A motor moves the same drawer runner backwards and forwards in two tests. The runner starts at the same temperature and moves through the same total distance in each test.
| Test | Average frictional force |
|---|---|
| R | 45 N |
| S | 25 N |
The temperature rise of the runner is greater in test R than in test S.
Explain why the temperature rise is greater in test R. Refer to the work done in your answer.
The total distance moved by the runner in each test is 14 m.
Calculate the energy transferred to thermal energy stores by the work done against friction in test R.
113 exam-style questions on AQA GCSE Physics 5.2 Work done and energy transfer, covering 5.2 Work done and energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.