A cyclist rides from the bottom of a hill to the top, gaining 15 000 J15\,000\text{ J}15000 J of gravitational potential energy. She then coasts down the hill without pedaling. At the bottom of the hill, her kinetic energy is 4 500 J4\,500\text{ J}4500 J. How much energy was converted into thermal energy and sound energy as the cyclist coasted down the hill?
4 500 J4\,500\text{ J}4500 J
10 500 J10\,500\text{ J}10500 J
15 000 J15\,000\text{ J}15000 J
19 500 J19\,500\text{ J}19500 J
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.