2. Momentum 2-18-09

4. What makes an object difficult to stop?

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 .

9. Momentum = (mass)(velocity) p = mv

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.

25. collisions