1. Conservation of Momentum

2. The Equation

3. What Causes a Change Momentum?

4. What about two objects? Perfectly Inelastic Collisions  2 or more objects combine into one Explosions  One object becomes 2 or more Elastic Collisions  Two or more objects collide, but do not stick

5. Perfectly Inelastic Collisions

6. Karate Vs. Sumo

7. Explosions

8. Elastic Collisions

9. What About the Energy?? Is energy conserved in a collision? Well of course it is, otherwise physicists are screwed! But lets see this in action, this time reversing the order…  Elastic Collisions  Explosions  Inelastic Collisions

10. Energy in an Elastic Collision

11. Solving For Velocity

12. Checking Energy

13. Explosions

15. Where is the Energy? If it is not kinetic, it must be potential, but where? We call this “Elastic Potential Energy” or “Potential Energy of a Spring” in this case Therefore, we say Kinetic Energy is not conserved in an explosion! In fact, it GAINS kinetic energy!

16. Energy in Perfectly Inelastic Collisions

17. Perfectly Inelastic Collision

18. Perfectly Inelastic Collisions

19. What Happened to This Energy? It should be no surprise that since an explosion does not conserve Kinetic Energy, neither do perfectly inelastic collisions. However, Inelastic Collisions LOST energy. While it did not disappear, it did transform into other types of energy  Heat, vibrations, sound, ect.

20. A New Type of Collision Most collisions are neither elastic nor perfectly inelastic Nearly every collision results in loss of kinetic energy We simply say that since energy was converted, the collision was “Inelastic”

21. Summing Up the Collisions Elastic Collision  Objects “bounce” off each other after the collision. No loss of kinetic energy. Inelastic Collision  Objects “bounce” off each other after the collision. However, there is a loss of kinetic energy. Perfectly Inelastic Collision  Objects “stick” together after the collision. Maximum Loss of kinetic energy. Explosions  An inelastic collision done backwards. GAIN in kinetic energy.

22. This is too Easy… Activating PreAP Drives…

23. 2 Unknowns

26. We cannot immediately eliminate, so we must use substitution

27. 2 Unknowns