The table shows changes in a closed system. These are the only energy stores that change.
| Energy store | Initial energy | Final energy |
|---|---|---|
| Chemical | 900 J | 540 J |
| Kinetic | 40 J | 130 J |
| Gravitational | 60 J | 180 J |
| Thermal | 500 J | XXX |
What is XXX?
860 J860\ \mathrm{J}860 J
650 J650\ \mathrm{J}650 J
1070 J1070\ \mathrm{J}1070 J
150 J150\ \mathrm{J}150 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.