A-level · Moments

Moments of forcesExam-style questions

The moment (turning effect) of a force as force × perpendicular distance from the pivot, measured clockwise or anticlockwise, in newton-metres — including forces acting at an angle to a rod.

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

DifficultyAll Level 2 Level 3 Level 4 Level 5

1
A force of $25$ N acts at a perpendicular distance of $0.4$ m from a pivot. Find its moment about the pivot.
Level 2 · 2 marksTry it
2
A light rod is pivoted at its centre. A $6$ N force acts downward $2$ m to the left of the pivot, and an $8$ N force acts downward $1.5$ m to the right. Find the resultant moment about the pivot.
Level 2 · 2 marksTry it
3
A force of $15$ N acts at a perpendicular distance of $3$ m from a pivot, turning it clockwise. State the moment of the force.
Level 2 · 2 marksTry it
4
A light rod is pivoted at a point $O$ . A force of $8$ N acts vertically downward at a point $1.5$ m to the left of $O$ , and a force $F$ acts vertically downward $2$ m to the right of $O$ . The rod is in equilibrium.

Find $F$ . (3 marks)
Level 2 · 3 marksTry it
5
A force of $20$ N acts at the end of a rod $3$ m long, at $30^\circ$ to the rod. Find its moment about the other end.
Level 3 · 2 marksTry it

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