Use words from the list below to complete the sentences about work, energy, and power.
A heavy block is lifted vertically upwards at a constant speed. In order to calculate the work done against gravity, it is necessary to know the ______________________ and the ______________________.
To calculate the power required to lift the block, it is also necessary to know the ______________________.
An electric motor used to lift the block actually consumes more electrical energy than the gravitational potential energy gained by the block.
Suggest 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.