A pendulum swings down from a raised position. The system includes the pendulum and its surroundings.
The table shows the energy in different stores at four moments as the pendulum swings down.
| Moment | Gravitational potential store (J) | Kinetic store (J) | Increase in thermal stores (J) |
|---|---|---|---|
| 1 | 9.0 | 3.0 | 0.0 |
| 2 | 7.0 | 4.9 | 0.1 |
| 3 | 4.0 | 7.8 | 0.2 |
| 4 | 1.0 | 10.7 | 0.3 |
Explain how the data show that energy is conserved as the pendulum swings.
104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.