A ball is dropped onto the floor and bounces. Each bounce is lower than the one before.
Which statement explains this?
Energy is used up each time the ball hits the floor
Energy is destroyed by air resistance as the ball falls
The gravitational field strength increases after each bounce
Energy is transferred to the thermal store of the surroundings
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.