A bath contains 80 kg of water at 40 ∘C40\ ^\circ\text{C}40 ∘C. A cup contains 0.20 kg of water at 100 ∘C100\ ^\circ\text{C}100 ∘C.
Explain why the water in the bath has a greater internal energy than the water in the cup.
The cup of water is left on a table and cools down.
Describe what happens to the internal energy of the water in the cup as it cools.
Give one way of reducing the rate at which the water in the cup cools down.
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.