Physics

Physics

Why the world behaves the way it does: from falling to flying.

Topics build on each other, but feel free to explore anywhere.

Measuring & motion

8 topics · 78 exercises

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1Measuring & units10 exercises 2Speed10 exercises 3Acceleration10 exercises 4Forces10 exercises 5Inertia & Newton's laws10 exercises 6Gravity & free fall10 exercises 7Friction10 exercises 8Throws & trajectories8 exercises

Force, work & energy

7 topics · 70 exercises

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1Levers & simple machines10 exercises 2Work & power10 exercises 3Spring force10 exercises 4Energy10 exercises 5Energy sources & the power mix10 exercises 6The physics of cycling10 exercises 7Momentum & collisions10 exercises

Heat & matter

9 topics · 88 exercises

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1Temperature & heat10 exercises 2States of matter10 exercises 3How heat travels10 exercises 4Density: floating & sinking10 exercises 5Buoyancy10 exercises 6Pressure10 exercises 7Air pressure & weather10 exercises 8Why planes fly10 exercises 9Thermal expansion8 exercises

Sound & light

9 topics · 88 exercises

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1Oscillations & pendulums10 exercises 2Sound10 exercises 3Echo & the speed of sound10 exercises 4Tones & music10 exercises 5Light & shadow10 exercises 6Mirrors & lenses10 exercises 7Colours & mixing light10 exercises 8The Doppler effect8 exercises 9Invisible light: the spectrum10 exercises

Electricity & magnetism

6 topics · 60 exercises

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1Electric current10 exercises 2Series & parallel circuits10 exercises 3Electric power10 exercises 4Static electricity10 exercises 5Magnets10 exercises 6Electromagnets & motors10 exercises

Space & modern physics

6 topics · 60 exercises

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1Sun, Earth and Moon10 exercises 2Our solar system10 exercises 3Orbits & satellites10 exercises 4Stars & light years10 exercises 5From atoms to the universe10 exercises 6Radioactivity & half-life10 exercises