Momentum and Collisions

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  • Created by: joydada
  • Created on: 12-04-17 11:40

1. Two runners collide and move off together. Runner A has a velocity of 5 m/s and mass of 85kg. Runner B has a velocity of 9 m/s and mass of 60kg. How fast do they move after the collision?

  • 7 m/s
  • 1 m/s
  • 6.6 m/s
  • 0.9 m/s
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2. What is the unit of momentum?

  • gm/s
  • kg/ms
  • kgm/s
  • kgm/s^2

3. What is the function of a crumple zone?

  • Crumple Zones crumple on impact and increase the time taken for a change of momentum to occur
  • Crumple Zones crumple before a collision occurs so that the force is acting over a smaller area and minimalises the impact
  • Crumple Zones crumple just after a collision occurs to decrease the object's size and hence its momentum

4. What is the function of seat belts?

  • Seat Belts are firm and don't move when a collision occurs so that the wearer stays in the vehicle
  • Seat Belts stretch slightly to increase the time taken for the wear to stop and reduces the force acting on the chest
  • Seat Belts prohibit the wearer to move and change the centre of gravity of the vehicle which may cause it to fall out of equilibrium

5. How do you decrease the force acting upon an object that has experienced a change in momentum?

  • Increase the change in momentum
  • Increase the time taken for the change to occur
  • Decrease the time taken for the change to occur
  • Decrease the change in momentum
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