1. PE and KE Energy!

3. Potential Energy (PE)
What is potential? Examples of using the term “Potential”
You have the potential to do well on the Ch. 3 Test
The Cubs had the potential to make it to the World Series
Definition: anything that may be possible to DO something
Potential energy is STORED ENERGY due to its position, shape, or state
This is called potential energy
It has the potential to cause a change

4. Potential Energy Stored
Gravitationally
Question:
A bowling ball sits on a table.
If it rolled off, how much damage could it do to your foot?
What things could change about the ball so that it might
cause more or less damage on my foot?
Factors that effect PE
-height
-gravity
-mass
PE = m∙g∙h

5. PE = mgh Complete the table below by finding the potential energy.
MASS GRAVITY HEIGHT P.E.
5 kg _____ 1 meter ____J
5 kg _____ 2 meters ____J
5 kg _____ 10 meters ____J
5 kg _____ 20 meters ____J
As height increases? Is PE increasing? Are they proportional? Directly proportional?
9.8 m/s2

6. PE = mgh
What is the PE of an egg with a mass of 0.5 kg that is held at a height of 3 m.? G U E S

7. PE = mgh
What is the mass of a car that is 6 m off the ground and has a PE of 72,000 J ? G U E S

8. Kinetic Energy Motion KE = ½ m ∙ v2 The Energy of KE depends on:
Velocity
Mass
KE = ½ m ∙ v2

9. Complete the table below by finding kinetic energy:
MASS VELOCITY KINETIC ENERGY
1 kg 2 m/s _______ J
2 kg 2 m/s _______J
4 kg 2 m/s _______J
8 kg 2 m/s _______J
As mass increases, is KE increasing? Are they proportional? Directly proportional?

10. Complete the table to find the kinetic energy:
MASS VELOCITY KINETIC ENERGY
4 kg 1 m/s ______J
4 kg 2 m/s ______J
4 kg 4 m/s ______J
4 kg 8 m/s ______J
Is velocity increasing? Is KE increasing? Are they proportional? Directly proper ional?

11. What is the KE of a cart that has a mass of 48 kg and a velocity of 3 m/s.?U E S

12. What is the mass of a bowling ball moving at 10 m/s that has a KE of 800J. ?U E S

13. 60 mph? ____________________
Which has a greater kinetic energy – a truck traveling at 30 mph or a Beetle car traveling at
60 mph? ____________________
1x’s mass x mph = ________J of KE
2x’s mass x mph = _________ J of KE

14. Law of Conservation of Energy
Total Energy
What did you notice about the TOTAL energy bar graph?
Total amount of energy remains constant
2 Parts:
Energy Transfers
Cannot create or destroy Energy
Total Energy = KE + PE

15. Forms of energy Ep Ek Eel Ec Et ET Potential energy Kinetic energy
Elastic energy
Chemical energy
thermal energy
Total energy

16. Energy changes from E?... to E?…

18. https://phet.colorado.edu/en/simulation/energy-skate-park

22. TOTAL amount of energy remains CONSTANT

23. Law of Conservation of Energy
Energy cannot be created or destroyed:
It can be transformed (changed)
from one form to another,
But the TOTAL amount of energy
Always stays the SAME.

24. Law of Conservation of Energy

25. Determine the amount of PE at each position

26. A 0.5 kg ball rolling down the frictionless ramp.
KE PE Eel ET
KE PE Eel ET
KE PE Eel ET
PE = _____
KE = _____ Total E = _____

27. LOL Diagrams
KE PE Et ET
KE PE Et ET
KE PE Et ET X X X

28. Bell work: 11/30 A B C D KE PE Et ET KE PE Et ET KE PE Et ET4
PE = _____ PE = _____ PE = _____ PE+KE = _____
KE = _____ KE = _____ KE = _____ Et = _____
Total E = _____ Total E = _____ Total E = _____ Total E = _____ 2 4 4 4

29. Ramp Lab Part 1:
height
Stopping distance
height

30. Energy Ramp Lab: Part 1
If we elevate the position of a ball, we give it PE.
Raise it twice as high and it has twice the energy.
Another way of saying it has twice the energy is to say it has twice the ability to cause a change in another object.
In sliding down a ramp, it creates thermal energy due to friction. The question is raised: Will it skid twice as far if it has twice the energy before it comes to a stop?
Q: What will be the stopping DISTANCE of a marble if we were to release it from a greater HEIGHT (giving it more PE)?

31. Energy Ramp Lab 0.40 m Height 1.50 m 1.20 m .90 m .60 m .30 m 0 m
PE = _____ PE = _____ PE = _____ PE = _____ PE = _____ PE = _____
KE = _____ KE = _____ KE = _____ KE = _____ KE = _____ KE = _____

34. Energy Ramp Lab 0.40 m Height 1.50 m 1.20 m .90 m .60 m .30 m 0 m
PE = _____ PE = _____ PE = _____ PE = _____ PE = _____ PE = _____
KE = _____ KE = _____ KE = _____ KE = _____ KE = _____ KE = _____

35. Graph of Data Table A
Distance (m)
Distance vs. Height
Height (m)

36. Question 1
Based on your data, state the relationship between height and distance:
Distance vs. Height
Average Distance (m)
Height (m)

37. Energy Ramp Lab Results
What is the relationship between HEIGHT and stopping distance?
If the TOTAL energy of marble is J, what is the potential energy half-way down the ramp?
What is the KE at the bottom of the ramp?

38. Part 2 Purpose
Q: What will happen to the stopping DISTANCE of the marble if we were to release it from a greater INCLINE (steeper slope)?
20 cm
Angle °
Angle °
Angle °
Angle °
distance

40. Graph of Data Table C
Distance (m)
Distance vs. Angle
Angle (degrees)

41. Part 2 So… does the angle of the incline affect the distance?
Distance vs. Angle (slope))

42. Analysis:
Does your graph from Data Table A indicate that height of release is directly proportional to the stopping distance? (In other words, does twice the release height give twice the stopping distance? Check your graph to see)
In terms of ENERGY, (PE, KE and total) interpret your results from the graph of Data Table C – How did the angle of the ramp relate to the stopping distance of your marble. Explain.
Describe why we are able to calculate the Kinetic Energy of the ball (Data Table B) even though we did not know the velocity of the ball at each location.
4. What happens to (KE) energy as the marble rolls on the carpet?
5. Although we did not measure or calculate the velocity of the marble, how would the SPEED of the marble compare at the bottom of the ramp each time you changed the angle in Part 2? (*use the equation s = d x t to guide your thinking).

43. Energy quiz

44. Now you play! http://www.gamegecko.com/game/594/ramps Ramps Game!