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Physics (AS & A Level) · Oct / Nov 2018 · Paper 13 · Question 15

9702Energy conservation

Which statement about energy is not correct?

  1. AEnergy is never lost but it may be transferred between different forms.
  2. BIn an inelastic collision, the total energy is constant.
  3. CThe efficiency of a system is the ratio of the useful energy output to the total energy input.
  4. DWhen a machine does work, friction reduces the total energy.

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Correct answer: D. When a machine does work, friction reduces the total energy.

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