momentum

• All moving objects have momentum
• If an object is not moving, its momentum is zero
• Momentum


  Mass multiplied by velocity
• The unit of momentum is kilograms meter per second
• The equation for momentum is not given in the exam, so it needs to be learned
• Conservation of momentum


  In a closed system, the total momentum before an event is equal to the total momentum after the event
• Collision between a moving van and a stationary car

  1. Van has momentum before collision

  2. Van and car move together at a lower velocity after collision

  3. Total momentum before collision = Total momentum after collision
• Firing of a cannon

  1. Cannon and cannonball have zero momentum before firing

  2. Cannonball has forward momentum after firing

  3. Cannon has backward momentum after firing

  4. Total momentum before firing = Total momentum after firing = 0