02-18-09 Notes: Momentum
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02-18-09 Notes: Momentum

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02-18-09 Notes: Momentum Presentation Transcript

  • 1.
    • Notes: Momemtum
    • CW: Acceleration and Momentum
    • H: The Laws of Motion
  • 2. Momentum 2-18-09
  • 3. Objectives
    • describe the relationship between mass, velocity, inertia, and momentum
    • relate conservation of momentum to motion in a collision
  • 4. What makes an object difficult to stop?
  • 5. Calculating Momentum
    • The momentum of an object is directly related to its mass and its velocity.
  • 6. Mass
    • Mass measures inertia. The mass of an object tells you how much the object resists accelerating.
  • 7. Nothing will change speed unless acted upon by a force. If it’s sitting still, it will keep sitting still. If it’s moving fast, it will keep moving fast. Only a force can change the velocity of an object .
  • 8. Velocity
    • Fast objects are also difficult to stop.
  • 9. Momentum = (mass)(velocity) p = mv
  • 10.  
  • 11.  
  • 12.  
  • 13. Example
    • A ball of mass 2 kg is moving with a speed of 4 m/s.
    • What is its momentum?
  • 14. Solution
    • Momentum = (mass)(velocity)
    • p = mv
  • 15.
    • p = (2 kg)(4 m/s)
    • p = 8 kg m/s
  • 16. Example
    • A runner has a mass of 75 kg and is running at 6 m/s.
    • What is his momentum?
  • 17. Solution
    • Momentum = (mass)(velocity)
    • p = mv
  • 18.
    • p = (75 kg)(6 m/s)
    • p= 450 kg m/s
  • 19.
    • Momentum is a vector quantity. Its direction is the same as the direction of the object's velocity.
  • 20. Elastic collision Resulting momentum
  • 21. Two dimensional collision
  • 22. Knowing the momentum of moving objects helps explain what happens when objects collide with one another.
  • 23.
    • Although moving objects can collide in many different ways, they have one important thing in common .
  • 24. Law of Conservation of Momentum
      • The total momentum before and after the collision is not changed by the collision.
  • 25. collisions