1. Kinetic and Potential Energy
It’s “Natural Money”

2. From the Parable of the Lost Penny

3. Conservation of Energy

4. Kinetic and Potential Energy

5. Kinetic and Potential Energy

6. QuickCheck 10.1
A child is on a playground swing, motionless at the highest point of his arc. What energy transformation takes place as he swings back down to the lowest point of his motion?
K  Ug
Ug  K
Eth  K
Ug  Eth
K  Eth
Answer: D
Slide 10-27 6

7. QuickCheck 10.1
A child is on a playground swing, motionless at the highest point of his arc. What energy transformation takes place as he swings back down to the lowest point of his motion?
K  Ug
Ug  K
Eth  K
Ug  Eth
K  Eth
Answer: D
Slide 10-27 7

8. Energy Bar Charts A pebble is tossed up into the air.
The simple bar charts below show how the sum of K + Ug remains constant as the pebble rises and then falls.
Slide 10-34

9. QuickCheck 10.4
Rank in order, from largest to smallest, the gravitational potential energies of the balls.
1 > 2 = 4 > 3
1 > 2 > 3 > 4
3 > 2 > 4 > 1
3 > 2 = 4 > 1
Answer: D
Slide 10-38 9

10. QuickCheck 10.4
Rank in order, from largest to smallest, the gravitational potential energies of the balls.
1 > 2 = 4 > 3
1 > 2 > 3 > 4
3 > 2 > 4 > 1
3 > 2 = 4 > 1
Answer: D
Slide 10-39 10

11. Gravitational Potential Energy on a Frictionless Surface
The total mechanical energy for a particle moving along any frictionless smooth surface is conserved, regardless of the shape of the surface.
Slide 10-48

12. QuickCheck 10.5
Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. For which is it going faster at the bottom?
Faster at the bottom of the steeper hill.
Faster at the bottom of the less steep hill.
Same speed at the bottom of both hills.
Can’t say without knowing the mass of the marble.
Answer: D
Slide 10-49 12

13. QuickCheck 10.5
Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. For which is it going faster at the bottom?
Faster at the bottom of the steeper hill.
Faster at the bottom of the less steep hill.
Same speed at the bottom of both hills.
Can’t say without knowing the mass of the marble.
Answer: D
Slide 10-50 13

14. QuickCheck 10.7
Three balls are thrown from a cliff with the same speed but at different angles. Which ball has the greatest speed just before it hits the ground?
Ball A.
Ball B.
Ball C.
All balls have the same speed.
Answer: D
Slide 10-57 14

15. QuickCheck 10.7
Three balls are thrown from a cliff with the same speed but at different angles. Which ball has the greatest speed just before it hits the ground?
Ball A.
Ball B.
Ball C.
All balls have the same speed.
Answer: D
Slide 10-58 15

16. FRQ Practice