An investigator measures the energy transfers taking place inside a closed system.
Which statement correctly describes the total energy of this closed system?
The total energy decreases over time as energy is dissipated.
The total energy remains constant, even though it can be transferred between different stores.
The total energy increases when potential energy is transferred to kinetic energy.
The total energy varies depending on the efficiency of the devices inside the system.
82 exam-style questions on Edexcel GCSE Physics 3.1 Energy stores and calculations. Each one has a worked solution and a mark scheme showing where the marks go.