Gas molecules colliding with the inner walls of an inflated balloon exert pressure on the walls. Which statement about these molecules and the pressure they exert is correct?
They experience a change in momentum, which results in a force on the wall, leading to a pressure equal to forcearea\frac{\text{force}}{\text{area}}areaforce.
They experience a change in momentum, which results in a force on the wall, leading to a pressure equal to force×area\text{force} \times \text{area}force×area.
They experience a change in force, which results in a change in momentum, leading to a pressure equal to momentumarea\frac{\text{momentum}}{\text{area}}areamomentum.
They experience a change in kinetic energy, which results in a force on the wall, leading to a pressure equal to forcearea\frac{\text{force}}{\text{area}}areaforce.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.