1. Work, Energy, Power Friday, January 15, 2016

2. Friday, 1/15  On your warm-up respond to the following:  Take out your practice problem packet from Monday/Wednesday  Refer to the diagram for questions 21 - 25  What is the kinetic, potential, and mechanical energy values for point E (last point in the diagram). Upcoming dates:  Wednesday, 1/13 – Work and energy quiz moved to Friday, 1/15  Monday, 1/18 – Martin Luther King Holiday  Wednesday, 1/20 – Work, power, energy quiz; quiz moved to Friday, 1/22  Wednesday, 1/20 – review due when the late bell rings. Review moved to Friday, 1/22  Friday, 1/22 – Work, power, energy test. Test moved to Monday, 1/25  Friday, 1/22 – last day to turn in any missing assignments for work, power, energy unit. Requirement moved to Monday, 1/25  See my website for additional important dates.

3. Work Energy Quiz – 15 minutes

4. Elastic Potential Energy  Read the information about potential energy  During your second reading, highlight the following words:  Spring  Elastic  Energy  Potential energy  Stretch  Compress  Force  Spring constant  Equilibrium position

5. Elastic Potential Energy Example A plastic bullet with a mass of.45 kg is put into a toy gun. The spring in the gun has a spring constant of 200 N/m. The spring is compressed.20 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

6. Practice problem 1 A plastic bullet with a mass of.20 kg is put into a toy gun. The spring in the gun has a spring constant of 100 N/m. The spring is compressed 4.0 x 10 -3 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

7. Practice problem 2 A plastic bullet with a mass of.35 kg is put into a toy gun. The spring in the gun has a spring constant of 300 N/m. The spring is compressed 6.0 x 10 -3 meters before the bullet is released. What is the potential energy of the bullet before the trigger is pulled?

8. Power  Read your CNs and highlight the following words: rate, work, time, increase, decrease.

9. Draw a illustration of Power  Share with your elbow partner

10. Analyze the graph  List two observations about the graph  What does the line in the graph represent.

11. Important to remember…  W = F * d  F = m * a

12. Example Problem #1

13. Partner Practice  Complete example problem #2 and #3.

14. Cool Down  What is the relationship between work and power?

15. Power Practice  No more than four to a group!

16. Power Lab Planning