Momentum

• What is the equation used to calculate an object's momentum?

  Momentum = Mass x Velocity
• What is the unit used for momentum?

  kg m/s
• What can be said about momentum in a closed system before and after a collision?

  The total momentum before equals total momentum afterwards
• What is the equation linking change in momentum, force, and time?

  Force x Time = Change in Momentum
• What is the equation for change in momentum in terms of mass and velocity?


  F Δt = mΔv
• What quantity is equal to the force experienced in a collision?

  The rate of change of momentum
• If an object's change of momentum is fixed, how can the force experienced be reduced?

  Increase the length of time for change
• How does a seatbelt improve a passenger's safety during a collision?

  • Passenger decelerates from vehicle's velocity to zero
  • Undergoes a fixed change of momentum
  • Force experienced equals rate of change of momentum
  • Seatbelts increase time over which force is applied
  • Reduces rate of change of momentum and force experienced