Lesson 4.5.7.2

4.5.7.2 Conservation of momentum Quiz: AQA Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.5.7.2, Conservation of momentum: 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. In a closed system, how does total momentum before an event compare to after?

    • It is equal
    • It becomes zero
    • It is greater
    • It is less

  2. What defines a closed system in physics calculations involving momentum?

    • No external forces
    • Zero velocity
    • Constant temperature
    • No friction exists

  3. A 2 kg trolley moving at 3 m/s hits a stationary 1 kg trolley and they stick together. What is their common velocity?

    • 3 m/s
    • 6 m/s
    • 2 m/s
    • 1 m/s

  4. A 4 kg trolley moves at 2 m/s to the right and a 2 kg trolley moves at 1 m/s to the left. They stick together. What is the final velocity?

    • 1 m/s to the left
    • 1 m/s to the right
    • 0 m/s
    • 3 m/s to the right

  5. A 3 kg block at rest is hit by a 1 kg ball moving at 6 m/s, and the ball stops dead. What is the block's speed?

    • 0.33 m/s
    • 6 m/s
    • 2 m/s
    • 3 m/s

  6. Why does a stationary trolley move when struck by a moving trolley?

    • Momentum is transferred
    • Mass decreases
    • Energy is created
    • Gravity increases

  7. What do light gates typically measure in a trolley collision experiment?

    • Force
    • Temperature
    • Mass
    • Velocity

  8. What does evenly spaced dots on ticker timer tape indicate?

    • Constant velocity
    • Constant acceleration
    • Zero speed
    • Deceleration

  9. Two 0.5 kg trolleys move towards each other at 2 m/s each and stick together. What is their final velocity?

    • 1 m/s
    • 2 m/s
    • 0 m/s
    • 4 m/s

  10. A 3 kg trolley at 4 m/s hits a stationary 1 kg trolley and slows to 2 m/s. What is the speed of the 1 kg trolley afterwards?

    • 12 m/s
    • 4 m/s
    • 2 m/s
    • 6 m/s

  11. Why is momentum conserved during a collision in a closed system?

    • Equal opposite forces
    • Friction is zero
    • Mass is lost
    • Energy is destroyed

  12. A 1200 kg car at 10 m/s hits a stationary 800 kg car and they lock together. What is their velocity afterwards?

    • 6 m/s
    • 4 m/s
    • 10 m/s
    • 8 m/s

  13. Momentum drops slightly from 5 to 4.2 kg m/s after a collision. Why?

    • Velocity increased
    • Friction and error
    • Mass was created
    • Momentum is lost

  14. A stationary 6 kg object splits into a 2 kg piece at 6 m/s and a 4 kg piece. What is the 4 kg piece velocity?

    • 12 m/s forward
    • 6 m/s opposite
    • 3 m/s opposite
    • 3 m/s forward

  15. A 0.1 kg ball at 5 m/s hits a 0.3 kg block at rest and sticks to it. What is their final speed?

    • 1.25 m/s
    • 5 m/s
    • 0.5 m/s
    • 1.67 m/s

  16. When two objects stick together in a collision, what happens to their total mass?

    • Becomes zero
    • Decreases by half
    • Doubles in size
    • Remains the same

  17. Which measurements are needed to test conservation of momentum in a trolley collision?

    • Mass and velocity
    • Distance and time
    • Force and time
    • Acceleration and mass

  18. A 1 kg ball moving at 3 m/s hits a 2 kg trolley at rest and afterwards the ball moves at 1 m/s in the same direction. What is the trolley's velocity?

    • 3 m/s
    • 1 m/s
    • 0.5 m/s
    • 2 m/s

  19. Total momentum before a collision is 12 kg m/s. Afterwards a 4 kg object carries 9 kg m/s. What is the momentum of the other object?

    • 12 kg m/s
    • 3 kg m/s
    • 9 kg m/s
    • 21 kg m/s

  20. A 4 kg gun fires a 0.04 kg bullet at 300 m/s. What is the recoil speed of the gun?

    • 3 m/s
    • 30 m/s
    • 7500 m/s
    • 0.03 m/s

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