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WORK AND POWER PHYSICS GRADE 7

Total questions: 76

Worksheet time: 2hrs 57mins

Name
Class
Date
1.
Work divided by time equals...
a)
energy
b)
power
2.
The unit of work is the ...
a)
joule
b)
force
3.
The unit of power is the...
a)
work
b)
watt
4.
Force multiplied by distance equals...
a)
work
b)
power
5.
What does one newton exerted over a distance of one meter equal?
a)
One watt
b)
One hertz
c)
One volt 
d)
One joule 
6.
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 
7.
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 
8.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
9.
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
10.
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
11.
Which of the following would produce the most power?
a)
A mass of 10 kilograms lifted 10 meters in 10 seconds 
b)
A mass of 10 kilograms lifted 10 meters in 5 seconds
c)
A mass of 5 kilograms lifted 10 meters in 5 seconds
d)
A mass of 5 kilograms lifted 5 meters in 10 seconds
12.
What does one newton exerted over a distance of one meter equal?
a)
One watt
b)
One hertz
c)
One volt 
d)
One joule 
13.
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 
14.
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 
15.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
16.
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
17.
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
18.
Which of the following would produce the most power?
a)
A mass of 10 kilograms lifted 10 meters in 10 seconds 
b)
A mass of 10 kilograms lifted 10 meters in 5 seconds
c)
A mass of 5 kilograms lifted 10 meters in 5 seconds
d)
A mass of 5 kilograms lifted 5 meters in 10 seconds
19.
Work divided by time equals...
a)
energy
b)
power
20.
The unit of work is the ...
a)
joule
b)
force
21.
The unit of power is the...
a)
work
b)
watt
22.
Force multiplied by distance equals...
a)
work
b)
power
23.

What is needed to calculate work?

a)

force

b)

distance

c)

time

d)

mass

24.

What is an equivalent formula for force?

a)

F=d×tF=d\times t

b)

a=Fma=\frac{F}{m}

c)

F=WdF=\frac{W}{d}

d)

m=F×am=F\times a

25.

Work is measured in which units?

a)

Newtons

b)

Joules

c)

Watts

d)

Joule/sec

26.

Power is measured in which units?

a)

Newtons

b)

Joules

c)

Watts

d)

Joule/sec

27.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
28.

A strongman exerts 1500 N on the side of a building. After 2 minutes, the building doesn't move. How much work did he do?

a)

180,000 J

b)

0 J

c)

750 J

d)

1500 J

29.

You use 950 J of energy to push a sofa. If it took you 5 sec to move the sofa, what was your power?

a)

190 J

b)

4750 J

c)

4750 W

d)

190 W

30.

If 360 J of work is needed to move a crate a distance of 4 m, what is the weight of the crate?

a)

90 N

b)

720 N

c)

90 kg

d)

720 W

31.

A runner exerts 240,000 J when she runs for 10 min. What is the runner's power?

a)

400 W

b)

600 W

c)

400 J

d)

600 J

32.
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 
33.

A box is pushed across the floor a distance of 8 m with a force of 55 N in 7 s. What is the work done?

a)

440 J

b)

440 W

c)

62.9 J

d)

62.9 W

34.

The power rating of an electric lawnmower is 3000 W. If the lawnmower is used for 60 sec, how many joules of work can it do?

a)

270,000 W

b)

270,000 J

c)

180,000 J

d)

33.3 W

35.

A 400 N object is in a 32,000 N elevator that rises 30 m in 2 min. How much power is needed for the elevator's trip?

a)

8100 J

b)

972,000 J

c)

972,000 W

d)

8100 W

36.

A student who weighs 350 N climbs a flight of stairs 6 m high in 10 sec. How much power does the student need to do this?

a)

35.6 J

b)

35.6 W

c)

210 W

d)

583 J

37.
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
38.
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
39.
An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how much work was done?
a)
1,356,490 J
b)
1,356,480 J
c)
1,356,470 J
d)
1,356,460 J
40.
The formula for work is:
a)
d = r x t
b)
p = m x v
c)
f = m x a
d)
w = d x f
41.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
meter
42.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
43.
A 50N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
44.
 Work done = Force x _________
a)
distance
b)
acceleration
c)
velocity
d)
speed
45.

What is the unit for force?

a)

Kilogram (Kg)

b)

Newton (N)

c)

Joule (J)

d)

Watt (W)

46.
What is the unit for force?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
47.
____________ is work divided by time.
a)
Work
b)
Distance
c)
Power
d)
Force
48.

Newtons are the correct unit for which of the following?

a)

Force

b)

Work

c)

Power

d)

Acceleration

49.

How do we calculate work?

a)

W = F * d

b)

w = f / d

50.

Which is the correct unit for work?

a)

Joules

b)

Newton

c)

meter

d)

Watts

51.
The rate at which work is done.
a)
Joules
b)
Power
c)
Watts
d)
Newtons
52.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
53.

What is the correct unit for power?

a)

Watt

b)

Joules

c)

Newtons

d)

seconds

54.

It took 500 Newtons of force to push a car four meters. How much work was done?

a)

2000 J

b)

125 J

c)

0.008 J

d)

500 J

55.
1. A book weighing 1.0 newton is lifted 2 meters.  How much work was done?
a)
2 J
b)
0.5 J
56.
A force of 15 newtons is used to push a box along the floor a distance of 3 meters.  How much work was done?
a)
3 J
b)
45 J
57.
It took 500 newtons of force to push a car 4 meters.  How much work was done?
a)
2,000 J
b)
125 J
58.

What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?

a)

250 W

b)

0.004 W

c)

56,250 W

d)

25 W

59.

How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)

a)

70 W

b)

3.5 W

c)

7 W

d)

350 J

60.
A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?
a)
16.67 watts
b)
50 watts
61.
How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?
a)
70 watts
b)
1750 watts
62.
The SI Unit for Mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
63.
The SI Unit for Work
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
64.
The SI Unit for Force
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
65.
The SI Unit for Time
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
66.
The SI Unit for Power
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
67.
What is the formula for Work?
a)
E=mc2
b)
W= F x d
c)
P = W/T
68.
What is the formula for Power?
a)
E=mc2
b)
W= F x d
c)
P = W/T
69.
F=200 N
d=50 m
w=??
a)
4 J
b)
0.25 J
c)
250 J
d)
10,000 J
70.
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
71.
Find the distance an object traveled if a force of 350 N acted on it to produce 0 work?
a)
3 m
b)
2 m
c)
1 m
d)
0 m
72.
An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how much work was done?
a)
1,356,490 J
b)
1,356,480 J
c)
1,356,470 J
d)
1,356,460 J
73.
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
74.
W = 500 Joules 
t = 25 seconds
P = ???
a)
0.05 W
b)
20 W
c)
12500 W
d)
2000 W
75.
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
76.
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?
a)
360 W 
b)
60 W
c)
3600 W
d)
600 W

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