A battery transfers 240 J to a motor. The kinetic energy of its moving parts increases by 65 J. All the remaining energy increases thermal energy stores. What is this increase?
240 J240\ \mathrm{J}240 J
175 J175\ \mathrm{J}175 J
305 J305\ \mathrm{J}305 J
65 J65\ \mathrm{J}65 J
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.