The front wheel of an exercise bike is spinning. A brake pad is pressed against the rim of the wheel, and the wheel slows down. The brake pad and the rim become warmer.
A student says that no work is done by the brake because the wheel is slowing down.
Explain why the student is wrong and why the brake pad and the rim become warmer.
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.