1. Motion Intro Questions
During the “Waiter Water Relay” what happened to the motion of the water if you changed your speed or direction quickly?
During the water relay, what caused the water to spill from the cup when you increased or decreased your speed?

2. Read to Understand
Read the following information and answer the summary questions as you go.
Answer the 3 “Thinking about Energy” questions when you are finished.
You have 10 minutes for this first Section!
stopwatch

3. Read to Understand 1
The water has potential energy because it is above the ground and has the potential to begin moving if the dam is opened.

4. Read to Understand 2
A ping pong ball that is 10 m off the floor has more potential energy because it has farther to fall.

5. Read to Understand 3
If two objects weigh the same amount, the one moving fastest has the most kinetic energy because it has a higher velocity.

6. Thinking About Energy
1. Which of the following has the most kinetic energy?
a. car traveling at 30 miles per hour
b. car traveling at 60 miles per hour
c. car parked on top of a 50 foot hill
d. car parked on top of a 70 foot hill

7. Thinking About Energy
The drawing shows an apple tree with one apple falling off a branch. What kind of energy change does the drawing to the right show?
a. kinetic to potential
b. kinetic to chemical
c. potential to kinetic
d. heat to kinetic

8. Thinking About Energy
Which of the following best describes the energy change that occurs when a stretched rubber band is suddenly released?
a. kinetic  potential
b. potential  kinetic
c. mechanical  potential
d. kinetic  mechanical

9. Using formulas to understand Kinetic and Potential Energy

10. Kinetic Energy
Units = Joule (J)

11. Potential Energy
g = 9.8 m/s2
Units = Joule (J)

12. Example 1
A 50-kilogram boy and his 100-kilogram father went jogging. Both ran at a rate of 5 m/s. Who had more kinetic energy?

13. Example 2
What is the potential energy of a 10-kg book that is placed on a shelf that is 2.5 meters high?

14. Example 3
Which student has more potential energy?

15. Example 4
If both students jumped at the same time, which one would have more kinetic energy at the water?

16. HOMEWORK!! 2-SIDED PE and KE HALF sheet! DUE FRIDAY…
So is your LAB REPORT!!!