Physics Momentum 1

• Momentum


  A property that all moving objects have
• Momentum


  Equal to the mass of an object multiplied by its velocity
• Momentum of objects


  • 4,500 kg dinosaur at 12 m/s = 54,000 kg·m/s
  • 1,200 kg car at 25 m/s = 30,000 kg·m/s
• Momentum


  • A vector quantity, has both magnitude and direction
• Conservation of momentum principle


  In a closed system, the total momentum before an event (e.g. collision) is the same as the total momentum after the event
• Finding velocity after collision

  1. Find total momentum before collision

  2. Use conservation of momentum principle to find total momentum after collision

  3. Rearrange momentum equation to find velocity
• Stationary object


  Has zero momentum
• Finding gun recoil velocity

  1. Find bullet momentum using momentum equation

  2. Set gun momentum plus bullet momentum equal to zero

  3. Rearrange equation to find gun velocity
• Momentum symbol


  p = mv