WorksheetsWork and Power
Total questions: 40
Worksheet time: 1hrs 20mins
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.
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
4.
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
5.
Simple machines make work easier by increasing what?
a)
The distance over which work is done
b)
The force needed to do work
c)
The time required to do work
d)
The acceleration of a massive object
6.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
7.
You move a 12-newton box up a 6-meter ramp. In order to find out how much power you created, what would you need to know?
a)
The mass of the box
b)
The slope of the ramp
c)
The direction the box moved
d)
How long the task took
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.
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
11.
Work divided by time equals...
a)
energy
b)
power
12.
The unit of work is the ...
a)
joule
b)
force
13.
The unit of power is the...
a)
work
b)
watt
14.
Force multiplied by distance equals...
a)
work
b)
power
15.
Work is done on an object when the object moves in the SAME direction in which the force is applied.
a)
True
b)
False
16.
If you pull at an angle instead of in the direction in which the object moves, MORE of your force does work.
a)
True
b)
False
17.
The FARTHER you move an object, the more work you do.
a)
True
b)
False
18.
The more POWER you use to move an object, the more work you do.
a)
True
b)
False
19.
If you lift a box from the floor to a height of 1m and then carry the for for 10m, you do work only when you CARRY the box.
a)
True
b)
False
20.
Power is the RATE at which work is done.
a)
True
b)
False
21.
The SI Unit for Mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
22.
The SI Unit for Work
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
23.
The SI Unit for Force
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
24.
The SI Unit for Time
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
25.
The SI Unit for Power
a)
Newton (N)
b)
Joule (J)
c)
Second (s)
d)
Watt (W)
26.
What is the formula for Work?
a)
E=mc2
b)
W= F x d
c)
P = W/T
27.
What is the formula for Power?
a)
E=mc2
b)
W= F x d
c)
P = W/T
28.
F=200 N
d=50 m
w=??
d=50 m
w=??
a)
4 J
b)
0.25 J
c)
250 J
d)
10,000 J
29.
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
30.
When a pendulum swings, at which point is potential energy at its greatest
a)
1
b)
2
c)
3
d)
4
31.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
32.
What kind of energy is in a battery?
a)
Potential
b)
Kinetic
33.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases
c)
The kinetic energy decreases while the potential energy increases
d)
Bothe the potential energy and kinetic energy increase
34.
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
35.
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
36.
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
37.
W = 500 Joules
t = 25 seconds
P = ???
t = 25 seconds
P = ???
a)
0.05 W
b)
20 W
c)
12500 W
d)
2000 W
38.
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
39.
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
40.
Would it be easier to move a box of the same mass up a ramp that was long and gradual or short and steep?
a)
long and gradual
b)
short and steep
100 %
