Lesson 3.4.1.2

3.4.1.2 Moments Quiz: AQA Physics, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.1.2, Moments: 20 multiple choice questions for the AQA Physics (7408), Unit 4: Mechanics and materials, written with Revision Ninja.

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The 20 questions

  1. What distance is multiplied by force to calculate the moment about a point?

    • Perpendicular distance
    • Total path length
    • Vertical height
    • Direct parallel distance

  2. What term describes a pair of equal and opposite coplanar forces acting along different lines?

    • Equilibrium pair
    • Moment arm
    • Couple
    • Vector component

  3. What distance is multiplied by one force to calculate the moment of a couple?

    • Distance to pivot
    • Total displacement
    • Mass of object
    • Distance between forces

  4. For an object in rotational equilibrium, what equals the sum of clockwise moments?

    • Sum of vertical forces
    • Total resultant force
    • Sum of anticlockwise moments
    • Total applied torque

  5. Where is the centre of mass located for a uniform regular solid?

    • Top surface
    • Geometric centre
    • Lowest point
    • Outer edge

  6. What is the unit of moment?

    • kg m
    • N/m
    • N m
    • N s

  7. A force of 4.0 N acts at a perpendicular distance of 0.30 m from a pivot. What is its moment?

    • 1.2 N m
    • 0.075 N m
    • 13 N m
    • 4.3 N m

  8. A seesaw has a 300 N load 1.0 m from the pivot. What distance from the pivot balances a 200 N load on the other side?

    • 1.5 m
    • 0.5 m
    • 2.0 m
    • 0.67 m

  9. A uniform beam of weight 100 N and length 4 m is pivoted at its left end. What is the moment of its weight about the pivot?

    • 50 N m
    • 200 N m
    • 100 N m
    • 400 N m

  10. Two 5 N forces act in opposite directions 0.2 m apart as a couple. What is the moment?

    • 1.0 N m
    • 0.04 N m
    • 10 N m
    • 2.5 N m

  11. What is the resultant force of a couple?

    • F
    • F/2
    • 2F
    • Zero

  12. A 40 N force acts at 30 degrees to a spanner of length 0.25 m. What is the moment about the bolt?

    • 10 N m
    • 2.5 N m
    • 8.7 N m
    • 5.0 N m

  13. Two masses of 2 kg at 0 m and 3 kg at 1 m lie along a line. Where is their combined centre of mass?

    • 0.4 m
    • 0.6 m
    • 1.0 m
    • 0.5 m

  14. A 0.5 kg mass hangs 0.3 m left of the pivot on a uniform rule. What mass hung 0.3 m right of the pivot balances it?

    • 0.25 kg
    • 0.15 kg
    • 0.5 kg
    • 1.0 kg

  15. A 600 N person sits 1.5 m from the pivot of a seesaw. A 900 N person is on the other side. At what distance do they balance?

    • 0.67 m
    • 1.0 m
    • 2.25 m
    • 1.5 m

  16. What distance from the pivot is used when calculating a force's moment?

    • Total displacement
    • Parallel distance
    • Perpendicular distance
    • Direct distance

  17. Where must the line of action of weight fall for an object to be stable?

    • Above the pivot
    • Within the base
    • Outside the base
    • At the edge

  18. What is the net moment acting on a body in equilibrium about any pivot?

    • Equal to weight
    • Maximum value
    • Infinite
    • Zero

  19. A 2.0 N weight hangs 0.2 m left of a pivot. What distance right of the pivot must a 0.5 N weight hang to balance it?

    • 0.2 m
    • 0.08 m
    • 0.5 m
    • 0.8 m

  20. Moment is defined as force multiplied by which distance to the line of action?

    • Parallel distance
    • Vertical distance
    • Total path length
    • Perpendicular distance

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