Momentum, impulse and collisionsAQA A-Level Physics: Mind map

Exam questions on Momentum, impulse and collisions

1. On a level laboratory track, a trolley of mass 0.80 kg moves at 1.5 m s⁻¹ towards a stationary trolley of mass 0.40 kg. The trolleys collide and stick together. Friction is negligible.
   Show that the collision is inelastic.2 marks
2. A footballer kicks a stationary ball of mass 0.43 kg. The ball leaves the boot at 24 m s⁻¹ in a straight line. The boot and ball are in contact for 8.0 ms.
   The footballer kicks a softer ball of the same mass so that it also leaves at 24 m s⁻¹, but the contact time is 16 ms. State and explain what happens to the average force.2 marks
3. A courier packs a camera of mass 1.5 kg in a box lined with foam. The box is dropped and lands on a hard floor, so that the camera is travelling at 4.0 m s⁻¹ just before it is brought to rest by the foam in 0.020 s. Assume the average resultant force on the camera is much greater than its weight and that the camera does not rebound.
   Explain how the foam lining reduces the risk of the camera being damaged when the box lands.3 marks