WorksheetsWork and power
Total questions: 20
Worksheet time: 53mins
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.
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
3.
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
4.
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
5.
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
6.
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
7.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
8.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
9.
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
10.
Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
11.
Power is defined as the quantity that measures the rate at which _____ is done or energy is transformed.
a)
energy
b)
time
c)
work
d)
elasticity
12.
The unit used to measure power is the
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
13.
Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.
a)
Person A
b)
Person B
14.
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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
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
100 %
