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7.1 Work & Power

Total questions: 21

Worksheet time: 18mins

Name
Class
Date
1.
True or false
You do work only when you exert a force on an object and move it
a)
true
b)
false
2.
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
3.
work is a measurement of how much force is applied over a certain
a)
distance
b)
velocity
c)
shape
d)
size
4.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
5.
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
6.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
7.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
8.

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

9.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
10.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
11.
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
12.
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
13.
True or false: when the distance an object moves is zero the work done on the object is also zero.  
a)
True
b)
False
14.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
15.

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

16.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

17.

what would 1m be an example of?

a)

work

b)

power

c)

time

d)

distance

18.

what would 14J be an example of?

a)

work

b)

distance

c)

time

d)

force

19.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
20.

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

21.

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

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