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Work and Power

Total questions: 73

Worksheet time: 1hrs 12mins

Name
Class
Date
1.
Which of the following is a true statement about work?
a)
It measures how quickly an object accelerates 
b)
It measures how much effort is applied over a certain distance
c)
It measures the change in an object's rate of speed
d)
It measures how much time it takes to move a massive object
2.
What does one newton exerted over a distance of one meter equal?
a)
One watt
b)
One hertz
c)
One volt 
d)
One joule 
3.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

4.
The rate at which work is done.
a)
Joules
b)
Power
c)
Watts
d)
Newtons
5.
A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 
a)
77 J
b)
7.7 J 
c)
0.7 J 
d)
770 J 
6.
A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?
a)
600 J 
b)
660 J
c)
900 J 
d)
1200 J 
7.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
8.
You do 90 joules of work in 30 seconds. How much power have you generated?
a)
30 watts
b)
3 watts
c)
120 watts
d)
270 watts
9.
You move an 8-newton weight five meters in 4 seconds. How much power have you generated?
a)
160 watts
b)
10 watts
c)
6.4 watts
d)
17 watts
10.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
11.
How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?
a)
3.8 m
b)
3.7 m
c)
3.2 m
d)
3.6 m
12.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
13.
How much power is the  tractor that drags a plow with a force of 500 N a distance of 10 meters in 20 seconds?
a)
250 Watts
b)
250 Joules
c)
100,000 Watts
d)
100,000 Joules
14.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
15.
If a group of workers can apply a force of 1,000 Newtons to move a crate 20 meters, what amount of work will they have accomplished?
a)
20,000 J
b)
200 J
c)
2,000 J
d)
20 J
16.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
17.
How much time is needed to produce 720 Joules of work if 90 watts of power is used? 
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
18.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
19.
P=25 watts 
W=5000 Joules 
t=???
a)
200 sec
b)
0.0005 s
c)
125000 s
d)
125 s
20.
What is the potential energy done in lifting a 50kg barbell 5.8m above the floor?
a)
50J
b)
9.81J
c)
2845J
d)
58J
21.

If you move a 2N chair 30 meters, how much work have you done?

a)

6J

b)

60J

c)

600J

d)

15J

22.

Mr. Ben took 6 seconds to move a 71N stack of paper 7m up the stairs, how much power did he produce?

a)

123.4 Watts

b)

546 Watts

c)

82.8 Watts

d)

32.2 Watts

23.

Sofi carries a 345N baby elephant across a field that is 56m long. How much work did she do?

a)

12J

b)

19320J

c)

5555.5 J

d)

16924 J

24.

Chiu Chiu carries a pair of stinky socks from her room to the laundry room. The socks have a weight of 322N, and she carries them 5M. The trip took 23 seconds. How much power did she use?

a)

56 Watts

b)

32 Watts

c)

324 Watts

d)

70 Watts

25.

Patty pushes a chair with a force of 40N for 3m. How much work did she do?

a)

120J

b)

30J

c)

180J

d)

40J

26.

You move a cabinet with a force of 70N for 5 meters. It takes 2 seconds to do this. How much power have you generated?

a)

88 Watts

b)

175 Watts

c)

120 Watts

d)

39 Watts

27.

It took Jake 10 seconds to move a book with a weight of 10N for 5 meters. How much power did he use?

a)

10 Watts

b)

5 Watts

c)

50 Watts

d)

99 Watts

28.

If my school bag has a weight of 23 newtons and I carry it to my next class that is 100 meters away, how much work did I do?

a)

230 J

b)

23 J

c)

2300 J

d)

23000 J

29.

If Fadil uses 85 N of force to kick a sand bag 2 meters in 8 seconds, how much power did he create?

a)

1225 W

b)

2512 W

c)

25.12 W

d)

21.25 W

30.

Patty throws a pig with a force of 43N, 400 meters up in the air, how much work did she do?

a)

39482 J

b)

17200 J

c)

123700 J

d)

168560 J

31.

What is the unit for gravitational energy on earth?

a)

5.0

b)

3.14

c)

4.68

d)

9.81

32.

How many Watts are in 1 horsepower?

a)

600

b)

710

c)

745

d)

1000

33.

If mean Teacher Ben picked up a stack of tests with a weight of 1,000,000 N and handed them to the students that were 10 meters away, how much work did he do?

a)

10,000,000 J

b)

1,000,000 J

c)

100,000 J

d)

10,000 J

34.

If you push a desk that has a weight of 29N for 10 meters and it took you 5 seconds, how much power did you generate?

a)

290 Watts

b)

290 Joules

c)

58 Joules

d)

58 Watts

35.

What is the unit for work?

a)

Work that Mr. Ben gave us

b)

something that our parents tell us to do

c)

Joules

d)

Watts

36.

If An-Jiun uses 30N force to punch a bag 1.5 m in 2 seconds, how much power was created?

a)

90 Watts

b)

22.5 Watts

c)

20 Watts

d)

135 Watts

37.

A rock has a mass of 40kg. Mr Ben lifts it 3 meters. How much work did he do?

a)

120 J

b)

22,700 J

c)

126 J

d)

1176 J

38.

If Patty pulls 15N sled 35m in 15 seconds and Conner pull 15N sled 30m in 10seconds who does more work?

a)

Connor

b)

Patty

c)

They do the same

d)

Patty, because Conner doesn't do work

39.
Two factors that determine work are
a)
size of the force, and distance
b)
size of the force, and type of force
c)
mass, and distance
40.
if you push a cart with a force of 60 N for 2 m... how much work have you done
a)
120 J
b)
30 J
c)
120 N 
d)
30 N
41.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
42.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
43.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
44.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

45.

what would 1m be an example of?

a)

work

b)

power

c)

time

d)

distance

46.

what would 14J be an example of?

a)

work

b)

distance

c)

time

d)

force

47.

If you increase your work and decrease your time, you will have

a)

more power

b)

less power

c)

same amount of power

d)

power rating can not be determined

48.

If you have the same work as someone, but in less time

a)

You are more powerful

b)

You are less powerful

c)

You have the same power

49.

If you have the same work as someone, but in less time

a)

You are more powerful

b)

You are less powerful

c)

You have the same power

50.
If a tow truck does 1000 J of work in 5 seconds then what is the power being used?
a)
200 n
b)
2000 w
c)
2000 n
d)
200 w
51.

Ana, has a mass of 105 kg, is walking up a set of stairs that are 5 meters high. What is Ana's work?

a)

105 N

b)

4425 J

c)

1195.9 J

d)

5145 J

52.

If 10, 000 J of work is done by a bulldozer outputting 1000 N of Force, what is the displacement?

a)

10 m

b)

20 m

c)

100 m

d)

200 m

53.

How much work has been done on an object with a force of 2000 N being displaced 2 m?

a)

4000 J

b)

1,000 J

c)

40 J

d)

150 J

54.

How much power is used when a person has 100 kg moves 20 m over 2 seconds?

a)

19600 J

b)

9800 J

c)

9800 W

d)

0 W

55.

What is the work done when a person applies a force of 20 N on a box 10 m?

a)

2 J

b)

20 J

c)

200 W

d)

200 J

56.

What is the power acting on an object with a mass of 165 kg over 1000 m during 150 seconds?

a)

10, 780 J

b)

1, 617, 000 W

c)

10, 780 W

d)

5 W

57.

What is the time take to do work of 5000 J over 50 W

a)

120 seconds

b)

10 seconds

c)

100 seconds

d)

1000 seconds

58.

What is the power of an object that does 900 J of work over 15 seconds?

a)

60 W

b)

15 W

c)

10 W

d)

60 J

59.

ln the Empire State Building Run-Up, competitors race up the 1576 steps (86 flights) of the Empire State Building, climbing a total vertical distance of 320 m. How much work does a m 74 kg racer do?

a)

2.321 × 105 Joules

b)

2.326 × 105 Joules

c)

2.318 × 105 Joules

d)

2.317 × 105 Joules

60.

If a 74 kg racer took 798 s to climb the 320 m, how power did she developed?

a)

291 Watts

b)

281 Watts

c)

317 Watts

d)

313 Watts

61.

This weight lifter raised 105 kg to a height of approximately 2.31 m in 9 seconds. How much power did he developed?

a)

264 Watts

b)

1029 Watts

c)

2,377 Watts

d)

4,009 Watts

62.

A construction worker uses a pulley and a rope to raise an 85 kg person to a height of 2 m in 6 s. How much did he do?

a)

1,670 J

b)

833 J

c)

278 J

d)

417 J

63.

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will do the most work?

a)

Bro A

b)

Bro B

c)

They both will do the same work

d)

Can't tell without knowing the weight they are lifting

64.

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will supply the most power?

a)

Bro A

b)

Bro B

c)

They both will do the same work

d)

Can't tell without knowing the weight they are lifting

65.

Two movers applied a total force of 350 N to push chest up a ramp into a truck. If the work that they did 1,400 J, calculate the height of the ramp?

a)

4 m

b)

3 m

c)

2 m

d)

1 m

66.

750 J of work is done on a car jack to raise a car by 0.15 m. Calculate the upward exerted on the car.

a)

5,000 N

b)

113 N

c)

50 N

d)

11,300 N

67.

If this person supplies 81.2 W of power and does 637 J of work to do 5 reps, how much time does he take to do 5 reps?

a)

7.8 s

b)

8.0 s

c)

9.0 s

d)

5.8 s

68.

If he weighs 700 N and climbs at a constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the him to overcome gravity is most nearly

a)

1.1 Watts

b)

87.5 Watts

c)

560 Watts

d)

875 Watts

e)

5,600 Watts

69.

If you push a 20N laptop 1 meter and it took you 3 seconds, how much power did you generate?

a)

20 Watts

b)

60 Watts

c)

6.6 Watts

d)

6.6 Joules

70.

Anjiun pushes a shelf that weight 100N 5m. It took her 40 seconds to do this. Did she create more or less power than a 60-Watt light bulb ?

a)

More

b)

Less

c)

Same

d)

I have no idea

71.

How far did an object move if it has a weight of 20N and the total work was 100 Joules

a)

6m

b)

5m

c)

200m

d)

20m

72.

Fern pushes a 5N TV across the living room that is 500m long. How much work did she do?

a)

2500 J

b)

25 J

c)

100 J

d)

1000 J

73.

Khaofang got mad and threw her 50N phone. Her phone went a distance of 6.8m. How much energy did this take?

a)

34 J

b)

250 J

c)

300 J

d)

340 J

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