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Work and Power

Total questions: 32

Worksheet time: 28mins

Name
Class
Date
1.
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
2.
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
3.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
4.

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

a)

Yes, work was done

b)

No, work wasn't done

5.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
6.

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

7.

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

8.

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

9.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
10.
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
11.
The more POWER you use to move an object, the more work you do. 
a)
True
b)
False
12.
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
13.
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
14.
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 
15.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
16.

What would you solve for if you were given work and distance

a)

power

b)

time

c)

force

d)

motion

17.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

18.

what would 1m be an example of?

a)

work

b)

power

c)

time

d)

distance

19.

what would 14J be an example of?

a)

work

b)

distance

c)

time

d)

force

20.

What is an example of a force?

a)

Energy

b)

Power

c)

Pressure

d)

Weight

21.
True or false
You do work only when you exert a force on an object and move it
a)
true
b)
false
22.
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
23.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
24.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
25.

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

26.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
27.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
28.
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
29.
P=25 watts 
W=5000 Joules 
t=???
a)
200 sec
b)
0.0005 s
c)
125000 s
d)
125 s
30.

What is the relationship between Power and Work?

a)

Power is the rate which Work is done

b)

Work is not related to Power

c)

Power is the result of work times the time it takes to complete it

31.

Brutus is a weightlifter. He completes a lift in 3.5 s, what is the power of Brutus, if he performed 660.0J of work?

a)

2310 J

b)

He performs no work

c)

189 J

32.

The equation for POWER is

a)

power = mass x time

b)

power = work / time

c)

power = time / work

d)

power = work x time

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