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Work & Mechanical Advantage

Total questions: 50

Worksheet time: 2hrs 59mins

Name
Class
Date
1.
How is work defined?
a)
the amount of energy 
b)
the transfer of force over a distance
c)
rate of work in a given time
d)
the change in distance in a given time
2.
What is the equation for force?
a)
F= mass × acceleration
b)
F = mass × distance
c)
F= distance/time
d)
F = mass/time 
3.
What is the unit of measurement for work?
a)
Newtons
b)
Joules 
c)
Watts
d)
Meters
4.
Which of the following is an example of work being done?
a)
Teacher sitting in a chair
b)
Book resting on desk
c)
Keys hanging from a key chain
d)
A ball being rolled on the floor
5.
If a student uses 10 Newtons of Force to push a chair 5 meters, how much is work is being done?
a)
2 Joules
b)
.5 Joules
c)
50 Joules
d)
20 Newtons
6.
If a lion drags his prey 10 meters to his den doing 500 joules of work, how much force did he use?
a)
50 Newtons
b)
500 Joules
c)
50,000 Newtons
d)
10 Newtons
7.
A machine's __________________ is the number of times the machine multiplies the input force.
a)
power
b)
force
c)
mechanical advantage
d)
efficiency
8.
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
9.

What is effort (input) force?

a)

the force one exerts on a 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

10.

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 that is exerted by a machine

c)

the force the machine exerts on a object

d)

the output work times the input distance

11.

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

a)

2.4

b)

3.4

c)

4.4

12.
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
13.
What is the mechanical advantage if you lift a load of 300 newtons and you only push down with 50 newtons?
a)
250
b)
50
c)
60
d)
6
14.

A wedge has an output force of 25 N when given an input force of 5 N. What's the wedge's mechanical advantage?

a)

0.2

b)

5

c)

20

d)

30

15.

a rigid bar that is free to pivot, or rotate, on a fixed point

a)

wedge

b)

inclined plane

c)

lever

d)

fulcrum

16.

a device that is thick at one end and tapers to a thin edge at the other end

a)

wedge

b)

inclined plane

c)

lever

d)

fulcrum

17.

a simple machine that is a flat, sloped surface

a)

inclined plane

b)

wedge

c)

lever

d)

fulcrum

18.

the fixed point that a lever pivots around

a)

wedge

b)

inclined plane

c)

lever

d)

fulcrum

19.

a simple machine that acts like an inclined plane wrapped around a cylinder

a)

screw

b)

pulley

c)

fulcrum

d)

compound machine

20.

a simple machine made of two circular or cylindrical objects fastened together that rotate about a common axis

a)

wheel and axle

b)

pulley

c)

screw

d)

compound machine

21.

a simple machine made of a grooved wheel with a rope or cable wrapped around it

a)

pulley

b)

wheel and axle

c)

screw

d)

lever

22.

a machine that utilizes two or more simple machines

a)

compound machine

b)

machine

c)

wedge

d)

screw

23.

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

24.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
25.

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

26.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
27.

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 (MA=Output Force/Input Force)?

a)

1

b)

10

c)

100

d)

1000

28.

What is the efficiency of the pulley with no oil?

a)

82.5%

b)

85.8%

c)

88.3%

d)

91.7%

29.

What is the efficiency of the pulley after being lubricated with oil brand 1?

a)

82.6%

b)

84.0%

c)

86.2%

d)

94.2%

30.

What is the efficiency of the pulley after being lubricated with oil brand 2?

a)

83.2%

b)

85.4%

c)

86.8%

d)

87.5%

31.

What is the mechanical advantage of the hammer in this image?

a)

3

b)

35

c)

70

d)

105

32.

What is the mechanical advantage of can opener type 1?

a)

8

b)

12

c)

16

d)

24

33.

What is the mechanical advantage of can opener type 2?

a)

9

b)

10

c)

12

d)

14

34.

What is the mechanical advantage of can opener type 3?

a)

9

b)

11

c)

13

d)

15

35.

To open a soda can, you apply 3 N of force to its tab. The tab applies 6 N of force to the lid. What is the mechanical advantage of the tab?

a)

2

b)

3

c)

6

d)

18

36.

To lift a refrigerator, you apply 80 N of force to a wedge. The wedge applies 1,280 N of force to the refrigerator. What is the mechanical advantage of the wedge?

a)

12

b)

14

c)

16

d)

18

37.

To unscrew a screw, you use 20 N of force to twist a screwdriver. The screwdriver applies 100 N of force to the screw. What is the mechanical advantage of the screwdriver?

a)

2

b)

4

c)

5

d)

10

38.

To open a chest, you apply 50 N of force to a crowbar. The crowbar applies 450 N of force to the lid of the chest. What is the mechanical advantage of the crowbar?

a)

4

b)

5

c)

7

d)

9

39.
How can you decrease the effort force needed to push a weight to the top of the ramp? 
a)
cover the surface with carpet
b)
increase the length of the ramp
c)
increase the height of the ramp
d)
decrease the length of the ramp
40.

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?
a)
500 N
b)
1000 N
c)
2000 N
d)
8000 N
41.

What is the formula for mechanical advantage?

a)

MA=force x distance

b)

MA = distance ÷\div  time

c)

MA = time ÷\div  distance

d)

MA = output force ÷\div  input force

42.

What is the formula for work?

a)

work=force x distance

b)

work = distance ÷\div  time

c)

work = time ÷\div  distance

d)

work = output force ÷\div  input force

43.

Mona has locked herself out of her house. She

wants to use a crow bar to open the door. The

effort length of the crowbar is 48 cm and

mechanical advantage of the crowbar is 6. What

is the resistance length of the crowbar?

a)

6 cm

b)

8 cm

c)

10 cm

d)

12 cm

44.

The inclined plane shown below is being used to lift a box 6.0 feet.The inclined plane has a mechanical advantage of 1.5. What is the length, x, of the inclined plane?

a)

.25ft

b)

6ft

c)

7.5ft

d)

9ft

45.

Andrea is building a birdhouse. She hammers a nail in the wrong place and needs to remove it. She uses the back of her claw hammer to hold the nail and pushes the handle to remove the nail, as shown in the diagram. Andrea is using the hammer as a simple machine to pry the nail out. What is the mechanical advantage of the hammer?

a)

0.2

b)

0.4

c)

2.5

d)

5.4

46.

Which of the lever would it take less force to lift?

a)

Lever A

b)

Lever B

47.

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

48.
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
49.
What is the mechanical advantage of the block and tackle used to lift the bale of cotton?
a)
1
b)
2
c)
3
d)
4
50.
Which of the following is true for the picture?
a)
elephant is the fulcrum, mouse is the effort, triangle is the load
b)
mouse is the fulcrum, triangle is the effort, elephant is the load
c)
triangle is the fulcrum, mouse is the effort, elephant is the load

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