A student sets up a swinging pendulum. The pendulum and the air around it are treated as a closed system.
Which statement must be true for this to be a closed system?
No energy is transferred to thermal stores within the system
The energy in the kinetic store of the pendulum stays the same
No energy is transferred into or out of the system
No energy is transferred between stores within the system
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.