A student gives a loaded trolley a push along a level surface and then releases it. From the instant it is released, the system consists of the trolley, the surface and the surrounding air. No energy enters or leaves the system. The only energy changes being considered are shown in the table.
| Stage | Energy in the trolley's kinetic store in J | Energy transferred to the thermal stores of the surface and air since release in J |
|---|---|---|
| Just after release | 36 | 0 |
| Later | 14 | 22 |
Explain what the data show about the conservation and dissipation of energy as the trolley slows down.
The trolley continues to slow until the energy in its kinetic store is 0 J.
Calculate the total energy transferred to the thermal stores from the instant the trolley was released until it stops.
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.