A child slides down a rough playground slide. They start from rest at the top of the slide and reach the bottom with less kinetic energy than the gravitational potential energy they had at the start.
What happens to this 'lost' energy?
It is converted into chemical energy in the child's body.
It is converted into internal (heat) energy of the slide and the child, and sound.
It is destroyed by the force of friction between the child and the slide.
It is destroyed as the child moves down 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.