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1.7 Energy, work and power

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Question 76

Four athletes are training using chest expanders made of identical springs, each of stiffness kkk. The details of their training configurations are as follows:

  • Athlete A stretches one spring by 0.50 m.
  • Athlete B stretches two springs in parallel by 0.40 m each.
  • Athlete C stretches three springs in parallel by 0.30 m each.
  • Athlete D stretches two springs in parallel by 0.50 m each.

Which athlete does the most work?

A

Athlete A

B

Athlete B

C

Athlete C

D

Athlete D

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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