A-level · Work, energy & power

Kinetic and potential energyExam-style questions

Kinetic energy ½mv² and gravitational potential energy mgh, the work–energy principle (the work done by the resultant force equals the change in kinetic energy), and conservation of mechanical energy — including motion along a smooth curved path, where only the overall energy change matters.

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15 questions · A Level level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 1Level 3Level 4Level 5
  1. 1
    A skier of mass 70 kg70\text{ kg} starts from rest and descends a run whose end is 40 m40\text{ m} below its start. The total work done against resistive forces during the run is 16 000 J16\,000\text{ J}. Take g=10 m s−2g = 10\text{ m s}^{-2}.

    Find the skier's speed at the end of the run, giving your answer to 33 significant figures. (5 marks)
    Level 5 · 5 marksTry it