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

DifficultyAll Level 1 Level 2 Level 3 Level 4 Level 5

1
A horizontal force of $20\text{ N}$ pulls a box a distance of $5\text{ m}$ across a horizontal floor, in the direction of the force. Find the work done by the force. (2 marks)
Level 1 · 2 marksTry it
2
A constant horizontal force of $45\text{ N}$ pushes a trolley $8\text{ m}$ across a smooth horizontal floor.

Find the work done by the force. (2 marks)
Level 1 · 2 marksTry it
3
A force of $30\text{ N}$ acts on a box at an angle of $60^\circ$ above the horizontal and pulls it a distance of $8\text{ m}$ along horizontal ground. Find the work done by the force. (3 marks)
Level 2 · 3 marksTry it
4
A crate of mass $12\text{ kg}$ is raised vertically at constant speed through a height of $3\text{ m}$ . Taking $g = 10\text{ m s}^{-2}$ , find the work done against gravity. (3 marks)
Level 2 · 3 marksTry it
5
A car travels $200\text{ m}$ along a straight level road against a constant total resistance of $350\text{ N}$ . Find the work done against the resistance. (2 marks)
Level 2 · 2 marksTry it

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