A-level · Work, energy & power

Work done by a forceExam-style questions

The work done by a constant force, W = Fd when the force is along the motion and W = Fd cosθ when it acts at an angle, together with work done against gravity and against resistance — and the sign convention that makes a force opposing the motion do negative work.

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

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    A force of 30 N30\text{ N} acts on a box at an angle of 60∘60^\circ above the horizontal and pulls it a distance of 8 m8\text{ m} along horizontal ground. Find the work done by the force. (3 marks)60°30 N
    Level 2 · 3 marksTry it
  2. 2
    A crate of mass 12 kg12\text{ kg} is raised vertically at constant speed through a height of 3 m3\text{ m}. Taking g=10 m s−2g = 10\text{ m s}^{-2}, find the work done against gravity. (3 marks)
    Level 2 · 3 marksTry it
  3. 3
    A car travels 200 m200\text{ m} along a straight level road against a constant total resistance of 350 N350\text{ N}. Find the work done against the resistance. (2 marks)
    Level 2 · 2 marksTry it
  4. 4
    A rope pulls a crate 12 m12\text{ m} across a horizontal floor. The rope is inclined at 30∘30^{\circ} above the horizontal and the tension in it is 50 N50\text{ N}.

    Find the work done by the tension, giving your answer in exact form and to 33 significant figures. (3 marks)
    Level 2 · 3 marksTry it