Lesson 4.5.7.3

4.5.7.3 Changes in momentum (physics only) Quiz: AQA Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.5.7.3, Changes in momentum (physics only): 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 5: Forces, written with Revision Ninja.

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The 20 questions

  1. Force is equal to the rate of change of what?

    • Momentum
    • Velocity
    • Mass
    • Kinetic energy

  2. A 60 kg person goes from 6 m/s to rest in 0.2 s. What is the average force?

    • 72 N
    • 1800 N
    • 180 N
    • 18 N

  3. How does an airbag reduce injury during a vehicle collision?

    • Increases stopping time
    • Reduces vehicle mass
    • Increases impact force
    • Decreases stopping time

  4. A 0.2 kg ball is hit from rest to 30 m/s in 0.01 s. What is the average force on it?

    • 600 N
    • 60 N
    • 6000 N
    • 3 N

  5. Which stopping time produces the largest impact force for a constant momentum change?

    • 0.10 s
    • 10.0 s
    • 1.00 s
    • 0.01 s

  6. How large is the average force on a 1200 kg car whose momentum falls from 18 000 kg m/s to zero in 6 s?

    • 300 N
    • 30 N
    • 18 000 N
    • 3000 N

  7. Why are gymnasium crash mats designed to be thick and soft?

    • Decrease weight force
    • Increase impact time
    • Decrease momentum change
    • Increase impact force

  8. Which combination equals change in momentum?

    • Force divided by time
    • Mass multiplied by distance
    • Force multiplied by time
    • Velocity divided by mass

  9. A 25 kg object at rest is pushed by a 500 N force for 4 s. What is its final velocity?

    • 125 m/s
    • 80 m/s
    • 2000 m/s
    • 20 m/s

  10. A 2 kg trolley moving at 3 m/s hits a wall and rebounds at 3 m/s. What is the size of its momentum change?

    • 6 kg m/s
    • 12 kg m/s
    • 0 kg m/s
    • 3 kg m/s

  11. A force of 8 N acts for 3 s. What is the change in momentum?

    • 5 kg m/s
    • 2.67 kg m/s
    • 24 kg m/s
    • 11 kg m/s

  12. A 0.4 kg ball falls onto a floor at 5 m/s and stops in 0.02 s. What is the average force on it?

    • 10 N
    • 100 N
    • 1000 N
    • 0.04 N

  13. If the time for a momentum change doubles while the change stays constant, what happens to the force?

    • It quadruples
    • It doubles
    • It stays same
    • It halves

  14. Which feature is designed to increase stopping time in a crash?

    • A thin metal plate
    • A rigid concrete barrier
    • A hard plastic dashboard
    • A crumple zone

  15. A braking car loses 24 000 kg m/s of momentum in 12 s. If the same change happened in 6 s, what would the force be?

    • 8000 N
    • 2000 N
    • 4000 N
    • 1000 N

  16. Which unit combination is equivalent to the newton?

    • kg m2/s
    • kg/s
    • kg m/s
    • kg m/s2

  17. A 4 kg object changes velocity from +5 m/s to -5 m/s in 0.5 s. What is the magnitude of the average force?

    • 80 N
    • 160 N
    • 20 N
    • 40 N

  18. Which car experiences the smaller force when stopping from the same speed?

    • Stops in 0.05 s
    • Rigid wall impact
    • Crumples over 0.5 s
    • Stops in 0.01 s

  19. A 70 kg runner lands at 6 m/s and comes to rest in 0.5 s. What is the average force?

    • 84 N
    • 840 N
    • 420 N
    • 8400 N

  20. A 4 kg object speeds up at 3 m/s2. What is the resultant force on it?

    • 3 N
    • 12 N
    • 1.33 N
    • 7 N

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