1. Chapter 4 Lesson 1 and 2 worksheets

2. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

3. How can the gravitational potential energy of an object be changed?
Chapter 4 Lesson I
Question 2
How can the gravitational potential energy of an object be changed?

4. Raise it to a great height.
Chapter 4 Lesson I
Raise it to a great height.
Question 2
How can the gravitational potential energy of an object be changed?

5. Energy is stored in the ch3mical bonds in the food molecules.
Chapter 4 Lesson I
Energy is stored in the ch3mical bonds in the food molecules.
No, The energy is stored in the chemical bonds in the octane, gasoline, molecule
Question 3
How is energy stored in food?
is the form of energy stored in food different from the form of energy stored in gasoline?

6. Potential energy is the energy given to an object due to its height.
Chapter 4 Lesson I
Kinetic is the energy contained in a moving object by virtue of its velocity and mass.
Potential energy is the energy given to an object due to its height.
Question 4
Contrast potential and kinetic energy.

7. Most PE= D Least PE= C Question 5
Chapter 4 Lesson I
Most PE= D
Least PE= C
Question 5
Which ball as the greatest potential energy? ___________ the least _________

8. Truck>car>bicycle
Chapter 4 Lesson I
Truck>car>bicycle
Question 6
A dump truck, a sports car, and a bicycle are traveling at the same velocity. Compare their kinetic energies.

9. Chapter 4 Lesson I
7.The only way Ms. Stayner’s 12 year old Honda can go more than 52 mph is to roll down a mountain. If the Honda has a mass of 1300 kg and its velocity is 45 m/s, what is its kinetic energy?
Given
Work
Answer
M= 1300 kg
V=45 m/s
KE= ½ mv2
KE= ½ (1300) (45)(45)
1,316,250 J

10. Chapter 4 Lesson I
8.Your physical science textbook is dusty and on a shelf 3 m from the floor. It is sad that you don’t spend quality time with it. If its mass is 1.25 kg, what is its gravitational potential energy? Would the GPE be more or less if the same book were on a shelf 4 m from the ground?
Given
Work
Answer
M= kg
G= 9.8 m/s/s
H= 4 m
PE= mgh
PE= (1.25) 9.8(4)
49 J

11. Chapter 4 Lesson 2
The mechanical energy of any object is the sum of the potential energy and the kinetic energy. At the top of the long track the car has mostly potential energy, which will change to kinetic energy as the car goes down the hill.
Question 1
Explain mechanical energy and describe the mechanical energy of a roller coaster car immediately before it begins traveling down a long track.

12. Chapter 4 Lesson 2
Energy is neither created or destroyed during a change. It remains constant.
Question 2
What is the law of conservation of energy?

13. Friction causes the brake pads to heat up.
Chapter 4 Lesson I
Friction causes the brake pads to heat up.
Question 3
Applying bicycle brakes as you ride down a long hill causes the brake pads and wheel rims to feel warm. Explain.

14. Chapter 4 Lesson I
In the sun and in the center of the earth. That’s why there is molten rock in the earth’s core.
Question 4
Where do nuclear fusion and fission reactions occur naturally?

15. Chapter 4 Lesson I
Some of the mass in the nucleus is changed to energy. A small amount of mass can create a great amount of energy. This is done according to Einstein’s equation, E=mc2
Question 5
How is mass converted into energy in nuclear fission? 5

16. Chapter 4 Lesson I
6. Riley runs the bases with a blazing velocity of 1 .3 m/s with a massive mass of 18 kg. What is his kinetic energy?
Given
Work
Answer
M= 18 kg
V= 1.3 m/s
KE= ½ mv2
KE= ½ (18) (1.3)(1.3)
15 J

17. Chapter 4 Lesson I
7Your mom wants you to clean your room which includes doing your yearly dusting. I know it has been since last year that you looked on top of your bookcase. As you climb the 4.25 m to get a look at the top you find the Mt. Dew that you hid from your little brother. The soda, can, and growth of mold combine to .78 kg. What is its GPE?
Given
Work
Answer
M= 0.78 kg
G= 9.8 m/s/s
H= 4.25 m
PE= mgh
PE= (.78) 9.8(4.25)
32 J

18. Chapter 4 Lesson I
Question 2

19. Chapter 4 Lesson I
Question 2

20. Chapter 4 Lesson I
Question 2

21. Chapter 4 Lesson I
Question 2

22. Chapter 4 Lesson I
Question 2

23. Chapter 4 Lesson I
Question 2

24. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

25. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

26. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

27. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

28. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

29. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

30. The one with the greater mass, because KE=1/2 mv2
Chapter 4 Lesson I
The one with the greater mass, because KE=1/2 mv2
Question 1
Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?