Lesson 3.2.1

3.2.1 Dynamics Quiz: OCR Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson 3.2.1, Dynamics: 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 acceleration does a resultant force of 1 N give to a 1 kg mass?

    • 1 m s^-2
    • 9.81 m s^-2
    • 10 m s^-2
    • 0.1 m s^-2

  2. The weight of an object of mass m in a gravitational field of strength g is:

    • W = mg
    • W = m^2 g
    • W = mv
    • W = m/g

  3. In which direction does the tension force act on an object attached to a stretched string?

    • Towards the object
    • Away from object
    • Perpendicular to string
    • Vertically downwards

  4. In which direction does the normal contact force act relative to the contact surface?

    • Perpendicular to surface
    • Parallel to surface
    • Along the friction
    • Vertically upwards

  5. In which direction does the upthrust force act on an object submerged in a fluid?

    • Perpendicular to surface
    • Vertically downwards
    • Vertically upwards
    • Parallel to flow

  6. Which forces are displayed on a free-body diagram of a single object?

    • All internal forces
    • Forces acting on it
    • Forces exerted by it
    • Only frictional forces

  7. In which direction does friction act between two contacting surfaces?

    • Opposes relative motion
    • In motion direction
    • Perpendicular to surface
    • Parallel to weight

  8. A net force of 12 N acts on a 3 kg object. What is its acceleration?

    • 15 m s^-2
    • 4 m s^-2
    • 0.25 m s^-2
    • 36 m s^-2

  9. The weight of a 5 kg mass at a location where g = 9.8 m s^-2 is:

    • 49 N
    • 0.51 N
    • 9.8 N
    • 5.0 N

  10. Two horizontal forces act on a 2 kg block: 10 N east and 4 N west. What is its acceleration?

    • 6 m s^-2 east
    • 5 m s^-2 west
    • 7 m s^-2 east
    • 3 m s^-2 east

  11. A 60 kg lift is pulled upwards by a cable with tension 700 N. Using g = 9.8 m s^-2, what is the acceleration of the lift?

    • 1.9 m s^-2 upwards
    • 1.9 m s^-2 downwards
    • 11.7 m s^-2 upwards
    • 9.8 m s^-2 upwards

  12. A 20 N force acts at 30° above the horizontal on a block on a horizontal surface. What is the horizontal component of this force?

    • 17.3 N
    • 34.6 N
    • 10 N
    • 20 N

  13. A 5 kg block rests on a smooth plane inclined at 30°. Using g = 9.8 m s^-2, what is its acceleration down the slope?

    • 9.8 m s^-2
    • 4.9 m s^-2
    • 2.5 m s^-2
    • 8.5 m s^-2

  14. A 70 kg person stands in a lift accelerating upwards at 2 m s^-2. Using g = 9.8 m s^-2, what is the normal contact force from the floor?

    • 546 N
    • 140 N
    • 686 N
    • 826 N

  15. A 2 kg block is pulled at constant velocity along a rough horizontal floor by a horizontal force of 6 N. What is the friction force?

    • 19.6 N
    • 12 N
    • 6 N
    • 0 N

  16. A 3 kg block hangs from a string over a frictionless pulley and is connected to a 2 kg block resting on a smooth table. Using g = 9.8 m s^-2, what is the acceleration of the system?

    • 2.9 m s^-2
    • 9.8 m s^-2
    • 5.9 m s^-2
    • 3.0 m s^-2

  17. A 5 kg block is pulled up a smooth 30 degree slope by a force parallel to the slope, producing an acceleration of 1 m s^-2 up the slope. Using g = 9.8 m s^-2, what is the force?

    • 49 N
    • 29.5 N
    • 24.5 N
    • 4.9 N

  18. A 1.5 kg block on a rough floor is pulled by a 10 N force at 60° above the horizontal. Friction is 2 N. What is the horizontal acceleration?

    • 5.0 m s^-2
    • 3.3 m s^-2
    • 2.0 m s^-2
    • 6.7 m s^-2

  19. What forms a Newton's third law pair with a resting book's weight force?

    • Earth's pull on book
    • Normal contact force
    • Book's pull on Earth
    • Table's push on book

  20. A 50 kg person stands on bathroom scales in a lift accelerating downwards at 3 m s^-2. Using g = 9.8 m s^-2, what is the scale reading?

    • 150 N
    • 490 N
    • 340 N
    • 640 N

All OCR Physics quizzes