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Play with Physics

Touch it. Watch the numbers move. Read the law.

Every law of physics as something you can drag — the scene, the live values and the formula move together. ICSE syllabus, built lesson by lesson.

All 174 Play With Physics lessons

Every lesson in the series, by class. Lessons marked with a link are free to play without an account.

Class 6

  • Everything is Stuff — Solids, liquids and gases — three dances of the same dots · Matter
  • Stuff Changes Costume — Melting, freezing, evaporating — matter's quick changes · Matter
  • Whose Hand? — Why the world needed standard units · Physical Quantities and Measurement
  • The Right Tool for the Job — Rulers, tapes, balances, clocks — measuring like a scientist · Physical Quantities and Measurement
  • Push and Pull — What forces do — move, stop, turn, squash · Force
  • Force Families — Muscular, magnetic, gravitational, frictional · Force
  • The Gripping Force — Friction — the force that rubs both ways · Force
  • Clever, Not Strong — What machines really do for us · Simple Machines
  • The Magic Plank — Levers — a rod, a pivot, and suddenly you're strong · Simple Machines
  • Rope Tricks — Pulleys — change the direction, share the load · Simple Machines
  • The Lazy Slope — The inclined plane — and its cousins, the wedge and the screw · Simple Machines
  • Light Walks Straight — Rectilinear propagation — and the shadows that prove it · Light
  • A Camera with No Lens — The pinhole camera — straight lines make pictures · Light
  • The Choosy Stone — Magnets and what they attract · Magnetism
  • Make a Magnet — From plain nail to magnet — and back again · Magnetism
  • The Earth Whisperer — The compass — a magnet that always knows north · Magnetism

Class 7

  • How Much Space? — Measuring volume — even of a lumpy stone · Physical Quantities and Measurement
  • Packed Tight or Loose? — Density — why iron sinks and wood floats · Physical Quantities and Measurement
  • Ways of Moving — Slide, spin, swing — the kinds of motion · Motion
  • Steady or Not? — Uniform motion, speed — and two trains to compare · Motion
  • The Mixed Journey — Distance vs the shortcut home · Motion
  • Stored and Moving — The two forms of mechanical energy · Energy
  • Energy Swaps Costumes — Conversions — and the total that never changes · Energy
  • The Perfect Bounce — Reflection — light's unbreakable rule · Light Energy
  • Your Backwards Twin — The plane mirror image and its flipped writing · Light Energy
  • Mixing Light — Red, green, blue — and why an apple needs red light to be red · Light Energy
  • Hot is Not Heat — Temperature, thermometers — and the lake that beats the teaspoon · Heat
  • Pass It or Block It — Conductors and insulators of heat · Heat
  • Three Roads for Heat — Conduction, convection, radiation · Heat
  • Black, White, Shiny — Absorbers, reflectors — and the thermos that knows all three roads · Heat
  • Everything That Sounds, Trembles — Vibrations — where every sound is born · Sound
  • Sound Needs a Messenger — The bell in the jar — no air, no sound · Sound
  • The Loop Rule — Circuits, conductors — and why the gap kills the glow · Electricity and Magnetism
  • Battery Language — Cells, torches and circuit symbols · Electricity and Magnetism
  • The Sure Test — Magnets: poles, repulsion and the invisible field · Electricity and Magnetism
  • The Magnet with a Switch — Electromagnets and the electric bell · Electricity and Magnetism

Class 8

  • The Particle Dance — Solid, liquid, gas — one box, three arrangements · Matter
  • The Great Escape — Melting, boiling, condensing — matter changes costume · Matter
  • The Vanishing Puddle — Evaporation — the quiet escape from the surface · Matter
  • How Crowded is Matter? — Density — measure, divide, identify · Physical Quantities and Measurement
  • Weigh It Underwater — The water test — density without a ruler · Physical Quantities and Measurement
  • The Float Rule — Density decides destiny — sink or swim · Physical Quantities and Measurement
  • The Turning Effect — Moment of force — the door-handle secret · Force and Pressure
  • The Pressure Point — P = F/A — sharp knives and wide straps · Force and Pressure
  • Deep Water Presses — Liquid pressure grows with depth · Force and Pressure
  • The Sky Presses — Atmospheric pressure — living at the bottom of an air ocean · Force and Pressure
  • Work Means Move — W = F × d — no motion, no work · Energy
  • Two Piggy Banks — Potential and kinetic energy · Energy
  • Energy Never Dies — Conversion and conservation — the pendulum's oath · Energy
  • The Bending Trick — Refraction — light changes lanes at every border · Light Energy
  • Shallow Lies — Bent sticks, lifted coins — refraction's illusions · Light Energy
  • The Curved Mirror — Meet the concave mirror: P, F and C · Light Energy
  • Images on the Axis — Slide the candle — the concave mirror answers · Light Energy
  • The Hidden Rainbow — Dispersion — white light was seven colours all along · Light Energy
  • Heat Changes Things — Expansion — matter needs room when warm · Heat Transfer
  • Density Shifts — Warm rises, cold sinks — and water's famous exception · Heat Transfer
  • Quiet vs Violent — Evaporation and boiling — the molecular story · Heat Transfer
  • Picture of a Sound — Amplitude, frequency, time period — reading the wave · Sound
  • High or Loud? — Pitch vs loudness — and a string to prove it · Sound
  • The Clingy Balloon — Static electricity — charges that sit still · Electricity
  • Power Reaches Home — From the generating station to your three wires · Electricity
  • The Meter Counts — Electrical energy, power and the units you pay for · Electricity
  • The Weakest Link — Fuses and safety — electricity's bodyguards · Electricity

Class 9

  • Why Units Rule — A number without a unit is a rumour · Measurements and Experimentation
  • Small, Smaller, Smallest — The length ladder — from femtometre to light year · Measurements and Experimentation
  • The Vernier Trick — Reading BETWEEN the millimetre marks · Measurements and Experimentation
  • One Hundredth of a Millimetre — The screw gauge — precision by rotation · Measurements and Experimentation
  • The Swinging Clock — The simple pendulum — and what the bob's mass does NOT do · Measurements and Experimentation
  • Moving or Not? — Rest, motion, and the six quantities that rule them · Motion in One Dimension
  • Path vs Shortcut — Distance and displacement — the odometer and the crow · Motion in One Dimension
  • How Fast, Which Way — Speed vs velocity — one number, two meanings · Motion in One Dimension
  • Speeding Up, Slowing Down — Acceleration, retardation and gravity's metronome · Motion in One Dimension
  • The Story in the Graph — s–t and v–t: slope and area tell everything · Motion in One Dimension
  • Three Golden Equations — v = u + at and friends — now stop the car · Motion in One Dimension
  • The Force Family — Contact and non-contact — how pushes reach things · Laws of Motion
  • The Lazy Universe — Newton's first law — inertia and the myth of the stored push · Laws of Motion
  • Momentum Matters — p = mv — mass in motion · Laws of Motion
  • F = ma — Newton's second law — the equation that runs the world · Laws of Motion
  • The Equal & Opposite Trap — Newton's third law — why the pairs never cancel · Laws of Motion
  • Gravity's Long Reach — Universal gravitation — mass vs weight, planet by planet · Laws of Motion
  • The Point of Pressure — P = F/A — why camels laugh at sand · Pressure in Fluids and Atmospheric Pressure
  • Deeper is Harder — Liquid pressure: P = hρg and the three-hole bottle · Pressure in Fluids and Atmospheric Pressure
  • Pascal's Superpower — Transmit the pressure, multiply the force · Pressure in Fluids and Atmospheric Pressure
  • The Ocean of Air — Atmospheric pressure — the crush you never feel · Pressure in Fluids and Atmospheric Pressure
  • Reading the Sky — Barometers — altitude, weather and 76 cm of mercury · Pressure in Fluids and Atmospheric Pressure
  • The Water Pushes Back — Upthrust — the force you feel in every pool · Upthrust in Fluids, Archimedes' Principle and Floatation
  • Eureka! — Archimedes catches a goldsmith — with bathwater · Upthrust in Fluids, Archimedes' Principle and Floatation
  • Dense Sense — Density and relative density — naming metals with a ratio · Upthrust in Fluids, Archimedes' Principle and Floatation
  • Float or Sink? — The principle of floatation — why iron ships don't drown · Upthrust in Fluids, Archimedes' Principle and Floatation
  • Floatation at Work — Submarines, icebergs, hydrometers — the principle employed · Upthrust in Fluids, Archimedes' Principle and Floatation
  • Heat is Motion — The kinetic story — and why the rails need a gap · Heat and Energy
  • Water Breaks the Rules — Anomalous expansion — the 4 °C secret that saves the fish · Heat and Energy
  • Energy Everywhere — Sources of energy — the renewable and the running-out · Heat and Energy
  • Downhill Energy — Degradation — every conversion pays a heat tax · Heat and Energy
  • The Warming Blanket — Greenhouse effect and global warming — the physics of the headline · Heat and Energy
  • The Law of the Bounce — ∠i = ∠r — and the 2θ mirror trick · Reflection of Light
  • Through the Looking Glass — The plane-mirror image — your equidistant, flipped twin · Reflection of Light
  • Hall of Mirrors — Two mirrors, an angle, and n = 360/θ − 1 · Reflection of Light
  • Curved Mirrors — P, F, C — the anatomy of a spherical mirror · Reflection of Light
  • Ray Diagrams that Work — The concave mirror image walk · Reflection of Light
  • Mirrors with Jobs — Concave or convex? Match the mirror to the mission · Reflection of Light
  • Everything that Sounds, Shakes — Sound is born from vibration and travels as a longitudinal wave · Propagation of Sound Waves
  • No Air, No Noise — The bell-jar experiment — sound needs a medium · Propagation of Sound Waves
  • What Changes the Speed — Temperature yes, humidity yes, pressure NO · Propagation of Sound Waves
  • Below and Beyond Hearing — Infrasound, ultrasound and the 20–20,000 window · Propagation of Sound Waves
  • The First Circuit — A loop, a switch, a bulb — the whole idea of electricity · Current Electricity
  • Speak Circuit — Symbols and diagrams — electricity's written language · Current Electricity
  • Which Way Does It Flow? — Conventional current vs the electrons' actual march · Current Electricity
  • Watts Wisely — Efficient use of energy — the bill as a physics exam · Current Electricity
  • The Reach of a Magnet — Induced magnetism — the nail that becomes a magnet · Magnetism
  • Invisible Lines — Field lines — mapping the magnet's territory · Magnetism
  • Earth, the Giant Magnet — Neutral points — where two fields cancel to zero · Magnetism
  • Magnets on Demand — The electromagnet — revision with a junkyard crane · Magnetism

Class 10

  • The Charge Parade — What actually flows in a wire — and how fast is a "lot"? · Current Electricity
  • Push of a Cell — e.m.f., terminal voltage and the volts that vanish inside · Current Electricity
  • Ohm's Playground — One straight line, one bent one — and the law between them · Current Electricity
  • Resistance Recipe — Length, thickness, material, heat — cook any resistance you want · Current Electricity
  • Split or Stack — Series vs parallel — and the current that never gets used up · Current Electricity
  • Watt's the Cost — Power, energy and the electricity bill you can now out-think · Current Electricity
  • Chapter Boss: Circuit Master — Everything from charge to the bill — prove the chapter is yours · Current Electricity
  • The Bending Ray — Snell's law — why light kinks at every surface · Refraction of Light at Plane Surfaces
  • Deeper than it Looks — Real depth, apparent depth, and the coin that floats up · Refraction of Light at Plane Surfaces
  • Through the Prism — Deviation, and the hunt for its minimum · Refraction of Light at Plane Surfaces
  • The Escape Angle — Critical angle — where refraction dies and reflection takes over · Refraction of Light at Plane Surfaces
  • Trapped Light — Put total internal reflection to work: the prism periscope · Refraction of Light at Plane Surfaces
  • Meet the Lens — Convex gathers, concave scatters — watch a parallel beam decide · Refraction through a Lens
  • Three Magic Rays — The only three rays you ever need to draw · Refraction through a Lens
  • The Image Walk — Drag the object from infinity to inside F — the whole chapter in one slider · Refraction through a Lens
  • Sign of the Times — The lens formula with its signs — where the numbers come from · Refraction through a Lens
  • Pocket Microscope — The magnifying glass — one lens, held exactly right · Refraction through a Lens
  • Slide vs Spin — One box, one push — two completely different motions · Force
  • The Turning Trick — Moment of force: why the spanner beats the fist · Force
  • The Couple — Two forces, zero push, pure turn · Force
  • Perfect Balance — The principle of moments — earn your equilibrium · Force
  • The Balancing Point & the Whirl — Centre of gravity, toppling — and the force that isn't there · Force
  • Work is Sneaky — W = FS cos θ — and the pull that does nothing · Work, Energy and Power
  • The Rate Race — Power: same work, different hurry · Work, Energy and Power
  • Energy the Shape-Shifter — Forms of energy and the chains between them · Work, Energy and Power
  • Stored vs Moving — Potential and kinetic — energy's two bank accounts · Work, Energy and Power
  • Nothing is Lost — Conservation of energy — the pendulum's promise · Work, Energy and Power
  • Chapter Boss: Loop Designer — Spend height like money — the conservation final · Work, Energy and Power
  • Why Machines? — MA, VR, efficiency — and the cheat that never works · Machines
  • Lever Law — Class I: the crowbar and its arms · Machines
  • Levers Everywhere — Class II, class III — and the levers in your own arm · Machines
  • The Pulley Puzzle — Fixed, movable, block & tackle — count the ropes · Machines
  • Chapter Boss: Machine Shop — Cheapest rig that survives — the contractor's final · Machines
  • The Deviation Dial — Why violet always loses the race through glass · Spectrum
  • Rainbow Factory — Dispersion, VIBGYOR, and Newton's second prism · Spectrum
  • Beyond the Rainbow — The electromagnetic spectrum: seven waves, one family · Spectrum
  • Why is the Sky Blue? — Scattering — the answer every child deserves · Spectrum
  • Bounce that Sound — Reflection of sound obeys light's rules · Sound
  • Echo Ranger — The 17-metre rule and measuring by ear · Sound
  • Everything has a Note — Natural vibrations — and the knobs that tune them · Sound
  • The Resonance Trap — When the push arrives exactly on time · Sound
  • Loud, High, Sweet — Loudness, pitch, quality — reading the waveform · Sound
  • Power Comes Home — From the station to your socket — why the volts climb before they fall · Household Circuits
  • Ring Around the House — Why every room is wired in parallel · Household Circuits
  • The Sacrificial Wire — Fuses and MCBs — the weakest link, on purpose · Household Circuits
  • Earth Saves — The third pin — a wire you hope never works · Household Circuits
  • The Compass Flinch — Oersted's accident — currents make magnetic fields · Electro-magnetism
  • Build an Electromagnet — Turns, current, core — a magnet with an OFF switch · Electro-magnetism
  • The Invisible Push — Force on a current in a field — Fleming's left hand · Electro-magnetism
  • Spin It: the DC Motor — Why the split ring is the whole invention · Electro-magnetism
  • Motion Makes Current — Faraday, Lenz, and the current that only exists while things CHANGE · Electro-magnetism
  • Voltage Elevator — The transformer — a.c.'s greatest trick · Electro-magnetism
  • Heat ≠ Hot — A cold lake outguns a boiling spoon · Calorimetry
  • Thermal Appetite — Specific heat capacity — why water tames climates · Calorimetry
  • The Mixing Court — Method of mixtures — heat lost equals heat gained · Calorimetry
  • The Plateau Mystery — Heating curves — where the thermometer stops and the state changes · Calorimetry
  • Hidden Heat — Latent heat — the 336 J/g nobody sees on a thermometer · Calorimetry
  • Inside the Nucleus — Protons, neutrons, isotopes — the atom's tiny heart · Radioactivity
  • The Three Rays — α, β, γ — three personalities from one unstable heart · Radioactivity
  • Nuclear Bookkeeping — Decay equations — A and Z must always balance · Radioactivity
  • Half-Life & Heavy Choices — Randomness with a rhythm — and what we owe the atom · Radioactivity
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