Use terms from the list below to complete the sentences about work, energy, and power.
A crane lifts a heavy shipping container vertically. In order to calculate the work done on the container, it is necessary to know the ____________________ and the ____________________.
To determine the average power developed, it is also necessary to know the ____________________.
The electric motor of the crane actually consumes more electrical energy than the useful work done on the container. Explain why this is the case.
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.