momentum

• Describe the factors that affect the momentum of an object


  The momentum of a body is affected by its mass and velocity.
• calculate the momentum of moving objects

  p=mv,

  p= momentum,

  m= mass

  v= velocity.
• Describe examples of momentum in collisions


  collision between a person and a medicine ball
• Use the idea of conservation of momentum to calculate velocities of objects after collisions

  1. Mass M also now has momentum.
  2. The velocity of m is now -v (since it is now travelling to the left) and the velocity of M is V.
  3. The total momentum is now the momentum of M + momentum of m.
  4. This is (M × V) + (m × -v) or (M × V) – (m × v)
• Calculate the force needed to produce a change in momentum in a given time

  F = (mv – mu) / t 

  m(v – u) / t = ma

  a = (v – u) / t.