CHAPTER 4 SECTION 1 Work and Power

1. What is work? A. The type of energy that a moving object has B. The rate at which work is done or energy is transformed C. The unit used to express power D. The transfer of energy using a force that causes an object to move in the direction of the force E. The unit used to express energy

ANSWER: Work is… D. The transfer of energy using a force that causes an object to move in the direction of the force

2. What is power? A. The type of energy that a moving object has B. The rate at which work is done or energy is transformed C. The unit used to express power D. The transfer of energy using a force that causes an object to move in the direction of the force E. The unit used to express energy

ANSWER Power is… B. The rate at which work is done or energy is transformed

3. What is kinetic energy? A. The type of energy that a moving object has B. The rate at which work is done or energy is transformed C. The unit used to express power D. The transfer of energy using a force that causes an object to move in the direction of the force E. The unit used to express energy

ANSWER Kinetic energy is … A. The type of energy that a moving object has

4. What is a joule? A. The type of energy that a moving object has B. The rate at which work is done or energy is transformed C. The unit used to express power D. The transfer of energy using a force that causes an object to move in the direction of the force E. The unit used to express energy

ANSWER A joule is… E. The unit used to express energy

5. What is a watt? A. The type of energy that a moving object has B. The rate at which work is done or energy is transformed C. The unit used to express power D. The transfer of energy using a force that causes an object to move in the direction of the force E. The unit used to express energy

ANSWER A watt is… C. The unit used to express power

6. What is the equation used to calculate work? A. W / t B. F x d C. L x w D. L x w x h

ANSWER The equation for work is … B. F x d

7. What is the equation to calculate power? A. W / t B. F x d C. L x w D. L x w x h

ANSWER The equation for power is … A. W / t

8. In which situation is a person doing work on an object? A.A school crossing guard raises a stop sign that weighs 10 N. B.A student walks while wearing a backpack that weighs 15 N. C.A man exerts 350 N force on a rope attached to a house. D.A worker holds a box 1 m off the floor.

ANSWER A.A school crossing guard raises a stop sign that weighs 10 N.

9. Scott applies a force of 100 N to move a box 5 meters. How much work did he do? A.100 J B.500 J C.5 J D.500 N

ANSWER B.500 J

10. If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it? A.The shape of the weights B.The height the barbell is being lifted C.The strength of the person doing the lifting D.The amount of output force

ANSWER B.The height the barbell is being lifted

11. Tom used 75 N of force to push a box 3 m across the floor. How much work did he do? a. 25 J b. 25 N c. 225 J d. 225 W

ANSWER 75 N x 3 m = c. 225 J

12. What is the power of a small motor that can do 2500 J of work in 25 seconds? a. 100 W b. 100 N c. 62,500 W d. 10 N

ANSWER 2500 J / 25 s = a. 100 W

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11/15 WRITING TASK (do in Learning Log) DOK LEVEL 2/3 QUESTION: How did scientists finally figure out the ancestry of different dog breeds? Use text evidence to support your answer.