An electric tow tractor completes movement A and movement B at steady speeds. During movement B, the tractor pulls with three times the force used during movement A and travels one-quarter of the distance. The input power and efficiency have the same constant values for both movements.
Which statement compares movement B with movement A?
The useful work done and the time taken are both three times as great.
The useful work done and the time taken are both one-quarter as great.
The useful work done is three-quarters as great, but the time taken is unchanged.
The useful work done and the time taken are both three-quarters as great.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.