A trolley is pulled along a straight track. The table shows the constant pulling force during each part of the journey.
| Part | Force | Distance in direction of force |
|---|---|---|
| P | 18 N | 2.0 m |
| Q | 12 N | 3.0 m |
What is the total work done by the pulling force?
36 J36\ \mathrm{J}36 J
150 J150\ \mathrm{J}150 J
72 J72\ \mathrm{J}72 J
30 J30\ \mathrm{J}30 J
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.