5.7 Momentum

• Momentum


  Mass x Velocity
• The unit used for momentum is kg m/s (kilogram metres per second)
• In a closed system, the total momentum before a collision is equal to the total momentum afterwards
• Equation linking change in momentum, force and time

  1. Force x Time = Change in Momentum

  2. F Δt = mΔv
• Force experienced in a collision

  The rate of change of momentum
• If an object's change of momentum is fixed

  The only way to reduce the force that the object experiences is to increase the length of time over which the change of momentum occurs