A ball is dropped onto a hard floor. Each time the ball bounces it rises to a lower height than before. Which explains why the ball rises to a lower height?
some energy in the kinetic energy store of the ball is destroyed at each bounce
the gravitational field strength acting on the ball decreases at each bounce
some energy is transferred to the thermal energy stores of the ball and floor
the mass of the ball decreases slightly each time the ball hits the hard floor
40 exam-style questions on AQA GCSE Physics 1.1 Energy changes in a system, and the ways energy is stored before and after such changes, covering 1.1.1 Energy stores and systems, 1.1.2 Changes in energy, 1.1.3 Energy changes in systems, and 1.1.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.