

Pendulum Lab SimulatorExplore period, gravity and energy with a swinging pendulum.

Wave Interference SimulatorTwo wave sources create constructive and destructive interference patterns.

Circuit Lab (Ohm's Law)Wire two resistors in series or parallel and see voltage, current and power.

Forces & Friction SimulatorPush a block and explore Newton's laws, static and kinetic friction.

Orbital Motion & Gravity SimulatorLaunch a planet around a star and see circular, elliptical and escape orbits.

Light Refraction Simulator (Snell's Law)Bend a light ray between air, water, glass and diamond and find the critical angle.

Free Fall & Motion GraphsDrop or throw an object and watch position and velocity graphs build in real time.

Inclined Plane SimulatorTilt a ramp and see the weight split into components, with friction deciding if the block slides.

Spring & Hooke's Law SimulatorPull a mass on a spring and explore oscillation, period, damping and energy.

Collisions & Momentum LabCrash two carts together and compare momentum and kinetic energy before and after.

Gas Laws SimulatorChange temperature, volume and particles to see pressure follow PV = nRT.

Molarity & Dilution SimulatorDissolve a solute, see the concentration, and work out how much water to add to dilute it.

pH Scale SimulatorTest everyday liquids and see pH, hydrogen and hydroxide ions, and acid or base.

States of Matter SimulatorHeat and cool particles to see solid, liquid and gas behaviour and phase changes.

Acid-Base Lab (HCl & NaOH)Add HCl or NaOH to water and watch a live pH meter and indicator colour.

Molecule Polarity SimulatorChange atom electronegativity and see bond dipoles, the net dipole and molecule polarity.

Acid-Base Titration SimulatorAdd base drop by drop and watch the pH curve and indicator colour change.

Precipitation Reactions LabMix ionic solutions and see whether a solid precipitate forms, using solubility rules.

Heating Curve ExperimentAdd heat to ice and watch temperature versus time, including the flat melting and boiling plateaus.

Distillation Setup LabSeparate two liquids by boiling point in a virtual distillation apparatus.

Atom Builder (Isotopes & Ions)Build atoms from protons, neutrons and electrons and see the element, isotope and charge.

Bohr Model of HydrogenMake the electron jump between energy levels and see the photons absorbed and emitted.

Atomic Orbital Visualizer (s, p, d)See the shapes of s, p and d orbitals and rotate them in 3D.

Photoelectric Effect SimulatorShine light on a metal and see when electrons are emitted, and how fast.

Emission Spectrum ViewerSee the coloured line spectra of hydrogen, helium, neon, sodium and more.

Chemical Equation BalancerBalance chemical equations with coefficient buttons and a live atom count for both sides.

Reaction Rate SimulatorChange temperature and concentration and see how fast a reaction goes.

Collision Theory SimulatorWatch molecules collide and see why only fast, well-oriented collisions react.

Chemical Equilibrium SimulatorWatch the forward and reverse reactions balance and apply Le Chatelier's principle.

Catalyst & Activation EnergySee how a catalyst lowers the activation energy barrier and speeds a reaction.

Molecule BuilderAdd atoms and see which real molecule you have built, with a 3D model and name.

Molecule Shapes (VSEPR)Add bonds and lone pairs around a central atom and see the 3D shape and bond angles.

Ionic vs Covalent BondsChange electronegativity difference and watch bonds go from covalent to polar to ionic.

3D Molecule ViewerRotate, zoom and switch between ball-and-stick and space-filling models of common molecules.

Galvanic Cell (Voltaic Cell)Build a battery from two metals and watch electrons flow, with the cell voltage.

Electrolysis of WaterSplit water into hydrogen and oxygen and watch the bubbles collect in a 2:1 ratio.

Redox Tracker (Oxidation Numbers)Follow electrons in a redox reaction and see which species is oxidised and reduced.

Climate Chemistry: CO₂ & TemperatureChange CO₂ levels and see the greenhouse effect warm the planet.

Water Purification StagesRun dirty water through screening, coagulation, sedimentation, filtration and disinfection.

Ocean Acidification SimulatorSee how dissolved CO₂ lowers ocean pH and threatens shell-forming animals.

Natural Selection SimulatorWatch fur colour evolve in a bunny population as predators hunt and the environment changes.

Punnett Square CalculatorCross two parents and get genotype and phenotype ratios, for one trait or two.

Predator-Prey Population SimulatorWatch rabbit and fox populations rise and fall with the Lotka-Volterra model.

Diffusion & Osmosis SimulatorSee solute and water move across a membrane and find out why water follows the higher concentration.

Moon Phases SimulatorMove the Moon around its orbit and see what phase looks like from Earth.

Quadratic Function ExplorerDrag a, b and c to see the parabola, roots, vertex and discriminant change.

Unit Circle & Trig ExplorerDrag around the unit circle and watch sine, cosine and tangent trace their waves.

Linear Equation Explorer (y = mx + b)Change slope and intercept or drag two points to see the line, its equation and intercepts.

Probability Lab (Coins & Dice)Flip coins and roll dice thousands of times and compare results with theory.

Color Theory LabBuild colour harmonies on a wheel and check text contrast against WCAG.