1. Work, Energy, Power Wednesday, January 13, 2016

2. Wednesday, 1/13  On your warm-up respond to the following:  Take out your Work and Energy CNs.  Answer the essential question.  If you have completed your practice questions from Monday, show me as I am stamping warm-ups and I will change your grade. Upcoming dates:  Wednesday, 1/13 – Work and energy quiz  Monday, 1/18 – Martin Luther King Holiday  Wednesday, 1/20 – Work, power, energy quiz  Wednesday, 1/20 – review due when the late bell rings.  Friday, 1/22 – Work, power, energy test  Friday, 1/22 – last day to turn in any missing assignments for work, power, energy unit.  See my website for additional important dates.

3. Energy Lab – Pre-lab  Review instructions with your group  Familiarize yourself with the equipment  Understand your output (summary questions and graphing)

4. Energy Lab – 25 Minutes

5. Finish Practice problems

6. Work Energy Quiz – 15 minutes

7. Cool Down  Describe the relationship between ME, PE, KE as the cart in the lab moved down the ramp.

8. 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

9. 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?

10. 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?

11. 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?

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

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

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

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

16. Example Problem #1

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

18. Summarize