A soft rubber ball of mass 0.40 kg is dropped, in a vacuum, from a height of 3.6 m onto a hard floor. The ball then bounces. Take the acceleration of free fall to be g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2.
State the main energy transfers taking place when:
(i) the ball is falling,
(ii) the ball is in contact with the floor and is being compressed,
(iii) the ball is expanding back to its original shape and starts rising from the floor.
Calculate the speed with which the ball hits the floor.
After rebounding, the ball rises to a maximum height of 2.7 m. Suggest why the height to which the ball rises is less than the height from which it was dropped.
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.