Lesson 3.5.1

3.5.1 Newton's laws of motion Quiz: OCR Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.5.1, Newton's laws of motion: 20 multiple choice questions for the OCR Physics (H156), Unit 2: Forces and motion, written with Revision Ninja.

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The 20 questions

  1. According to Newton's first law, what causes an object's velocity to change?

    • Resultant force
    • Constant speed
    • Internal force
    • Balanced forces

  2. According to Newton's second law, net force is equal to the rate of change of what quantity?

    • Displacement
    • Kinetic energy
    • Momentum
    • Velocity

  3. According to Newton's third law, paired interaction forces act on how many bodies?

    • Three separate bodies
    • The same body
    • Any single body
    • Two different bodies

  4. What type of physical quantity is linear momentum, calculated as mass times velocity?

    • Dimensionless scalar
    • Base quantity
    • Scalar
    • Vector

  5. The impulse of a net force is equal to the change in which physical quantity?

    • Velocity
    • Power
    • Momentum
    • Kinetic energy

  6. What physical quantity is represented by the area under a force-time graph?

    • Impulse
    • Work done
    • Acceleration
    • Power

  7. Under what condition does the net force equation simplify to F = ma?

    • Constant mass
    • Zero acceleration
    • Constant speed
    • Constant velocity

  8. A 2 kg object moves at 6 m s^-1. What is its linear momentum?

    • 0.33 kg m s^-1
    • 36 kg m s^-1
    • 3 kg m s^-1
    • 12 kg m s^-1

  9. A constant force of 5 N acts for 0.4 s. What is the impulse?

    • 12.5 N s
    • 2 N s
    • 5.4 N s
    • 0.08 N s

  10. A 0.15 kg ball is struck by a bat. It arrives at 20 m s^-1 and leaves at 30 m s^-1 in the opposite direction. What is the magnitude of the impulse?

    • 7.5 N s
    • 1.5 N s
    • 10.5 N s
    • 3.0 N s

  11. In the bat collision above, the contact lasts 0.01 s. What is the average force on the ball?

    • 75 N
    • 750 N
    • 0.75 N
    • 7500 N

  12. A 4 kg block initially at rest has momentum 60 kg m s^-1 after 4 s of a constant net force. What is the net force?

    • 15 N
    • 240 N
    • 0.067 N
    • 60 N

  13. A force that rises uniformly from 0 to 40 N in 0.5 s, as a triangular force-time graph, gives an impulse of:

    • 20 N s
    • 5 N s
    • 40 N s
    • 10 N s

  14. Quadrupling collision time for the same change in momentum affects average force by what factor?

    • 1/16
    • 1/4
    • 16
    • 4

  15. A 1500 kg car accelerates from rest to 20 m s^-1 in 10 s at constant force. What is the net force?

    • 3000 N
    • 300 N
    • 30000 N
    • 1500 N

  16. A 2 kg object starts from rest and experiences a force F = 4t N for 3 s. What is its speed at t = 3 s?

    • 36 m s^-1
    • 4.5 m s^-1
    • 9 m s^-1
    • 18 m s^-1

  17. A 3 kg ball falls onto the floor at 6 m s^-1 and rebounds at 4 m s^-1, with contact lasting 0.02 s. What is the average force on the ball?

    • 300 N
    • 750 N
    • 1500 N
    • 3000 N

  18. A rocket exerts a backward force on exhaust gas. What force forms its Newton's third law pair?

    • Gravity pulling rocket
    • Earth pulling gas
    • Air dragging rocket
    • Gas pushing rocket

  19. A 2 kg object has kinetic energy 50 J. What is its linear momentum?

    • 10 kg m s^-1
    • 100 kg m s^-1
    • 25 kg m s^-1
    • 14.1 kg m s^-1

  20. A 0.2 kg ball hits a wall at 5 m s^-1 and rebounds at 3 m s^-1. What is the magnitude of the impulse on the ball?

    • 8 N s
    • 1.6 N s
    • 0.4 N s
    • 3.2 N s

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