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Energy & Simple Machines Review

Total questions: 43

Worksheet time: 28mins

Name
Class
Date
1.
What simple machine has a fulcrum and can be used to lift a weight?
a)
Pulley
b)
lever
c)
screw
d)
wedge
2.
What simple machine has a wheel with a groove on it that keeps a rope in place?
a)
pulley
b)
lever
lever
c)
screw
wedge
d)
wedge
screw
3.

Which simple machine can a heavy object be rolled or pushed up?

a)

wheel and axle

b)

inclined plane

c)

wedge

d)

screw

4.
What type of simple machine are these people using to move the wheel chair into the school bus?
a)
lever
b)
wedge
c)
inclined plane
d)
pulley
5.
What is the fixed point where a lever turns or pivots?
a)
load
b)
work
c)
fulcrum
d)
screw
6.

work is...

a)

energy from the sun

b)

boring

c)

a force applied to an object to move the object a distance

d)

something that pulls you toward the earth

7.
Which of these is not an example of an inclined plane?
a)
ladder
b)
stairs
c)
wall
d)
driveway
8.

Which of the following is NOT one of the things a machine can do?

a)

Changes the amount of force required.

b)

Changes the distance over which the force is exerted.

c)

Changes the direction of the force.

d)

Changes the amount of work done.

9.

How can simple machines make work easier?

a)

by decreasing the force needed to complete the task

b)

by increasing the friction between the machine and the object

c)

by adding more work on the object than originally applied

d)

by removing the force of gravity on the object

10.

Which simple machine would be the MOST efficient for lifting an object 30 meters off the ground?

a)

pulley

b)

screw

c)

wedge

d)

lever

11.

Which machine could be considered to be a type of inclined plane?

a)

wheel and axle

b)

lever

c)

screw

d)

pulley

12.

Workers push a heavy box up an inclined plane and onto a moving truck. Which best explains why these workers use an inclined plane?

a)

It makes their work easier because it requires less effort.

b)

It decreases the amount of work they have to do.

c)

It increases the amount of friction necessary to do the task.

d)

It makes the box weigh less.

13.

A house uses a roof to carry away large amounts of rain efficiently. A roof composed of 2 attached inclined planes would be considered which type of simple machine?

a)

wedge

b)

screw

c)

ramp

d)

lever

14.

Using the back of a hammer makes it much easier to remove a nail from a wooden board. What kind of simple machine would the hammer be classified as if you are using it for this purpose?

a)

Wedge

b)

Lever

c)

Pullye

d)

Inclined Plane

15.

What is the mechanical advantage of this pulley?

a)

.5

b)

1

c)

1.5

d)

2

16.
How much work is produced when 350 N is used to move a car 5 m (W=Fd)?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
17.

What is mechanical advantage?

a)

The advantage a machine has over a bicycle

b)

A measure of how much a simple machine reduces work

c)

A measure of when is the best time to use a simple machine

d)

the number of times a machine increases input force

18.
What does one newton exerted over a distance of one meter equal?
a)
One watt
b)
One hertz
c)
One volt 
d)
One joule 
19.
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 
20.
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 
21.
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 
22.
Which of these is a measure of force?
a)
100 newtons
b)
100 meters per second
c)
100 joules
d)
100 watts
23.
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
24.
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
25.
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
26.
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
27.

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

28.
In which of these cases is work being done? 
a)
A student sleeps
b)
A student pushes a locked door that does not move
c)
a student carries his chair into another room
d)
A student sits on the carpet
29.
True or false: when the distance an object moves is zero the work done on the object is also zero.  
a)
True
b)
False
30.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
31.

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

32.

what would 1m be an example of?

a)

work

b)

power

c)

time

d)

distance

33.

what would 14J be an example of?

a)

work

b)

distance

c)

time

d)

force

34.

What is an example of a force?

a)

Energy

b)

Power

c)

Pressure

d)

Weight

35.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
36.

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

37.

what would you solve for if given distance and force?

a)

work

b)

power

c)

time

d)

motion

38.

What would you solve for if given time and work?

a)

power

b)

force

c)

distance

d)

work

39.

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

a)

power

b)

time

c)

force

d)

motion

40.

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

41.

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

42.
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
43.
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

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