A motorised winch drags boats on wheeled cradles across a level boatyard at steady speed. The winch has the same total input power and the same efficiency for two pulls. For pull B, the steady pulling force is half that for pull A, but the boat is dragged three times as far. Which statement correctly describes the useful work done and the time taken for pull B, compared with pull A?
The useful work is greater and the time taken is longer.
The useful work is greater and the time taken is shorter.
The useful work is smaller and the time taken is longer.
The useful work is smaller and the time taken is shorter.
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.