6.5.5.2 Conservation of momentum Quiz: AQA Combined Science, Unit 22

The 20 questions

1. In a closed system, what is true of total momentum before and after an event?

   • It becomes zero
   • It decreases
   • It increases
   • It is equal

2. The principle of conservation of momentum applies in what type of system?

   • Frictionless plane
   • Open system
   • Closed system
   • Isolated vacuum

3. Which specific quantity is conserved in a closed system during a collision?

   • Total velocity
   • Total momentum
   • Total mass
   • Total kinetic energy

4. Trolley A (2 kg, 3 m/s) hits stationary trolley B (1 kg) and they stick together. Their common velocity is:

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

5. A 2 kg trolley moving at 4 m/s hits a stationary 2 kg trolley and they stick together. Their speed afterwards is:

   • 1 m/s
   • 4 m/s
   • 8 m/s
   • 2 m/s

6. A 2 kg gun fires a 0.02 kg bullet at 300 m/s. The recoil speed of the gun is:

   • 0.03 m/s
   • 6 m/s
   • 3 m/s
   • 300 m/s

7. A 3 kg object moving at 4 m/s hits a stationary 1 kg object. After the collision, the 3 kg object moves at 2 m/s. The 1 kg object moves at:

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

8. (Harder) A 2 kg trolley moves east at 3 m/s and a 1 kg trolley moves west at 6 m/s. The total momentum is:

   • 12 kg m/s west
   • 0 kg m/s
   • 12 kg m/s east
   • 6 kg m/s east

9. A stationary 4 kg object splits into 1 kg and 3 kg pieces. The 3 kg piece moves east at 2 m/s. The 1 kg piece moves at:

   • 1.3 m/s west
   • 2 m/s west
   • 6 m/s east
   • 6 m/s west

10. What is conserved in a closed system during a collision?

    • Total energy
    • Total momentum
    • Total kinetic energy
    • Total speed

11. Which measurements are needed to test conservation of momentum for a trolley?

    • Distance and speed
    • Force and time
    • Mass and velocity
    • Weight and height

12. What do light gates directly measure in a collision practical?

    • Mass
    • Force
    • Acceleration
    • Time

13. What physical quantity does a ticker timer tape show directly over time?

    • Weight
    • Mass
    • Speed
    • Momentum

14. (Harder) Two 2 kg balls move towards each other: one at 3 m/s east and one at 1 m/s west. The total momentum is:

    • 8 kg m/s east
    • 4 kg m/s east
    • 0 kg m/s
    • 2 kg m/s west

15. (Harder) A 60 kg skater pushes off a 20 kg skater, and the 60 kg skater moves at 1 m/s. The 20 kg skater moves at:

    • 60 m/s
    • 3 m/s
    • 1 m/s
    • 0.33 m/s

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

    • Mass is added
    • Mass is halved
    • Mass becomes zero
    • Mass is squared

17. A 0.5 kg ball moving at 4 m/s hits a stationary 1.5 kg ball and they stick together. Their common velocity is:

    • 4 m/s
    • 2 m/s
    • 1 m/s
    • 0.5 m/s

18. (Harder) Total momentum before a collision is 12 kg m/s. After it, one object has 5 kg m/s. The other object has:

    • 5 kg m/s
    • 7 kg m/s
    • 12 kg m/s
    • 17 kg m/s

19. Which condition defines a closed system for momentum?

    • Zero mass
    • No external forces
    • High friction
    • Constant speed

20. (Harder) A 2 kg trolley moving at 3 m/s explodes into two 1 kg parts. One part moves forward at 2 m/s. The other moves at:

    • 2 m/s
    • 1 m/s
    • 4 m/s
    • 6 m/s

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