02-18-09 Notes: Momentum

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02-18-09 Notes: Momentum

  1. 1. <ul><li>Notes: Momemtum </li></ul><ul><li>CW: Acceleration and Momentum </li></ul><ul><li>H: The Laws of Motion </li></ul>
  2. 2. Momentum 2-18-09
  3. 3. Objectives <ul><li>describe the relationship between mass, velocity, inertia, and momentum </li></ul><ul><li>relate conservation of momentum to motion in a collision </li></ul>
  4. 4. What makes an object difficult to stop?
  5. 5. Calculating Momentum <ul><li>The momentum of an object is directly related to its mass and its velocity. </li></ul>
  6. 6. Mass <ul><li>Mass measures inertia. The mass of an object tells you how much the object resists accelerating. </li></ul>
  7. 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. 8. Velocity <ul><li>Fast objects are also difficult to stop. </li></ul>
  9. 9. Momentum = (mass)(velocity) p = mv
  10. 13. Example <ul><li>A ball of mass 2 kg is moving with a speed of 4 m/s. </li></ul><ul><li>What is its momentum? </li></ul>
  11. 14. Solution <ul><li>Momentum = (mass)(velocity) </li></ul><ul><li>p = mv </li></ul>
  12. 15. <ul><li>p = (2 kg)(4 m/s) </li></ul><ul><li>p = 8 kg m/s </li></ul>
  13. 16. Example <ul><li>A runner has a mass of 75 kg and is running at 6 m/s. </li></ul><ul><li>What is his momentum? </li></ul>
  14. 17. Solution <ul><li>Momentum = (mass)(velocity) </li></ul><ul><li>p = mv </li></ul>
  15. 18. <ul><li>p = (75 kg)(6 m/s) </li></ul><ul><li>p= 450 kg m/s </li></ul>
  16. 19. <ul><li>Momentum is a vector quantity. Its direction is the same as the direction of the object's velocity. </li></ul>
  17. 20. Elastic collision Resulting momentum
  18. 21. Two dimensional collision
  19. 22. Knowing the momentum of moving objects helps explain what happens when objects collide with one another.
  20. 23. <ul><li>Although moving objects can collide in many different ways, they have one important thing in common . </li></ul>
  21. 24. Law of Conservation of Momentum <ul><ul><li>The total momentum before and after the collision is not changed by the collision. </li></ul></ul>
  22. 25. collisions

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