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1.7 Energy, work and power

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Question 51

An operator of a crane on a construction site needs to lift a heavy concrete block from the ground to one of the floors of a building.

Which of the following actions requires the crane to do the least amount of work?

A

lifting the block quickly to the top floor

B

lifting the block slowly to the top floor

C

lifting the block to the middle floor first, then lifting it to the top floor

D

lifting the block to the middle floor instead of to the top floor

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

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.

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