Lesson 3.03q

3.03q Friction Quiz: OCR Maths, Unit 18

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson 3.03q, Friction: 20 multiple choice questions for the OCR Maths (H240), Unit 18: Forces and Newton's Laws, 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. In which direction relative to motion does a frictional force always act?

    • Parallel to motion
    • Opposing motion
    • Perpendicular to surface
    • Towards normal force

  2. Which inequality gives the friction F in terms of the coefficient of friction mu and the normal contact force R?

    • F >= mu R
    • F <= mu R
    • F = mu / R
    • F = R / mu

  3. What term describes the maximum frictional force reached just before a body slips?

    • Limiting friction
    • Dynamic tension
    • Static friction
    • Normal reaction

  4. What type of quantity is the coefficient of friction μ?

    • Force in newtons
    • Mass in kilograms
    • Dimensionless constant
    • Vector quantity

  5. What is the magnitude of the frictional force on a perfectly smooth surface?

    • 0 N
    • Equal to weight
    • 9.8 N
    • μR

  6. The contact force between two rough surfaces has a normal component R and a frictional component F. What is the magnitude of the total contact force?

    • R + F
    • sqrt(R^2 + F^2)
    • R - F
    • R F

  7. What state is a body in when friction equals μR and it is about to move?

    • Limiting equilibrium
    • Dynamic equilibrium
    • Neutral equilibrium
    • Unstable equilibrium

  8. A block of mass 5 kg rests on a rough horizontal surface with coefficient of friction 0.4. Taking g = 9.8 m s^-2, what is the limiting friction?

    • 19.6 N
    • 0.4 N
    • 12.25 N
    • 49 N

  9. A 10 N force pushes a stationary block on a rough floor. What is the friction force?

    • 10 N
    • 0 N
    • 19.6 N
    • 49 N

  10. A block of mass 4 kg is pulled horizontally on a rough surface with coefficient 0.25. The applied force is 12 N. Taking g = 9.8 m s^-2, what is the acceleration?

    • 2.45 m s^-2
    • 0.75 m s^-2
    • 0.55 m s^-2
    • 3.00 m s^-2

  11. Mass 2 kg rests on a 30° rough incline with μ = 0.6. Is it in equilibrium?

    • Only dynamically
    • Insufficient information
    • Yes
    • No

  12. A block of mass 4 kg rests on a rough horizontal surface with mu = 0.5. A force of 20 N acts at 30 degrees above the horizontal. Taking g = 9.8 m s^-2, what is its acceleration, to 2 decimal places?

    • 0.68 m s^-2
    • 2.60 m s^-2
    • 1.21 m s^-2
    • 0.00 m s^-2

  13. A block of mass 3 kg slides down a rough plane inclined at 30 degrees to the horizontal with coefficient of friction 0.2. Taking g = 9.8 m s^-2, what is its acceleration, to 2 decimal places?

    • 3.20 m s^-2
    • 1.63 m s^-2
    • 8.49 m s^-2
    • 4.90 m s^-2

  14. A block of mass 5 kg is on a rough horizontal surface with R = 49 N and limiting friction 19.6 N. What is the magnitude of the total contact force, to 1 decimal place?

    • 49.0 N
    • 68.6 N
    • 52.8 N
    • 29.4 N

  15. A block slides at constant speed down a rough plane inclined at 30 degrees to the horizontal. What is the coefficient of friction, to 3 decimal places?

    • 0.333
    • 0.866
    • 0.500
    • 0.577

  16. What is the general inequality relationship between friction F and normal reaction R?

    • F = μR
    • F > μR
    • F ≤ μR
    • F ≥ μR

  17. A block of mass 10 kg on a rough horizontal surface with mu = 0.3 is pulled by a force P at 30 degrees above the horizontal. Taking g = 9.8 m s^-2, what value of P, to 1 decimal place, is needed to just start the block moving?

    • 28.9 N
    • 29.4 N
    • 33.3 N
    • 21.2 N

  18. A 6 kg mass on a rough floor with μ = 0.4 experiences a 15 N push. Does it move?

    • It moves steadily
    • It accelerates forward
    • It remains stationary
    • It accelerates backwards

  19. What is the friction value when a body on a rough plane is about to slide?

    • mg sin θ
    • 0 N
    • R
    • μR

  20. A block of mass 2 kg is at rest on a rough horizontal surface with mu = 0.5 and g = 9.8 m s^-2. What is the maximum horizontal force that can be applied without causing motion?

    • 4.9 N
    • 9.8 N
    • 19.6 N
    • 1 N

All OCR Maths quizzes