An air-filled exercise ball is resting on the floor. Which outcome at a vertical patch on the side of the ball is predicted by the particle model, and what causes it?
The patch is pushed horizontally outwards because the particles repel the side without touching it.
The patch experiences no force because collisions in different directions cancel one another completely.
The patch is pushed horizontally outwards because randomly moving particles collide with the side.
The patch is pushed vertically upwards because particles rebound from the bottom of the ball first.
108 exam-style questions on Edexcel GCSE Physics 14.3 Gas pressure and temperature, covering 14.3.1 Gas pressure and particle motion, 14.3.2 Temperature and pressure at constant volume, 14.3.3 Absolute zero and the kelvin scale, 14.3.4 Compressing and expanding gases, 14.3.5 Volume and pressure at constant temperature, and 14.3.6 Doing work on a gas. Each one has a worked solution and a mark scheme showing where the marks go.