1. Do Now Make sure your homework & extra credit are in the bin!
Weekly Reflection Time  Write about any of the following:
How has 2013 been treating you?
Inauguration Day is Sunday! What are you excited about for the next Obama term?
What would be your perfect snow day?
If you could go back in time, what year would you go to and what would you do?

2. Today’s Agenda Do Now Important Dates Pendulums Quiz Practice Test
5 min
Do Now
Important Dates
15 min
Pendulums
10 min
Quiz
Practice Test

3. Important Dates & Reminders
Unit Exam next Friday!
Will have tutoring next Wednesday
Practice Test Due Next Wednesday
January Monthly News Projects
Roller Coaster Lab Materials
No School Monday – Happy MLK DAY 
Next Home Basketball Game

4. Pendulums When does this pendulum have only potential energy?
When does it have only kinetic energy?

5. Pendulums
The energy switches back and forth between these two types of mechanical energy but TOTAL mechanical energy always stays constant

6. Video Recap
Bill Nye Energy Vidoe
This short video gives an overview of Law of Conservation of Energy related to pendulums

7. Check for Understanding
As the pendulum swings from position A to position B, what happens to its potential energy?
Decrease
Increase
Remain Constant

8. Check for Understanding
As the pendulum swings from position A to position B, what happens to its kinetic energy?
Decrease
Increase
Remain Constant

9. Check for Understanding
As the pendulum swings from position A to position B, what happens to its total mechanical energy?
Decrease
Increase
Remain Constant

10. Check for Understanding
Which statement is true about this swinging pendulum?
The potential energy at A equals the kinetic energy at C.
The potential energy at A equals the kinetic energy at B.
The speed of the pendulum at A equals the speed of the pendulum at B.
The potential energy at B equals the potential energy at C.

11. Check for Understanding
If a pendulum is displaced, giving it a potential energy of 5 J, what will be the maximum kinetic energy it attains?
0 J
2 J
2.5 J
5 J

12. Law of Conservation of Energy Quiz
You have 10 minutes to silently & independently complete the quiz.

13. Practice Test
Take the next 10 minutes to begin working on your practice test and ask questions!