2. Work, Kinetic Energy, Potential Energy & Springs ~ Conservation of Energy

3. Some definitions:

4. Work and Kinetic Energy video

5. In 1996, Paul Tracy, while riding in his Indie Car that had a mass of 711 kg, was able to achieve a world record velocity of 413.5 km/h. What was his kinetic energy at that time? P 290 – Q 2, 3, 4

6. Potential Energy video 2 nd Potential Energy video

8. Spring Energy video 2 nd Spring Energy video 3 rd Spring Energy video 4 th Spring Energy video 5 th Spring Energy video

10. InitialFinal √x xx x√ xx A question will dictate which energies are involved. We must consider ALL types of energies in a problem, so that nothing is forgotten. This little table helps to remind you of all the energies as a check-list. The long equation above is greatly simplified in the next step thanks to this table.

11. A 3.0 kg watermelon is dropped from a building that is 48.0 m tall. Neglecting air-resistance, what is the speed of the watermelon just as it strikes the ground? Does the mass of the melon matter? InitialFinal x√ √x xx xx

12. A 2.0 kg block is sliding on a level, frictionless surface when it encounters a spring bumper. The spring has a spring coefficient of 62 N/m and is compressed 4.80 cm. How fast was the block moving? InitialFinal √x xx x√ xx

13. Page342. Questions: 29, 32, 36, 52, 54

15. http://www.youtube.com/watch?v=9g6hUKx5xVc Spring Energy http://www.youtube.com/watch?v=vmnRZ8IdZKM 100 Discoveries in physics https://www.youtube.com/watch?v=Bpid0LBTqWg Drop Feather and Hammer http://www.youtube.com/watch?v=5C5_dOEyAfk Energy Review http://www.youtube.com/watch?v=qZ4FFWvZtyo 2 nd Potential Energy video