Energy is stored inside a system by the particles that make up the system. Which of these is the internal energy of a system?
The total potential energy of all the particles in the system
The total kinetic energy of all the particles in the system
The total kinetic energy and potential energy of all the particles
The average kinetic energy of one particle inside the system
40 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.