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Simple Machines and

Total questions: 135

Worksheet time: 31hrs 0mins

Name
Class
Date
1.

work can be thought of as

a)
energy from the sun
b)
a type of machine
c)

a force that moves an object a certain distance

d)
a force that pulls you toward the earh
2.
What type of simple machine is found on the cap of a pickle jar?
a)
lever
b)
inclined plane
c)
pulley
d)
screw
3.
A ramp.
a)
Lever
b)
Inclined Plane
c)
Wedge
d)
Screw
4.

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

5.

Simple machines can make work easier by reducing the effort force needed to move an object. However, there is a trade off for decreased effort. What is the trade off?

a)

you have to move a greater distance

b)

The distance moved is decreased.

c)

The amount of work is increased.

d)

The amount of work is decreased.

6.

A doorknob is an example of a _______.

a)

wheel and axle

b)

inclined plane

c)

pulley

d)

wedge

7.

An example of a lever is a ________.

a)

car wheels

b)

drill

c)

staircase

d)

hammer

8.

The fixed point around which a lever rotates is know as the

a)

wheel.

b)

fulcrum.

c)

input force.

d)

output force.

9.

A simple machine that splits an object apart is a _______.

a)

inclined plane

b)

fulcrum

c)

wedge

d)

lever

10.

What is the formula needed to solve for work?

a)

w = f/d

b)

w = f*d

c)

w = f+d

11.

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

12.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
13.
To increase the mechanical advantage of a lever
a)
make sure the fulcrum is in the middle of the lever
b)

move the fulcrum closer to the resistance

c)
move the fulcrum closer to the effort
d)
use a bigger fulcrum
14.

What does the term Mechanical Advantage mean?

a)

What the machine can accomplish

b)

how much better the machine can work

c)

how much stronger a machine makes you

d)

how much friction a machine overcomes

15.

Why would you ever want a machine with a mechanical advantage less than 1?

a)

makes you stronger

b)

makes you faster

c)

makes you more efficient

d)

you wouldn't- It makes you weaker

16.

Why is it easier to use a hamer to pound in a nail?

a)

the hammer makes you faster- more energy

b)

the hammer makes you stronger

c)

the hammer has a high MA

d)

so you don't hurt your hand

17.

how much force is needed to move a 50 Newton block 5 meters. You are using a lever that you have to move 10 meters?

a)

10 N

b)

100 N

c)

25 N

d)

0.5 N

18.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
19.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
20.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
21.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
22.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
23.
What is a simple machine?
a)

A device that helps makes work easier

b)

A device that gives you more work out

24.

In a wheel and axle, the wheel travels a longer ________ but takes ____ force

a)

Force, work

b)

Distance, more

c)

Energy, less

d)

Distance, less

25.
What type of simple machine is found on the cap of a pickle jar?
a)
lever
b)
inclined plane
c)
pulley
d)
screw
26.
A ramp.
a)
Lever
b)
Inclined Plane
c)
Wedge
d)
Screw
27.

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

28.

Simple machines can make work easier by reducing the effort force needed to move an object. However, there is a trade off for decreased effort. What is the trade off?

a)

you have to move a greater distance

b)

The distance moved is decreased.

c)

The amount of work is increased.

d)

The amount of work is decreased.

29.

A doorknob is an example of a _______.

a)

wheel and axle

b)

inclined plane

c)

pulley

d)

wedge

30.

An example of a lever is a ________.

a)

car wheels

b)

drill

c)

staircase

d)

hammer

31.

The fixed point around which a lever rotates is know as the

a)

wheel.

b)

fulcrum.

c)

input force.

d)

output force.

32.

A simple machine that splits an object apart is a _______.

a)

inclined plane

b)

fulcrum

c)

wedge

d)

lever

33.

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

34.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
35.
To increase the mechanical advantage of a lever
a)
make sure the fulcrum is in the middle of the lever
b)

move the fulcrum closer to the resistance

c)
move the fulcrum closer to the effort
d)
use a bigger fulcrum
36.

What does the term Mechanical Advantage mean?

a)

What the machine can accomplish

b)

how much better the machine can work

c)

how much stronger a machine makes you

d)

how much friction a machine overcomes

37.

Why would you ever want a machine with a mechanical advantage less than 1?

a)

makes you stronger

b)

makes you faster

c)

makes you more efficient

d)

you wouldn't- It makes you weaker

38.

Why is it easier to use a hamer to pound in a nail?

a)

the hammer makes you faster- more energy

b)

the hammer makes you stronger

c)

the hammer has a high MA

d)

so you don't hurt your hand

39.

how much force is needed to move a 50 Newton block 5 meters. You are using a lever that you have to move 10 meters?

a)

10 N

b)

100 N

c)

25 N

d)

0.5 N

40.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
41.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
42.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
43.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
44.
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
It is not a lever
45.
What is a simple machine?
a)

A device that helps makes work easier

b)

A device that gives you more work out

46.

In a wheel and axle, the wheel travels a longer ________ but takes ____ force

a)

Force, work

b)

Distance, more

c)

Energy, less

d)

Distance, less

47.
What is resistance (output) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
48.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
49.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
50.
How does a single fixed puled, like the one seen here, help you do work?
a)
changes the direction of the force
b)
increases the amount of applied force
c)
decreases the amount of applied force
d)
allows you to pull the rope a shorter distance
51.
A machine is a device that____________.
a)
changes either the magnitude or direction of force
b)
always makes lifting objects require more effort
c)
changes only magnitude of the force
d)
Changes only direction of the force
52.
What is the primary mechanical advantage of using the simple machine seen in the image?
a)
You can apply a large force and have it penetrate over a very long distance.
b)
You can apply a long distance and have it convert into a very short distance.
c)
You can apply a short distance and have it multiplied to penetrate a large distance.
d)
You can apply a small force to penetrate something that normally requires a large force.
53.
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
a)
0
b)
2
c)
4
d)
8
54.
A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?
a)
5.5 N
b)
40.7 N
c)
87.3 N
d)
2640 N
55.
An axle is 4 meters and the wheel is 8 meters.  What is the mechanical advantage?
a)
2
b)
32
c)
.5
56.
Name the class of lever.
a)
Class 1
b)
Class 2
c)
Class 3
d)
Class president
57.
What is the mechanical advantage for this lever?
a)
1
b)
2
c)
1/2
d)
8
58.
What is the mechanical advantage for this lever?
a)
1
b)
2
c)
1/2
d)
8
59.
What is the mechanical advantage for the inclined plane?
a)
5
b)
1/5
c)
45
d)
17
60.
What is the input force?
a)
50 N
b)
4 m
c)
12 m
d)
150 N
61.
What is the output force?
a)
12 m
b)
50 N
c)
150 N
d)
4 m
62.
Input force is the same as 
a)
output
b)
resistance 
c)
effort
63.
How do you calculate the MA of an inclined plane?
a)
height / length
b)
input X  height
c)
length / height
d)
output X length
64.
The units for MA are called
a)
Joules
b)
Watts
c)
newtons
d)
MA is a ratio so it does not have units
65.
How do you calculate the MA of a lever?
a)
Effort arm length X Resistance arm Length
b)
Resistance arm / effort arm
c)
output X input
d)
Effort arm length / Resistance arm Length
66.

What YOU do is called the

a)

load

b)

resistance

c)

effort

67.

Idenfity the effort distance.

a)

4 ft

b)

12 ft

68.

What is the purpose of using an inclined plane?

a)

To put in LESS work.

b)

To use LESS effort force.

c)

To travel a SHORTER distance.

d)

There is no purpose.

69.

If you use LESS effort force, what is the tradeoff?

a)

There is no tradeoff.

b)

You have to do the work FASTER.

c)

You must do LESS work.

d)

You have to travel a GREATER distance.

70.

The number that represents how much EASIER it is do the do the work is called

a)

Mechanical Advantage

b)

Work In

c)

Effort Distance

d)

Efficiency

71.

Which ramp would require LESS effort force to go up?

a)

A (longer)

b)

B (shorter)

72.

Which ramp has the GREATEST mechanical advantage?

a)

A (longer)

b)

B (shorter)

73.

If the ramp has a mechanical advantage of 2, how much effort force will it take to move a load that is 200 N?

a)

50 N

b)

100 N

c)

200 N

d)

400 N

e)

Impossible.

74.

Which lever has the GREATEST effort distance?

a)

A

b)

B

c)

C

d)

D

75.

Which lever will require the LEAST amount of effort force?

a)

A

b)

B

c)

C

d)

D

76.

Which lever has the GREATEST mechanical advantage?

a)

A

b)

B

c)

C

d)

D

77.

What is the mechanical advantage of this pulley?

a)

.5

b)

1

c)

1.5

d)

2

78.

A load of 650 newtons is lifted with this pulley. What is the effort required to do this work?

a)

300

b)

325

c)

600

d)

650

79.

An effort of 450 newtons is applied to this pulley. What is the force of the load that will be lifted?

a)

450

b)

600

c)

750

d)

900

80.

What is the mechanical advantage of this pulley system?

a)

4

b)

6

c)

8

d)

10

81.

How much effort is required to lift the 300 newton load?

a)

50

b)

60

c)

75

d)

90

82.
1. A _________is a simple machine with a fulcrum and a rigid bar.
a)
Pivot
b)
Lever
c)
Wedge
83.
3. Which type of lever is this?
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
84.
When speed increases, what happens to the value of torque?
a)
increases
b)
decreases
c)
stays constant
85.
When speed decreases, what happens to the value of torque?
a)
increases
b)
decreases
c)
stays constant
86.
When speed is constant, what happens to the value of torque?
a)
increases
b)
decreases
c)
stays constant
87.
A gear ratio is defined as which of the following?
a)
Teeth of gear : teeth of gear
b)
gear shape : gear shape
c)
Speed : torque
88.
A gear ratio is defined as which of the following?
a)
Teeth of gear : teeth of gear
b)
gear shape : gear shape
c)
Speed : torque
89.
What is the function of the smaller gear?
a)
Makes the output gear turn slower
b)
Makes the output gear turn faster
c)
Makes the larger gears turn in opposite directions.
d)
Makes the larger gears turn in the same direction.
90.
What is a Ratio?
a)
It's a comparison of two things
b)
Multiplying two fractions 
c)
A number over another number
d)
Two decimals that can be multiplied
91.

# of teeth input gear = 8

# of teeth output gear = 40

What is the gear ratio (in lowest terms)?

a)

5:1

b)

40:8

c)

1:5

d)

8:40

92.

What's the ratio?

a)

1:1

b)

84 : 60

c)

60 : 84

93.

What's the ratio?

a)

1:1

b)

84 : 60

c)

60 : 36

94.

What's the ratio?

a)

1:1

b)

60 : 36

c)

36 : 60

95.

What's the ratio?

a)

1:1

b)

12 : 84

c)

84 : 12

96.

If the small gear is input gear, what is happening to the torque?

a)

Increase

b)

Decrease

c)

Remains constant

d)

Not enough information

97.

# of teeth input gear = 60

# of teeth output gear = 36

What is the gear ratio (in lowest terms)?

a)

36:60

b)

60:36

c)

3:5

d)

5:3

98.

The input gear in the image is the larger gear. Calculate the gear ratio (in lowest terms)

a)

4:6

b)

6:4

c)

2:3

d)

3:2

99.

# of teeth input gear = 24

# of teeth output gear = 4

What is the gear ratio (in lowest terms)?

a)

4:24

b)

1:6

c)

2:12

d)

1:9

100.

# of teeth input gear = 10

# of teeth output gear = 6

What is the gear ratio (in lowest terms)?

a)

6:10

b)

3:10

c)

10:6

d)

3:5

101.

A simple gear train is composed of three gears. Gear A is the driver and has 84 teeth, bear B has 60 teeth, and gear c has 20 teeth. If the output is gear C, what is the gear ratio?

a)

57\frac{5}{7}

b)

31\frac{3}{1}

c)

521\frac{5}{21}

102.

A simple gear train is composed of three gears. Gear A is the driver and has 84 teeth, bear B has 60 teeth, and gear c has 42 teeth. If gear C rotates at 60 rpm, how fast is gear a rotating?

a)

120 rpm

b)

30 rpm

c)

60 rpm

d)

90 rpm

103.

which is the driven or follower gear?

a)

A

b)

B

104.

Which direction will the follower in a meshed gear train turn if the driver is turning to the right

a)

to the left

b)

To the right

c)

they won't turn

d)

They need a chain

105.

What is the formula for gear ratio

a)

drive over driven

b)

driven over drive

c)

follower over driven

d)

output over follower

106.

which is the driven or follower gear?

a)

A

b)

B

107.

Which direction will the follower in a meshed gear train turn if the driver is turning to the right

a)

to the left

b)

To the right

c)

they won't turn

d)

They need a chain

108.

What is the formula for gear ratio

a)

drive over driven

b)

driven over drive

c)

follower over driven

d)

output over follower

109.

which is the driven or follower gear?

a)

A

b)

B

110.

Which direction will the follower in a meshed gear train turn if the driver is turning to the right

a)

to the left

b)

To the right

c)

they won't turn

d)

They need a chain

111.

What is the formula for gear ratio

a)

drive over driven

b)

driven over drive

c)

follower over driven

d)

output over follower

112.

If the drive gear is smaller, your robot will be

a)

faster

b)

no change

c)

slower

113.

Another word for torque is

a)

shaft

b)

zombie

c)

speed

d)

power

114.

Which direction will the follower in a chain and sprocket turn if the driver is turning to the right

a)

to the right

b)

to the left

c)

they won't turn

d)

turn opposite direction

115.

If your drive gear is 36 and your driven gear is 60, what is the gear ratio?

a)

5/3

b)

3/5

c)

60/1

d)

36/1

116.

Making a _________________change is one of the easiest ways to change mechanical advantage in a mechanism or system to achieve the desired speed and/or torque.

a)

gear teeth

b)

Gear Ratio

c)

drastic

d)

position

117.

What do we call the gear connected to the input power source, such as a motor?

a)

Driven Gear

b)

Bigger Gear

c)

Smaller Gear

d)

Driving Gear

118.

What do we call the gear connected to the output, such as a wheel or mechanism in a system?

a)

Driving Gear

b)

Driven Gear

c)

Bigger Gear

d)

Smaller Gear

119.

When you have a system with a driving gear that is _______ than the driven gear you will increase torque and decrease speed.

a)

smaller

b)

bigger

c)

same size

d)

thicker

120.

When you have a system with a driving gear that is LARGER than the driven gear you will ___________________

a)

decrease Speed and decrease Torque

b)

increase Speed and increase Torque

c)

increase Speed and decrease Torque

d)

decrease Speed and increase Torque

121.

Gear reduction is seen as a fraction that is often reduced to simplify the expression. Gear reduction: 40 / 12 gets reduced to

a)

20/6

b)

80/24

c)

10 / 3

d)

30/9

122.

_________have NO EFFECT on Gear Ratio or Gear Reduction, regardless of the number of teeth they have.

a)

Idling Gears

b)

Idler Gears

c)

Driven Gears

d)

Driving Gears

123.

All gears in between the driving gear and the driven gear that only transmit power are known as ______

a)

Idler Gears

b)

Trained Gears

c)

Driven Gears

d)

Driving Gears

124.

Compound Gear Reduction and is calculated by _________the gear reductions of each of the individual gear pairs.

a)

multiplying

b)

dividing

c)

adding

d)

subtracting

125.

In a bicycle the biggest gear is the

a)

Driven gear

b)

Driving gear

c)

Where the pedal is

d)

Where the driven wheel is

126.

To optimize the performance of our kinetic cars the driven wheels should be connected with the _________ gears

a)

thickest

b)

thinnest

c)

biggest

d)

smallest

127.

To optimize the performance of our kinetic cars the driving gear is where the elastic band gets wound up and it needs to be _____________ than the driven gear.

a)

smaller

b)

bigger

c)

thinner

d)

thicker

128.

True or False:

A gear ratio is the ratio of the number of rotations of a driver gear to the number of rotations of a driven gear.

a)

True

b)

False

129.

The __________ Gear causes motion

a)

Driven

b)

Driving

c)

Smallest

d)

Biggest

130.

The idler gear allows the driven and driving gears to rotate in the same _______

a)

speed

b)

way

c)

direction

d)

momentum

131.

The rpm of the bigger gear is always ______ than the rpm of the smaller gear.

a)

slower

b)

faster

c)

more

d)

less

132.

Gears locked together on the same shaft will always turn in the same _______ and at the same rpm.

a)

speed

b)

torque

c)

direction

d)

momentum

133.

What is the gear ratio with a driving gear with 40 teeth and a driven gear with 8 teeth?

a)

5

b)

1/5

c)

5/8

d)

8/5

134.

What is the Gear Ratio of a driven gear with 8 teeth and a driving gear with 32 teeth?

a)

4

b)

1/4

c)

0.4

d)

0.25

135.

When you have a system with a driving gear that is LARGER than the driven gear you will increase Speed and decrease _____

a)

speed

b)

ratio

c)

Momentum

d)

Torque

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