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.
151 exam-style questions on CIE IGCSE Physics 2.1.2a Particle structure and motion in solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.