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Physical Science Chapter 14 Review

Total questions: 74

Worksheet time: 1hrs 14mins

Name
Class
Date
1.
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
2.

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

3.
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
4.

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

5.

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

6.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
7.

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

a)

2.4

b)

3.4

c)

4.4

8.
The amount by which a machine multiplies input force is known as the 
a)
work.
b)
power.
c)
output force.
d)
mechanical advantage.
9.
Mechanical advantage is a measure of how much a machine multiplies the input
a)
efficiency.
b)
force.
c)
power.
d)
work.
10.
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
11.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m 
c)
80 m 
d)
1536 m 
12.

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

a)

Lever A

b)

Lever B

13.

How much effort would it take to lift Lever A?

a)

60 N

b)

50N

c)

40 N

d)

30 N

14.

How much effort would it take to lift Lever B?

a)

60 N

b)

50 N

c)

40 N

d)

30 N

15.
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
16.
What is the equation for force?
a)
F= mass × acceleration
b)
F = mass × distance
c)
F= distance/time
d)
F = mass/time 
17.
What is the unit of measurement for work?
a)
Newtons
b)
Joules 
c)
Watts
d)
Meters
18.
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
19.
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
20.
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
21.
Is this an example of work?
A teacher applies a force to a wall and becomes exhausted.
a)
True
b)
False
22.
Is this an example of work? 
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. 
a)
True
b)
False
23.
Is this an example of work? 
A rocket accelerates through space.
a)
True
b)
False
24.

What is a machine?

a)

an object that has AI

b)

an object that is designed to take over the earth in 2020

c)

a device that changes force

d)

a mechanism that is used to decrease the amount of work done

25.

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

26.

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

27.

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

28.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
29.
The work of pulling the box will be _________ if the man uses the ramp.
a)
complete
b)
more difficult
c)
easier
d)
painful
30.
The ramp helps the man do work by reducing the input ____________.
a)
distance
b)
force
c)
time
d)
power
31.
A machine's __________________ is the number of times the machine multiplies the input force.
a)
power
b)
force
c)
mechanical advantage
d)
efficiency
32.
An ideal machine has no ___________.
a)
moving parts
b)
power requirements 
c)
friction
d)
work required
33.

A wheelbarrow is a good example of what class of lever?

a)

first class

b)

second class

c)

third class

34.

A human arm is a good example of what class of lever?

a)

first class

b)

second class

c)

third class

35.

Which of these items is a first class lever?

a)

scissors

b)

fishing rod

c)

tweezers

d)

none of these

36.

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

37.

A simple machine has an input force of 12 N and an output force of 4 N. What is its mechanical advantage?

a)

.33

b)

3

c)

8

d)

16

38.

The amount that input is magnified by a simple machine is known as the :

a)

mechanical advantage

b)

output force

c)

resistance

d)

none of these

39.

The 3 parts of a lever are:

a)

fulcrum, effort, and load

b)

load, output, and input

c)

input, effort, and fulcrum

d)

pivot, output, and fulcrum

40.

For a lever, AMA is calculated using measurements of the:

a)

forces

b)

distances

c)

the lengths of the effort and resistance arms

d)

the input and the output

41.

The IMA (ideal mechanical advantage) formula of a lever is:

a)

output/input

b)

input/output

c)

distance of effort/ distance of resistance

d)

resistance arm length/effort arm length

42.

A lever has an effort (input) arm length of 75 ft and an output (resistance) arm length of 25 ft. The actual mechanical advantage of this lever is:

a)

3

b)

.33

c)

1875

d)

not enough information to solve this

43.

A device that helps us do work andand that has only one input is known as a:

a)

simple machine

b)

wheel and axle

c)

mechanical advantage

d)

really?

44.

If we get a positive mechanical advantage from using a simple machine, we will have to "pay for it" with the cost of more _____________ .

a)

force

b)

distance

c)

mechanical advantage

d)

effort

45.
What is the ideal mechanical advantage of an inclined plane which has 4 cm height and 16 cm slope?
a)
1/4
b)
1
c)
16
d)
4
46.
What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the 1machine?
a)
0.25 J
b)
26%
c)
386%
d)
3.86 J
47.
What is the efficiency of the machine if the input is 263 J and the output is 142 J? 
a)
6.26%
b)
54%
c)
100%
d)
260%
48.
A machine has a work output of 8 joules and requires 10 joules of work input to operate. What is the machine's efficiency?
a)
8 J
b)
10 J
c)
80%
d)
800%
49.
What is the mechanical efficiency of a machine whose work input is 250 J and work output is 30 Joules??
a)
12 % ME
b)
83 % ME 
c)
.12 % ME 
d)
.83% ME 
50.
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
51.

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

52.

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

53.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
54.
Mechanical advantage is a measure of how much a machine multiplies the input
a)
efficiency.
b)
force.
c)
power.
d)
work.
55.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m 
c)
80 m 
d)
1536 m 
56.

A pulley has a mechanical advantage equal to 1 because.....

a)

The output force is larger than the input force.

b)

The output force is smaller than the input force.

c)

The output and input force are equal, but the direction of the force changes.

d)

None of the above.

57.

A machine's _______________ is determined by comparing the input and output forces.

a)

efficiency

b)

mechanical advantage

c)

work

d)

friction

58.

The _________ of a machine is always less than 100%.

a)

mechanical advantage

b)

friction

c)

force

d)

efficiency

59.

How does using a jack to lift a car make work easier?

a)

it changes the size of the foce

b)

it changes the distance the force acts

c)

it changes the direction a force acts

d)

none of the above

60.

Why can mechanical efficiency never be 100%?

a)

No machine is strong enough.

b)

Machines are too big to allow for 100% efficiency.

c)

It can be 100%.

d)

Some energy is lost in the form of heat/sound due to friction.

61.

What happens to the overall efficiency of a machine as I add more machines?

a)

For each simple machine you add, the overall efficiency increases because it gets faster.

b)

For each simple machine you add, the overall efficiency decreases.

c)

The overall efficiency is divided in half for every simple machine you add.

d)

There is no connection.

62.

the amount of work you do when you exert one Newton of force to move the object one meter

a)

joule

b)

newton

c)

meter

d)

output force

63.

the rate at which work is done

a)

power

b)

work

c)

machine

d)

efficiency

64.

a machine that utilizes two or more simple machines

a)

compound machine

b)

machine

c)

wedge

d)

screw

65.

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

66.

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

67.
What is the equation for mechanical advantage?
a)
MA=input force*output force
b)
MA=output force/input force
c)
MA=input force/output force
d)
MA= output force - input force
68.

A machine with a ratio less than 1:

a)

multiplies the input force so the machine would be good to help move heavy objects.

b)

does not multiply the force, but increases distance and speed.

c)

is good for lifting and moving objects quicker.

d)

Is not good for lifting or moving objects quicker.

69.

Real machines:

a)

actually exist

b)

have an efficiency less than 100%

c)

lose energy due to friction

d)

all are correct

70.

which lever type is a wheel barrow?

a)

type 1

b)

type 2

c)

type 3

d)

none of them

71.

the mechanical advantage of a wheel and axle is...

a)

wheel diameter / force

b)

wheel diameter / axle diameter

c)

axle diameter / wheel diameter

72.

What is the mechanical advantage of a pulley system that looks like this?

a)

5

b)

8

c)

1

d)

2

73.

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

74.

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

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