1. Types of Potential Energy

3. Avalanche Questions Where did the energy of the avalanche come from?
Where did it go?

4. Energy Conversion Energy can be converted from one form to another
Energy conversion is the process of this change

5. Conservation of Energy
Law of Conservation of Energy
Energy cannot be created nor destroyed
Energy changes from one form to another, but the total amount of energy remains unchanged

6. Energy Transformation
Each time energy is transformed, all of the energy can be accounted for—none of the energy is lost!

7. Two General Types of Energy
Kinetic Energy
Potential Energy
Energy of Motion
Energy that is stored as a result of position or shape
Energy with the potential to do work
Examples:
Lifting a book in the air
Plucking a string

10. Mechanical Energy The sum of kinetic and potential energy of a system
EXAMPLE – Pendulum

11. Types of Energy
Review Game

12. #1

13. #2

14. #3

15. #4

16. #5

17. #6

18. #8

19. #9

20. #10

21. #11

22. #12

23. Drop Height v. Height of Can
(cm)
Height of Can (cm)

24. Mass v. Height of Can
Mass
(g)
Height of Can (cm)
MYSTERY MASS

25. Analysis Questions
What factors affect the amount of gravitational potential energy an object is storing?
What is the relationship between GPE and height? Between GPE and mass?
Which can crusher situation would have the most GPE? The least GPE?

26. Gravitational PE
Energy is stored as the result of the gravitational attraction of the Earth for the object.
Depends on TWO factors
1. Mass of an Object
2. Height above the surface of Earth
Relationship Between GPE and Mass
As mass of an object increases, the GPE of the object increases
Relationship Between GPE and Height
As the height of an object above ground increases, the GPE of the object increases

27. GPE
Maximum GPE
Increasing
GPE
Decreasing
GPE

32. Gravitational PE Practice Problems#1 #2
Who has greater GPE: a diver standing on a 10m diving board OR a diver standing on a 15m diving board?
If a diver is standing on the ground. What is her gravitational PE? Why?

33. Meteor Crater in Arizona

34. Manicouagan in Quebec, Canada

35. Chicxulub on the Yucatan coast in Mexico

36. Quick Video! https://www.youtube.com/watch?v= YzFDCsCscyo
Think about the types of PE acting on the bouncy balls in this video.
Where does the energy come from? Where does it go?
Why do the bouncy balls eventually come to a stop?

37. PLICKER!
Green, Yellow, Red

38. Elastic Potential Energy
Energy stored in elastic materials as the result of their stretching or compressing
A change in the amount of compression or stretch of an elastic object is evidence that the elastic potential energy has changed.
Example: When you stretch a rubber band, the elastic potential energy of the rubber band increases. This stored energy can cause the rubber band to fly across the room when you let it go.

39. Elastic PE
Butterfly Demonstration
Marshmallow Launcher Demonstration

41. Windup Toy Demonstration
When you wind up the windup toy, potential energy is stored in its spring. As you wind the spring tighter and tighter, the spring holds more potential energy. The kind of potential energy in the spring of a windup toy is elastic potential energy. Elastic potential energy is stored when something “stretchy” or “springy” is stretched or compressed. When you wind up the windup toy, you compress its spring. When you let go, the spring unwinds, and the toy moves.

42. Energy Transformations

43. PLICKER!

44. Chemical PE
The energy stored in bonds between the atoms that make up matter
Chemical potential energy can be released during chemical reactions when these bonds are broken
Examples:
1. You get energy by eating because food contains chemical potential energy. Your body breaks down bonds between atoms when you digest food. The process of breaking down food converts the CPE stored in food to other types of energy your body needs in order to function.
2. Fossil fuels have CPE. CPE is released when fossil fuels such as gasoline are burned.

45. Magnetic PE
Magnetic potential energy is associated with the position of magnetic objects relative to each other
Magnetic force weakens rapidly with increasing distance
This means that as two magnets move farther away from one another, the magnetic force acting on them decreases
OR as a magnetic material is moved farther away from a magnet, the magnetic force acting on the magnetic material decreases

46. Electrical PE
Charged particles are particles that have either a positive (+) or negative (-) electrical charge.
Depends on TWO factors
Amount of electrical charge an object has
Distance between charged particles
A change in the position of charged particles relative to each other is evidence of a change in electrical potential energy.