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KS3Physics · Years 7 to 9

Matter

Four lessons that start with questions. Weigh blocks and drop stones into water to find their density, heat a box of particles from solid to gas, watch a smoke speck being knocked about by air particles too small to see, race gases along a tube and watch ice melt on a balance. Get one wrong and the diagram shows you why. Prefer to read first? Every lesson has animated notes and a lab you can drag things around in.

Start lesson 29.1 →Daily 5

29.1

Density

Mass divided by volume, how to measure it, and why things float or sink.

Questions →Notes

29.2

Particles and density

How the particle model explains solids, liquids and gases, their densities, and why ice floats.

Questions →Notes

29.3

Brownian motion and diffusion

Evidence that particles move, and how gases and liquids spread and mix.

Questions →Notes

29.4

Energy in matter

Internal energy, expansion, changing state, and why mass is conserved.

Questions →Notes

Daily 5

Five quick diagram questions a day from this unit. The ones you get wrong come back sooner. Progress saves in this browser.

Start today's Daily 5 →

What this unit covers

Mapped to the KS3 national curriculum (Physics: matter).

Programme of study	Lesson
similarities and differences, including density differences, between solids, liquids and gases	29.1, 29.2
the particle model: arrangements, motion and closeness of particles explaining changes of state, shape and density; the anomaly of the ice-water transition	29.2
atoms and molecules as particles	29.2
Brownian motion in gases	29.3
diffusion in liquids and gases driven by differences in concentration	29.3
changes with temperature in motion and spacing of particles; internal energy stored in materials	29.4
conservation of material and of mass, and reversibility, in melting, freezing, evaporation, sublimation, condensation and dissolving	29.4
the difference between chemical and physical changes	29.4

Next at GCSE

P3 Particle model of matter → P3 Density →