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Work & Power

Total questions: 48

Worksheet time: 52mins

Name
Class
Date
1.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
2.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
meter
3.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
4.
What is work?
a)
A push or pull.
b)
When the object moves in the same direction in which the force is exerted.
c)
A change in energy.
d)
The rate at which energy is transferred.
5.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
6.
Which is doing work?
a)
pushing a wall
b)
holding a box
c)
picking up a pencil
d)
sitting in a chair
7.
An example of work is holding a heavy bag.
a)
True
b)
false
8.
Work is a measurement of how much force is applied over a certain
a)
distance
b)
velocity
c)
shape
d)
size
9.
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
10.
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
11.
Fred kicks a ball with a force of 20N to George, who is 5M away. How much work was done to the ball?
a)
25J
b)
100J
c)
4J
d)
75J
12.
What is work?
a)
Force x Distance
b)
Force / Distance
c)
Distance / Force
d)
Force + Distance
13.

You have to push with 15 N of force to move it 10 meters. How much work do you do?

a)

15 Joules

b)

150 Joules

c)

1.5 Joules

d)

.67 Joules

14.

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

a)

10 m

b)

0.1 m

c)

25,000 m

d)

10 J

15.

You exert 200 J of work by pulling on an object with 20 N of force. What distance is the object moved?

a)

.01 m

b)

10 m

c)

10 J

d)

4,000 m

16.

You do 40 Joules of work in 8 seconds. How much power did you exert?

a)

0.2 watts

b)

320 watts

c)

5 watts

17.
Which person moves the barrel a greater distance?
a)
Left 
b)
Right 
c)
Both 
d)
Neither, they are doing the same amount of work.  
18.
Which person uses the greatest force on the barrel?
a)
Right
b)
Left
c)

Neither; they are doing the same amount of Force.

19.
Which person is doing more work?
a)
Left 
b)
Right 
c)
Both
d)
Neither; they are doing the same amount of work.
20.

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has she done?

a)

600 J

b)

450 J

c)

900 J

d)

1200 J

21.

50 J of work is done lifting a 20.0 N book in the air. How high was it lifted?

a)

2.5 m

b)

3.5 m

c)

0.4 m

d)

25 m

22.
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
23.
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
24.
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 
25.

A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?

a)

200 J

b)

80 J

c)

5 J

d)

2000 J

26.

A cannon shoots a 1000 N stunt performer 100 m. How much work is done on the performer?

a)

100,000 J

b)

10,000 J

c)

10 J

d)

1,000,000 J

27.

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

28.

Fred kicks a ball with a force of 20N to George, who is 5M away.


How much work was done to the ball?

a)

25 J

b)

100 J

c)

4 J

d)

75 J

29.

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

a)

8000 J

b)

8000 N

c)

4000 J

d)

2000 J

30.

If the mystery machine moves 100 meters how much work is done?

a)

130,000,000 J

b)

70,000 J

c)

100,000 J

d)

30,000 J

31.

If Jay Loppy pushes his van 20 meters how much work is done?

a)

2,000 J

b)

40,000 J

c)

10,000 J

d)

800,000 J

32.
The SI Unit for Power
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
33.

What is the formula for Work?

a)

E=mc2

b)

W= F x d

c)

P = W/t

34.
W = 500 Joules 
t = 25 seconds
P = ???
a)
0.05 W
b)
20 W
c)
12500 W
d)
2000 W
35.

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

36.

While rowing across the lake during a race, John does 3960 J of work on the oars in 60 seconds. What is his power output?

a)

56W

b)

100W

c)

66W

d)

None of the answers are correct

37.

A mountain climber with a force of 90 N scales a 100 m cliff. How much work is done by the mountain climber?

a)

1.11 W

b)

90,000 J

c)

0.9 J

d)

9 W

38.

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

39.
Is the amount of energy being transferred over a period of time.
a)
Power
b)
Energy
c)
Seconds
d)
Joules
40.
What is the difference between calculating power and work?
a)
Power takes into account the time it takes to complete a task
b)
Work takes into account the time it takes to complete a task
c)
Power is force/area
d)
Work is force/area
41.
The more POWER you use to move an object, the more work you do. 
a)
True
b)
False
42.
The FARTHER you move an object, the more work you do.
a)
True
b)
False
43.

Jane carries a 5 kg box and Lorie carries a 10 kg box up a set of stairs, who did more work?

a)

Jane because his box was lighter.

b)

Lorie because her box weighed more.

c)

Can't tell.

44.

If you use 30 J of energy to move an object, you have done ____ J of work.

a)

3

b)

10

c)

30

d)

0

45.

How much power is generated by Ashley (50 kg) running up a 6 m flight of stairs in 5 seconds?

a)

60 W

b)

62 W

c)

600 W

d)

1500 W

46.

If you run up the stairs slower you will

a)

do more work.

b)

do less work.

c)

generate more power.

d)

generate less power.

47.

In which case is work being done?

a)

A

b)

B

c)

C

d)

D

48.

Joel and Jerry push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do on the car.

a)

Joel does 75% more work than Jerry.

b)

Joel does 50% more work than Jerry.

c)

Jerry does 50% more work than Joel.

d)

Joel does 25% more work than Jerry.

e)

Neither of them does any work.

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