Two electric winches, winch P and winch Q, are used to raise loads on a building site. Table shows data for each winch. The gravitational field strength is 9.8 N/kg.
Table: Data for the load raised by winch P and by winch Q
| Winch | Mass of load in kg | Vertical height in m | Time taken in s |
|---|---|---|---|
| P | 150 | 12 | 20 |
| Q | 250 | 9.0 | 50 |
Calculate the power output of winch P.
The power output of winch Q is 441 W. Compare the power outputs of the two winches.
Winch Q raises a larger mass than winch P. Explain why winch Q still has the smaller power output.
40 exam-style questions on AQA GCSE Physics 1.1 Energy changes in a system, and the ways energy is stored before and after such changes, covering 1.1.1 Energy stores and systems, 1.1.2 Changes in energy, 1.1.3 Energy changes in systems, and 1.1.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.