Question

What Is Work? (pages 412–413)
1. In science, work is done when a(n) acts on an object
in the direction the object moves.
2. Circle the letter of the best answer. Is work being done on a barbell
when a weight lifter is holding the barbell over his head?
a. No, because the weight lifter isn’t moving.
b. Yes, because the weight lifter is exerting force.
c. No, because the barbell isn’t moving.
3. Is the following sentence true or false? A vertical force does work on an
object that is moving in a horizontal direction.
Calculating Work (pages 413–414)
4. In science, work that is done on an object can be described as the force
acting on the object multiplied by the the object moves.
5. Circle the letter of the correct form of the work equation to use when
determining the distance an object moves as a result of a force applied to it.
a. Distance � Force � Work
b. Distance �
c. Distance � Work
Force
Force
Work
Physical Science Reading and Study Workbook Level B ■ Chapter 14 161
Copyright © by Savvas Learning Company LLC. publishing as Savvas Prentice Hall. All rights reserved.



Name ___________________________ Class ___________________ Date _____________
Chapter 14 Work, Power, and Machines
162 Physical Science Reading and Study Workbook Level B ■ Chapter 14
Copyright © by Savvas Learning Company LLC. publishing as Savvas Prentice Hall. All rights reserved.
6. The SI unit of work is the .
7. Circle the letter of the amount of work done when a 1 newton force
moves an object 1 meter.
a. 1 newton per second
b. 1 joule
c. 1 watt
What Is Power? (page 414)
8. Is the following sentence true or false? Power is the rate of doing work.
9. Circle the letter of each sentence that is true about power.
a. You can increase power by doing a given amount of work in a shorter
period of time.
b. When you decrease the force acting on an object, the power increases.
c. When you do less work in a given time period, the power decreases.
Calculating Power (page 415)
10. Circle the letter of the word equation that describes how to
calculate power.
a. Power equals work divided by time.
b. Power is a relationship between work and time.
c. Power equals the rate of work.
11. The SI unit of power is the .
12. Circle the letter of the expression that is equivalent to one watt.
a. one joule per meter
b. one newton per second
c. one joule per second
James Watt and Horsepower (page 416)
13. Circle the letter of the quantity that is approximately equal to
one horsepower.
a. 746 J
b. 746 W
c. 7460 N/m

Answer 1

1. force

2. c

3. False

4. distance (or displacement)

5. c (Distance = Work ÷ Force)

6. joule (J)

7. b

8. True

9. a and c

10. a

11. watt (W)

12. c

13. b