2.4.2 Conservation of linear momentum in one dimension Quiz: Pearson Edexcel Physics, Unit 2

The 20 questions

1. What condition is required for total linear momentum to be conserved?

   • Zero initial velocity
   • Constant velocity always
   • Zero resultant external force
   • Zero internal energy

2. Which quantities are conserved in a perfectly elastic collision?

   • Kinetic energy only
   • Total energy only
   • Momentum and kinetic energy
   • Momentum only

3. Which quantity is always conserved in any isolated inelastic collision?

   • Velocity
   • Momentum
   • Total energy only
   • Kinetic energy

4. A 2.0 kg trolley moving at 3.0 m s^-1 collides with and sticks to a 1.0 kg trolley at rest. What is their common velocity?

   • 2.0 m s^-1
   • 6.0 m s^-1
   • 3.0 m s^-1
   • 1.0 m s^-1

5. Two trolleys of 1.0 kg each approach each other at 2.0 m s^-1 and stick together. What is their velocity after the collision?

   • 1.0 m s^-1
   • 4.0 m s^-1
   • 0
   • 2.0 m s^-1

6. A 3.0 kg object at rest splits into a 1.0 kg piece moving at 6.0 m s^-1 east and a 2.0 kg piece. What is the velocity of the 2.0 kg piece?

   • 6.0 m s^-1 west
   • 12 m s^-1 west
   • 3.0 m s^-1 east
   • 3.0 m s^-1 west

7. A 4.0 kg body moving at 5.0 m s^-1 east collides with and sticks to a 2.0 kg body moving at 2.0 m s^-1 west. What is their combined velocity?

   • 4.0 m s^-1 east
   • 1.0 m s^-1 east
   • 0.5 m s^-1 west
   • 2.7 m s^-1 east

8. In an elastic head-on collision between two 1.0 kg trolleys, a moving trolley at 4.0 m s^-1 hits one at rest. What is the velocity of the first trolley afterwards?

   • 4.0 m s^-1
   • 2.0 m s^-1
   • -4.0 m s^-1
   • 0

9. A 2.0 kg trolley at 3.0 m s^-1 sticks to a 1.0 kg trolley at rest. How much kinetic energy is lost in the collision?

   • 6.0 J
   • 9.0 J
   • 3.0 J
   • 1.5 J

10. A 0.10 kg ball moving at 4.0 m s^-1 hits a wall and rebounds at 3.0 m s^-1. What is the magnitude of the change in momentum of the ball?

    • 0.40 kg m s^-1
    • 1.2 kg m s^-1
    • 0.70 kg m s^-1
    • 0.10 kg m s^-1

11. A 0.50 kg ball moving at 6.0 m s^-1 hits a 1.5 kg ball at rest and they stick together. What percentage of the kinetic energy is lost?

    • 50%
    • 90%
    • 75%
    • 25%

12. What happens to total momentum when a resultant external force acts?

    • It always increases
    • It remains constant
    • It becomes zero
    • It is not conserved

13. A 1.0 kg object moving at 6.0 m s^-1 collides elastically head-on with a stationary 3.0 kg object. What is the velocity of the 3.0 kg object afterwards?

    • 3.0 m s^-1
    • 1.5 m s^-1
    • 2.0 m s^-1
    • 6.0 m s^-1

14. A 2.0 kg trolley at 4.0 m s^-1 east collides with and sticks to a 1.0 kg trolley at 2.0 m s^-1 west. What is their common velocity?

    • 6.0 m s^-1 east
    • 2.0 m s^-1 east
    • 0.67 m s^-1 east
    • 2.0 m s^-1 west

15. A 0.80 kg object moving at 3.0 m s^-1 east collides with and sticks to a 0.20 kg object at rest. What is their final velocity?

    • 2.4 m s^-1 east
    • 3.0 m s^-1 east
    • 0.6 m s^-1 east
    • 12 m s^-1 east

16. A 5.0 kg block moving at 2.0 m s^-1 east splits into a 2.0 kg piece moving at 3.0 m s^-1 east and a 3.0 kg piece. What is the velocity of the 3.0 kg piece?

    • 1.3 m s^-1 east
    • 3.0 m s^-1 east
    • 0.67 m s^-1 east
    • 4.0 m s^-1 east

17. A 2.0 kg object moving at 6.0 m s^-1 hits a 4.0 kg object at rest and they stick together. What is the total kinetic energy afterwards?

    • 12 J
    • 6.0 J
    • 36 J
    • 24 J

18. A 3.0 kg trolley moving at 2.0 m s^-1 collides with a 3.0 kg trolley at rest and they stick together. What is the momentum of the combined trolleys afterwards?

    • 6.0 kg m s^-1
    • 1.0 kg m s^-1
    • 12 kg m s^-1
    • 3.0 kg m s^-1

19. A 0.40 kg ball moving at 5.0 m s^-1 is caught by a stationary 0.10 kg ball and they stick together. What is their common speed?

    • 5.0 m s^-1
    • 4.0 m s^-1
    • 1.0 m s^-1
    • 2.5 m s^-1

20. Which quantity is always conserved in any collision in an isolated system?

    • Total kinetic energy
    • Total mechanical energy
    • Total velocity
    • Total momentum

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