1. Section 2: Kinetic Energy & Potential Energy
Lockheed Martin completes final test flight of its hyper-velocity kinetic weapon

2. 400 meter in diameter and 19,000 mi/hr (4000 Megatons) (video on files)

3. Video:

4. Kinetic Energy = Energy of a moving object
KE = 1/2mv2
Sample Problem: Find the KE of a moving car with the following parameters

5. Conceptual Question: To increase the KE, is it better to increase the mass or speed and why?

6. Work Kinetic Energy Theorem
A fellow pushes a 1000kg car with 20N for 5 meters. Find the cars kinetic energy?

7. Gravitational Potential Energy (PEg)
PEg = mgh
Demo: Bucket of bricks at different heights .

8. Technology Applications

9. Elastic Potential Energy (PEe)
PEe = 1/2kx2
Find the Following:
A sling shot has a spring constant of 2 N/m. Find the energy stored in the band if it is pulled back to 1 meter.
Find the energy in the band if it is pulled back to two meters.
3) Find KE of the rock when it is shot after being pulled back to 2 meters.
Demo: Block on elastic band for different lengths.

10. Mixed Problem
Find the kinetic energy of a 1000kg car that is traveling 30m/s?
2) If the same car is to coast up a hill, how far can it vertically make it?
3) How far must a sling shot be pulled back to have the same energy as the car in problem number one of it has a spring constant of 90N/m?

13. Reflection Problem: A 10kg cart is pushed with a force of 20N for 5 meters. Use this information to find the missing potential energies , kinetic energies, heights and speeds for the following trip.

14. Warm-up: A car is traveling at a certain speed and it take 25 meters to stop the car with a constant force of 10N. Find the energy to stop the car.

15. Warm-up: A 1000kg rocket car is pushed with a force of 2000N for 200 meters. Find the following
Work done on rocket:
Type of energy the work turned into:
3) Kinetic energy of rocket: 4) Velocity of rocket:

16. Energy Quiz (5pts each)
Find the kinetic energy of rocket that has a 30N force applied to it for 20 meters.
What is the kinetic energy of a 1000kg meteor traveling at 9000m/s?
How much energy is required to lift a 300kg object 15 meters.
Find the elastic potential energy of a rubber band that has an elastic constant of 30N/m that is pulled back 2m.

17. Quiz: A student pulls down
Quiz: A student pulls down .2m on a rubber band and records a force of 29N. Find the following:
1) Spring Constant: k=F/x
2) Energy stored in rubber band.
3) If released, what type of energy will it turn into?
4) Find how high the rubber band will go.