Lesson 3.2.3

3.2.3 Equilibrium Quiz: OCR Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson 3.2.3, Equilibrium: 20 multiple choice questions for the OCR Physics (H156), Unit 2: Forces and motion, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. What is the formula for calculating the moment of a force about a pivot?

    • Force x distance
    • Force / distance
    • Force x acceleration
    • Mass x distance

  2. What pair of forces forms a couple on a rigid body?

    • Equal and opposite
    • Equal and parallel
    • Unequal and opposite
    • Perpendicular and equal

  3. How is the torque of a couple calculated using force F and separation distance d?

    • 2F x d
    • F x d
    • F / d
    • F + d

  4. For an object in rotational equilibrium, total clockwise moments equal total:

    • Linear momentum
    • Upward forces
    • Anticlockwise moments
    • Resultant forces

  5. Where is the centre of gravity located for a uniform regular object?

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

  6. When drawn vectorially head-to-tail, three coplanar forces in equilibrium form a:

    • Straight line
    • Closed triangle
    • Right angle
    • Open polygon

  7. Which conditions are both required for an object to be in complete equilibrium?

    • Constant acceleration
    • Zero force only
    • Zero force, torque
    • Zero torque only

  8. A 5 N force acts at a perpendicular distance of 0.4 m from a pivot. What is the moment about the pivot?

    • 2 N m
    • 5.4 N m
    • 0.08 N m
    • 12.5 N m

  9. A 60 N load hangs 0.3 m from a pivot. What force, 0.5 m from the pivot on the other side, balances it?

    • 36 N
    • 60 N
    • 18 N
    • 100 N

  10. A uniform plank of weight 40 N and length 2 m is supported at one end, with its centre of gravity at its middle. What is the torque about the support?

    • 40 N m
    • 80 N m
    • 20 N m
    • 2 N m

  11. A couple consists of two forces of 6 N separated by 0.25 m. What is the torque of the couple?

    • 0.04 N m
    • 24 N m
    • 3.0 N m
    • 1.5 N m

  12. Three coplanar forces of 3 N, 4 N and 5 N are in equilibrium. Which two are perpendicular?

    • 3 N and 4 N
    • All three forces
    • 4 N and 5 N
    • 3 N and 5 N

  13. Where must a pivot be placed to balance an unloaded uniform metre rule?

    • 0.25 m
    • 0.50 m
    • 1.00 m
    • 0.75 m

  14. A 10 N force acts at 30° to the rod at its end, the rod being 0.5 m long. What is the moment about the other end where the rod is pivoted?

    • 2.5 N m
    • 5 N m
    • 4.3 N m
    • 8.7 N m

  15. A 200 N load acts at 0.2 m from a pivot. What force at 0.4 m on the other side of the pivot balances it?

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

  16. A uniform beam of length 4.0 m, weight 200 N, is pivoted 1.0 m from its left end. A 100 N load hangs from the left end. What is the net moment about the pivot?

    • 300 N m clockwise
    • 0 N m
    • 100 N m anticlockwise
    • 100 N m clockwise

  17. A hinged horizontal beam of weight 50 N and length 2 m is held by a rope at 30° to the beam at its far end. What is the tension?

    • 50 N
    • 25 N
    • 86.6 N
    • 100 N

  18. A seesaw has 300 N at 1.5 m from the pivot on one side. A 200 N child balances it on the other side. At what distance from the pivot does the child sit?

    • 3.0 m
    • 0.75 m
    • 1.0 m
    • 2.25 m

  19. A 2 N weight hangs 0.2 m from a pivot and a 5 N weight hangs 0.3 m from the pivot, both on the same side. What is the total moment about the pivot?

    • 1.1 N m
    • 1.9 N m
    • 0.9 N m
    • 3.5 N m

  20. A 2.0 N weight hangs 0.30 m to the left of a pivot. How far to the right of the pivot must a 1.5 N weight hang to balance it?

    • 0.45 m
    • 0.30 m
    • 0.20 m
    • 0.40 m

All OCR Physics quizzes