A winch pulls a rescue capsule horizontally along a rough guide rail at a constant speed. The winch force and distance travelled in each section are shown in the table.
| Section | Winch force | Distance travelled |
|---|---|---|
| 1 | 120 N | 30 m |
| 2 | 180 N | 15 m |
A technician claims that more work is done on the capsule in section 2 because the winch force is greater.
Use the data to determine whether the technician is correct.
The guide rail in section 2 is replaced with one that produces less friction. The force needed to pull the capsule at the same constant speed is now 60 N.
A technician states that this change reduces the energy transferred to thermal stores during section 2 by two-thirds.
Determine whether the technician's statement is correct.
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.