momentum

• State the equation used to calculate an object’s momentum

  Momentum = mass x velocity
• What is the unit used for momentum

  Kg m/s

  kilogram meters per seconds
• In a closed system what can be said about the momentum before and after collision

  the total momentum before is equal to the total momentum afterwards
• State an equation linking change momentum, force and time

  Force x time = change in momentum
• What quantity is equal to the force experienced in a collision

  The rate of change of momentum
• If an objects change of momentum is fixed , what is the only way to reduced the force that the object experiences

  Increase the length of time over which the change of momentum occurs
• Explain how a seatbelt improves a passengers safety during a collision

  • Passengers must decelerate from the vehicles velocity at impact to zero, meaning they undergo a fixed change of momentum
  • the force they experience is equal to the rate of change of momentum
  • seatbelts increase the time over which the force is applied , reducing the rate of change of momentum and therefore reducing the force experienced