momentum

• how to calculate momentum

  momentum = mass × velocity or p=mv
• A lorry has a mass of 7,500 kg. It travels south at a speed of 25 m/s. Calculate the momentum of the lorry.

  7500x25=187,500kg/ms
• an example of momentum....

  an elephant has no momentum when it is standing still. When it begins to walk, it will have momentum in the same direction as it is travelling. The faster the elephant walks, the larger its momentum will be.
• the momentum of an object depends only on its mass and velocity. If two objects have the same momentum, then they must have the same mass and velocity (or vice versa).
• what is momentum

  Momentum is the quantity that is used to describe the state of motion of an object with a non-zero mass. Hence, momentum is applicable to any moving object. 
• how does a change in momentum occur?


  When a force acts on an object that is moving, or able to move, there is a change in momentum:
• what is the main law of momentum

  the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.