A box of mass 5.0 kg is pushed at a constant speed up a slope. The pushing force is 40 N along the slope.
The box moves 4.0 m along the slope and rises 2.0 m vertically.
Gravitational field strength = 10 N/kg.
How much energy is transferred to thermal stores by friction?
60 J60\ \text{J}60 J
100 J100\ \text{J}100 J
160 J160\ \text{J}160 J
260 J260\ \text{J}260 J
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.