Lesson 3.03c

3.03c Newton's second law Quiz: OCR Maths, Unit 18

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.03c, Newton's second law: 20 multiple choice questions for the OCR Maths (H240), Unit 18: Forces and Newton's Laws, written with Revision Ninja.

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The 20 questions

  1. Which equation is Newton's second law for a body of constant mass moving in a straight line under constant force?

    • F = m/a
    • F = mv
    • F = ma^2
    • F = ma

  2. In SI base units, what are the units of force?

    • kg m s⁻²
    • N s⁻¹
    • kg m s⁻¹
    • kg m² s⁻²

  3. In which direction does the acceleration of a body always act?

    • Displacement
    • Resultant force
    • Momentum
    • Velocity

  4. For a fixed resultant force, how does acceleration relate to mass?

    • Exponentially proportional
    • Inversely proportional
    • Directly proportional
    • Independent

  5. According to Newton's second law, what does a non-zero resultant force produce?

    • Acceleration
    • Constant speed
    • Equilibrium
    • Zero displacement

  6. In A Level Mechanics, the formula F = ma assumes what property of the body?

    • Constant mass
    • Variable mass
    • Increasing velocity
    • Zero mass

  7. A body of mass 5 kg has a resultant force of 20 N acting on it. What is its acceleration?

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

  8. A car of mass 800 kg has a driving force of 2400 N and a resistance of 400 N acting opposite to the motion. What is its acceleration?

    • 3.0 m s^-2
    • 2.5 m s^-2
    • 2000 m s^-2
    • 4.0 m s^-2

  9. A lift of mass 500 kg has a tension of 6000 N upward in its cable. Taking g = 9.8 m s^-2, what is its upward acceleration?

    • 1.1 m s^-2
    • 2.2 m s^-2
    • 12.0 m s^-2
    • 9.8 m s^-2

  10. A body of mass 2 kg has acceleration (4i - 3j) m s^-2. What is the resultant force on it?

    • (8i + 6j) N
    • (4i - 3j) N
    • (2i - 1.5j) N
    • (8i - 6j) N

  11. A particle of mass 2 kg is acted on by forces F1 = (3i + j) N and F2 = (-i + 4j) N only. What is its acceleration?

    • (i + 2.5j) m s^-2
    • (2i + 5j) m s^-2
    • (i + 5j) m s^-2
    • (2.5i + j) m s^-2

  12. A force of 10 N acts on a body at 30 degrees below the horizontal. What is the horizontal component of the force, to 2 decimal places?

    • 10.00 N
    • 8.66 N
    • 5.00 N
    • 11.55 N

  13. A block of mass 4 kg is pulled along a smooth horizontal surface by a force of 12 N at 60 degrees above the horizontal. What is its acceleration?

    • 1.5 m s^-2
    • 6.0 m s^-2
    • 3.0 m s^-2
    • 2.6 m s^-2

  14. A body of mass 3 kg starts from rest and is acted on by a constant horizontal force of 6 N. What is its speed after 4 s?

    • 2 m s^-1
    • 24 m s^-1
    • 8 m s^-1
    • 12 m s^-1

  15. A force of 3 N acts on a body of mass 6 kg. What is the acceleration of the body?

    • 0.5 m s^-2
    • 2 m s^-2
    • 18 m s^-2
    • 3 m s^-2

  16. A force of 10 N acts at 30 degrees above the horizontal on a particle of mass 2 kg that moves along the horizontal. What is its horizontal acceleration?

    • 2.50 m s^-2
    • 4.33 m s^-2
    • 5.00 m s^-2
    • 8.66 m s^-2

  17. A particle of mass 4 kg is acted on by a variable force F = 4t i N for t >= 0, and starts from rest. What is its velocity at t = 2 s?

    • 0.5i m s^-1
    • 8i m s^-1
    • 2i m s^-1
    • 4i m s^-1

  18. A particle of mass 4 kg is acted on by the force (4i + tj) N for t >= 0, and starts from rest at the position 3i - 5j m. What is its position vector at t = 3 s?

    • 4.5i - 3.875j m
    • 7.5i - 3.875j m
    • 7.5i - 5j m
    • 4.5i + 1.125j m

  19. Equal forces act on masses of 2 kg and 6 kg. What is the ratio of their accelerations?

    • 1 to 9
    • 9 to 1
    • 1 to 3
    • 3 to 1

  20. A car of mass 1500 kg accelerates uniformly from 10 m s^-1 to 25 m s^-1 in 5 s against a resistance of 600 N. What is the driving force?

    • 600 N
    • 5100 N
    • 4500 N
    • 3900 N

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