A student uses a force meter with a zero error. The same constant pulling force is used in two trials. Work done is calculated independently using an energy sensor.
| Trial | Distance | Work done |
|---|---|---|
| P | 0.40 m | 1.2 J |
| Q | 0.90 m | 2.7 J |
The force meter reads 3.4 N during both trials. What does the force meter read when no force is applied?
6.4 N6.4\ \mathrm{N}6.4 N
0.4 N0.4\ \mathrm{N}0.4 N
3.0 N3.0\ \mathrm{N}3.0 N
1.5 N1.5\ \mathrm{N}1.5 N
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.