A child slides down a playground slide. At the bottom of the slide, the child has less kinetic energy than the gravitational potential energy they had at the top.
What happens to the 'lost' energy?
It is destroyed by the frictional force acting on the child.
It is converted into internal (thermal) energy and sound.
It is stored as chemical energy within the slide.
It is destroyed when the child reaches the bottom of the slide.
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.