Chapter 4 Lesson 1 and 2 worksheets

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

Question 2How can the gravitational potential energy of an object be changed?

Chapter 4 Lesson I•Raise it to a great

height.Question 2How can the gravitational potential energy of an object be changed?

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 3How is energy stored in food?

is the form of energy stored in food different from the form of energy stored in gasoline?

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.

Chapter 4 Lesson I • Most PE= D

• Least PE= C

Question 5Which ball as the greatest potential energy? ___________ the least _________

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

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 kgV=45 m/s

KE= ½ mv2

KE= ½ (1300) (45)(45)

1,316,250 J

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= 1.25 kgG= 9.8 m/s/sH= 4 m

PE= mghPE= (1.25) 9.8(4)

49 J

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.

Chapter 4 Lesson 2

• Energy is neither created or destroyed during a change. It remains constant.

Question 2What is the law of conservation of energy?

Chapter 4 Lesson I

• Friction causes the brake pads to heat up.

Question 3Applying bicycle brakes as you ride down a long hill causes the brake pads and wheel rims to feel warm. Explain.

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 4Where do nuclear fusion and fission reactions occur naturally?

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 5How is mass converted into energy in nuclear fission? 5

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 kgV= 1.3 m/s

KE= ½ mv2

KE= ½ (18) (1.3)(1.3)

15 J

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 kgG= 9.8 m/s/sH= 4.25 m

PE= mghPE= (.78) 9.8(4.25)

32 J

Chapter 4 Lesson I

Question 2

Chapter 4 Lesson I

Question 2

Chapter 4 Lesson I

Question 2

Chapter 4 Lesson I

Question 2

Chapter 4 Lesson I

Question 2

Chapter 4 Lesson I

Question 2

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?

Chapter 4 Lesson I

• The one with the greater mass, because KE=1/2 mv2

Question 1Two books with different masses fall off the same bookshelf. As they fall which has more kinetic energy and why?