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Unit 4 Review: Newton's Laws, Simple Machines, & Forces

Total questions: 161

Worksheet time: 2hrs 16mins

Name
Class
Date
1.

___________ is when surfaces rub against each other.

a)

Static

b)

Friction

c)

Gravity

d)

Force

2.

For every action, there is equal and opposite __________?

a)

force

b)

reaction

c)

hot dog

d)

mass

3.

The mass of a rock is more or less than the mass of a feather?

a)

More

b)

Less

4.

If something has a lot of mass, you will need to use a lot of __________ to move it.

a)

friction

b)

gravity

c)

motion

d)

force

5.
A wheelbarrow is an example of
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
d)
Fourth Class Lever
6.
In a first class lever, the _____ is in the middle.
a)
Effort
b)
Fulcrum
c)
Load
d)
Machine
7.
In a second class lever, the ______ is in the middle.
a)
Effort
b)
Fulcrum
c)
Load
d)
Machine
8.
In third class levers, the ______ is in the middle. 
a)
Effort
b)
Fulcrum
c)
Load
9.
The flag pole mechanism is an example of which simple machine? 
a)
Inclined Plane
b)
Lever
c)
Wedge
d)
Pulley
10.
Which of the following does a simple machine NOT do?
a)
Increase the force applied
b)
Increase the distance the force is applied over
c)
Change the direction the force is applied
d)
Change the amount of work that needs to be done
11.
Which of these is not part of the lever?
a)
Object
b)
Fulcrum
c)
Load
d)
Lever
12.
The force placed on the simple machine to move the load is called the ____.
a)
Effort
b)
Fulcrum
c)
Load
d)
Lever
13.
Simple machines allow us to do less work.
a)
TRUE
b)
FALSE
14.
The two forces applied on a pulley are
a)
Effort Force and Resistance Force
b)
Effort and Load
15.

Which law states that the acceleration of an object depends on the force exerted on it and its mass?

a)

1st Law

b)

2nd Law

c)

3rd Law

16.

Which law states that for every action there is an equal and opposite reaction?

a)

1st Law

b)

2nd Law

c)

3rd Law

17.

Which law states that an object at rest stays at rest and an object in motion stays in motion unless an unbalanced force acts on it?

a)

1st Law

b)

2nd Law

c)

3rd Law

18.

Henry sees a basketball and decides to put in motion. What kind of force does Henry use to move the ball?

a)

small

b)

balanced

c)

equal

d)

unbalanced

19.

Which activity would BEST demonstrate Newton's law of Inertia?

a)

A plate sits on a table top.

b)

A lady pushes a grocery cart.

c)

A child jumps on a trampoline.

d)

A boy swings a baseball bat.

20.

Which activity would BEST demonstrate the Law of Action/Reaction?

a)

A car traveling down the road.

b)

A rocket launching to space.

c)

A soccer ball sitting on the ground.

d)

A lady pushing a grocery cart.

21.

Which activity would BEST demonstrate the Law of Force and Acceleration?

a)

A lady pushes a grocery cart.

b)

A boy swings a baseball bat.

c)

A soccer ball sits on the ground.

d)

A rocket launches into space.

22.

What is the name of Newton's 1st Law of Motion?

a)

Law of Force and Acceleration

b)

Law of Action / Reaction

c)

Law of Inertia

23.

What is the name of Newton's 2nd Law of Motion?

a)

Law of Force and Acceleration

b)

Law of Inertia

c)

Law of Action / Reaction

24.

What is the name of Newton's 3rd Law of Motion?

a)

Law of Force and Acceleration

b)

Law of Inertia

c)

Law of Action / Reaction

25.

A force that opposes motion between objects that are touching is called...

a)

motion

b)

friction

c)

velocity

d)

acceleration

26.

When there is an INCREASE in MASS of an object you will have a DECREASE in ______________.

a)

friction

b)

acceleration

c)

force

d)

gravity

27.

Mary is riding in a car when the driver suddenly slams on the brakes. Mary is jerked forward out of her seat. This is an example of which law of motion?

a)

2nd Law

b)

1st Law

c)

3rd Law

28.

A jellyfish swims through the water by pulling in water and then pushing the water back out in the opposite direction. This is an example of which law of motion?

a)

1st Law

b)

2nd Law

c)

3rd Law

29.

Billy pushes his little brother on a sled through the snow. He then tries to push his father on the the same sled. He noticed that it was much harder to push his father. Which law is this an example of?

a)

1st Law

b)

2nd Law

c)

3rd Law

30.

Which law is this picture an example of?

a)

Law of Inertia

b)

Law of Action / Reaction

c)

Law of Force and Acceleration

31.

Which law is this picture an example of?

a)

Law of Inertia

b)

Law of Force and Acceleration

c)

Law of Action / Reaction

32.

Which law is this picture an example of?

a)

Law of Inertia

b)

Law of Force and Acceleration

c)

Law of Action / Reaction

33.

Ted is playing with a yoyo outside. When he pushes the yoyo downward it returns back to him with the same force. Which law is this an example of?

a)

1st Law

b)

2nd Law

c)

3rd Law

34.

Beth's bike remains stopped at the intersection until she begins pedaling again. Which law is this an example of?

a)

1st Law

b)

2nd Law

c)

3rd Law

35.

m/s is a unit for

a)

mass

b)

force

c)

acceleration

d)

velocity

36.

kg is a unit that represents

a)

force

b)

velocity

c)

mass

d)

momentum

37.

When one variable increases and another decreases, on a graph, it is said to have a ___________________ relationship

a)

directly proportional

b)

inversely proportional

c)

indirectly proportional

d)

no relationship

38.

When one variable increases and the other also increases, on a graph, it is said to have a ___________________ relationship

a)

directly proportional

b)

inversely proportional

c)

indirectly proportional

d)

no relationship

39.

Forces come in pairs

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

40.

Law of Inertia

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

41.

For every action, there is an equal and opposite reaction

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

42.

F=ma

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

43.

This example can be applied to which law?

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

44.

This example can be applied to which law?

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

45.

An object in motion will stay in motion, or an object at rest will stay at rest unless acted on by an unbalanced force

a)

Newton's 1st law

b)

Newton's 2nd law

c)

Newton's 3rd law

d)

Law of conservation of momentum

46.
A magician pulls a tablecloth out from under dishes and glasses on a table without disturbing them.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
47.

A person’s body is thrown outward as a car rounds a curve on a highway.

a)

Newton's 1st Law

b)

Newton's 2nd Law

c)

Newton's 3rd Law

d)

None of them

48.
Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
49.
A picture is hanging on a wall and does not move.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
50.
The sum of all forces acting on an object and direction
a)
Contact Force
b)
Balanced Force
c)
Unbalanced Force
d)
Net Force
51.
Are forces balanced or unbalanced when a car is moving at a constant speed in a straight line?
a)
Balanced
b)
Unbalanced
52.
Are forces balanced or unbalanced when a marble speeds up rolling down a ramp?
a)
Balanced
b)
Unbalanced
53.
Ted is trying to move a fridge through his house, he gets stuck on a carpet and even though he is pushing the fridge, it is not moving. What force is acting against him?
a)
gravity
b)
friction
c)
air
d)
mass
54.
Balanced or unbalanced?
a)
balanced
b)
unbalanced
55.
Forces have both _________ and direction.
a)
Magnitude
b)
Gravity
c)
Speed
d)
Height
56.
Name the missing force...
a)
weight force
b)
normal force
c)
applied force
d)
frictional force
57.
Name the missing force...
a)
frictional force
b)
weight force
c)
thrust
d)
buoyant force
58.
Name the missing force...
a)
push
b)
weight force
c)
tension force
d)
drag
59.

A leftward force is applied to a crate to push it across the floor at a constant speed. Which is the correct force diagram?

a)
b)
c)
d)
60.

A rightward force is applied to a dresser to accelerate it to the right across the bedroom floor.

a)
b)
c)
d)
61.

A hockey puck glides to the right across the ice at a constant speed.

a)
b)
c)
d)
62.

A downward-moving skydiver who has just opened the parachute is slowing down.

a)
b)
c)
d)
63.

The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:

a)

normal

b)

abnormal

c)

static

d)

inertia

64.

In a force diagram the size/length of the arrow tells you this about the force:

a)

the strength of the force

b)

the distance of the force

c)

the direction of the force

65.

This diagram can be used to indicate which of the following? (TWO correct answers)

a)

a object at rest

b)

an object moving at a constant velocity (speed)

c)

an object accelerating

d)

(Trick question -- there is only one correct answer)

e)

an object decelerating

66.

Which way is the object moving?

a)

it's either not moving or moving at a constant speed due to balanced forces

b)

to the right

c)

to the bottom

d)

up

67.

The hockey puck is moving at a constant velocity across the ice. What forces does the puck experience at this moment?

a)

None

b)

Gravity

c)

Gravity and Normal

d)

Gravity, Normal, and Friction

e)

Gravity, Normal, Friction, and Applied

68.

The coffee cup in the picture is at rest on the table. What is true about the Normal force?

a)

The normal force is exactly 15

b)

The normal force is less than 15

c)

The normal force is more than 15

d)

The normal force is -10

69.

What is the NET FORCE of this diagram?

a)

17 N, right

b)

17 N, left

c)

23 N, right

d)

12 N, up

70.

Which diagram best shows person pushing a couch (accelerating) across the floor?

a)
b)
c)
d)
71.

Which of the following best describes the object in this diagram.

a)

A box sitting on the floor.

b)

A hockey puck gliding to the right.

c)

An athlete running to the right.

d)

A skateboarding gliding to the left.

72.
What is the net force
a)
10 N
b)
0 N
c)
25 N
d)
1 N
73.
What is the net force?
a)
40 N left
b)
0 N Balalnced
c)
400 N right
d)
40 N right
74.
What is the net force?
a)
400 N Up
b)
400 N Down
c)
- 400 N Down
d)
800 N Down
75.
Which is moving at a constant speed or not at all?
a)
a
b)
b
c)
c
d)
d
76.
Which is moving up?
a)
a & b
b)
b
c)
b & c
d)
d
77.

The hockey puck is moving at a velocity of 20 m/s. If the forces on the puck are in equilibrium, what will the puck's velocity be 2 seconds later?

a)

0 m/s

b)

1 m/s

c)

2 m/s

d)

10 m/s

e)

20 m/s

78.

Which equation would accurately describe the forces on this cup of coffee?

a)

Fn − Fg = 0F_n\ -\ F_g\ =\ 0

b)

Fn×Fg = 0F_n\times F_g\ =\ 0

c)

Fn−10FgF_n-10F_g

d)

Fn−Fg = −10F_n-F_g\ =\ -10

79.

A chandelier is hanging from the ceiling. If the force of gravity on the chandelier is 120 N, the force of tension must be ...

a)

0 N

b)

12 N

c)

60 N

d)

120 N

80.

A squirrel sits on the ground and eats a donut. If the ground pushes up on the squirrel with a force of 11 N, The squirrel and donut together weigh ...

a)

less than 11 N

b)

Exactly 11 N

c)

More than 11 N

81.

The car in the picture is moving at a constant velocity. What forces does the car experience?

a)

Gravity

b)

Gravity and Normal

c)

Gravity, Normal, and Friction

d)

Gravity, Normal, Friction, and Applied

82.

The Car in the picture is moving to the right at a constant velocity. Any friction present would be pushing the car to the ...

a)

Up

b)

Right

c)

Down

d)

Left

83.

Two books rest on the same table. Book A weighs 20 N. Book B has a mass of 3 kg. Which one has a greater force of gravity on it?

a)

The same

b)

Book A

c)

Book B

84.

A man pushes a box across the floor at a constant velocity. Which formula describes the horizontal forces on the box?

a)

FP − Ff = 0F_P\ -\ F_f\ =\ 0

b)

Fp+Fg − Ff = 0F_p+F_g\ -\ F_f\ =\ 0

c)

FP −10Fg = 0F_P\ -10F_g\ =\ 0

d)

Fp ×Ff=0F_{p\ }\times F_f=0

85.

A man pushes a box across the floor at a constant velocity. Which formula describes the vertical forces on the box?

a)

 FP − Fg = 0F_P\ -\ F_g\ =\ 0 

b)

Fp+Fg − Ff = 0F_p+F_g\ -\ F_f\ =\ 0

c)

 Fn −10Fg = 0F_n\ -10F_g\ =\ 0 

d)

 Fn−mg = 0F_n-mg\ =\ 0 

86.
A measurement of how fast an object is moving
a)
Velocity
b)
Speed
c)
Vector
d)
Acceleration
87.
If you travel 10 miles in 5 minutes, what is your speed?
a)
10 mi/min
b)
15 mi/min
c)
50 mi/min
d)
2 mi/min
88.
What is happening in this graph from point A to B?
a)
The object is accelerating.
b)
The object is not moving.
c)
The object is decelerating.
d)
The object is moving at a constant speed.
89.
What is happening in this graph from point B to C?
a)
The object is going down a hill.
b)
The object is returning to its starting location.
c)
The object is slowing down.
d)
The object is staying still.
90.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
91.
What is happening at C?
a)
Stationary
b)
Accelerating
c)
Fast steady speed; moving away from the starting position
d)
Slower steady speed; moving away from the starting position
92.
What is happening at D?
a)
Stationary
b)
Accelerating
c)
Fast steady speed; moving away from the starting position
d)
Slower steady speed; moving away from the starting position
93.
What is happening at A?
a)
Stationary
b)
Accelerating
c)
Slower steady speed; moving away from the starting position
d)
Steady speed; returning to start position
94.
What is the formula to calculate speed?
a)
S = t/d
b)
S = d/t
c)
S = d x t
d)
S = t x d
95.
What does this graph represent?
a)
Constant Speed
b)
Acceleration
c)
Not moving
96.
How long did it take this object to travel 10 m?
a)
0 s
b)
10 s
c)
15 s
d)
20 s
97.
How long did it take this object to travel back to its reference/starting point?
a)
20 s
b)
30 s
c)
60 s
d)
100 s
98.
At 60 seconds, how far had this object traveled? 
a)
0 m
b)
10 m
c)
20 m
d)
40 m
99.
What does this graph represent?
a)
Constant speed
b)
Acceleration
c)
Not moving
100.
Which runner won the race?
a)
A
b)
B
c)
C
101.
Which runner had a head start?
a)
A
b)
B
c)
C
102.
What is this graph showing?
a)
Constant Speed
b)
Acceleration (speeding up)
c)
Deceleration (slowing down)
d)
No motion
103.
What is this graph showing?
a)
Constant Speed
b)
Acceleration (speeding up)
c)
Deceleration (slowing down)
d)
No motion
104.
According to the graph how far does the person travel in the first 5 seconds?
a)
2 m
b)
10 m
c)
0 m
d)
5 m
105.
What kind of acceleration is shown here?
a)
positive
b)
negative
c)
none
d)
varies
106.
What kind of acceleration is shown here?
a)
positive
b)
negative
c)
none
d)
varies
107.
What kind of acceleration is shown here?
a)
none
b)
positive
c)
negative
d)
varies
108.
What is the velocity?
a)
not moving
b)
increasing
c)
positive
d)
negative
109.
What is the velocity?
a)
positive
b)
negative
c)
decreasing
d)
increasing
110.
What is the velocity?
a)
0 m/s
b)
positive m/s
c)
negative m/s
d)
decreasing
111.
Is the speed constant or non-constant?
a)
constant
b)
non-constant
112.
Is the speed constant or non-constant?
a)
constant
b)
non-constant
113.
Is the speed constant or non-constant?
a)
constant
b)
non-constant
114.
Which section of the graph shows decreasing velocity?
a)
CD
b)
DE
c)
EF
d)
GH
115.
Which section of the graph shows increasing velocity?
a)
AB
b)
BC
c)
DE
d)
EF
116.
Which section of the graph shows constant velocity?
a)
AB
b)
BC
c)
EF
d)
GH
117.
Which section of the graph shows acceleration?
a)
AB
b)
BC
c)
EF
d)
FG
118.
Which section of the graph shows deceleration?
a)
AB
b)
BC
c)
EF
d)
GH
119.

How is constant speed shown on a distance time graph ?

a)

Constant speed will curve in shapes of circles

b)

Graph would not be straight

c)

Constant speed shows no motion

d)

Constant speed is shown as a straight line .

120.

Which segment of this graph shows the speed of the car decreasing?

a)

Segement A

b)

Segment B

c)

Segment D

d)

Segment E

121.

A car traveling down the highway with it's cruise control set at a mph. This is represented with a line that moves up the graph diagonally on a distance time graph.

a)

Not moving

b)

Constant speed

c)

slowing down

d)

accelerating with a line that curves upward

122.

How does an inclined plane help make work easier ?

a)

It can lift heavy objects

b)

It can run constant circles

c)

It can move a weight from lower to higher elevation.

d)

It can hurt your back

123.

What is the speed of an object traveling 300 kn in six hours? What is the speed of the object?

a)

50km/hr

b)

60km/hr

c)

9km/hr

d)

None of the above

124.

If Jane pushes a piano across the floor with a force of 25 N and Bob pushes the piano in the same direction with a force of 15 N Are forces balanced or unbalanced?

a)

Forces are not balanced, The piano will move in the direction that it's being pushed.

b)

Forces are balanced, The piano will move in the direction that it's being pushed.

c)

Forces are balanced and equal

d)

35N

125.

If Jane pushes a piano across the floor with a force of 25 N and Bob pushes the piano in the same direction with a force of 15 N. Solve for the net force

a)

50N

b)

100N

c)

40N

d)

65N

126.
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
127.

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

128.

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

129.

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

130.

What is effort (input) distance?

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 distance an input force acts through

d)

the output work times the input distance

131.
Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground (W=Fd).
a)
270 J
b)
2646 J
c)
333 J
d)
3.00X10-3 J
132.

What is resistance (output) distance?

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 distance an input force moves a machine

d)

the distance through which the output force is exerted

133.
How can you determine the mechanical advantage of a pulley system?
a)
Count the number of rope/cable segments on each side of the pulleys, including the free end. If the free end is to be pulled down, subtract 1 from this number.
b)
Count the number of rope/cable segments on each side of the pulleys without including the free end.
c)
Count the number of rope/cable segments on the central pulleys.
d)
Count the number of rope/cable segments on each side of the pulleys, including the free end. If the free end is to be pulled down, subtract 10 from this number.
134.
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
135.

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

136.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
137.

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

138.

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

a)

2.4

b)

3.4

c)

4.4

139.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
140.
If you push a coffee mug 1.4 m using a force of 5 N, the work done on the mug is?
a)
7 J
b)
6 J
c)
8 J
d)
9 J
141.
How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?
a)
3.8 m
b)
3.7 m
c)
3.2 m
d)
3.6 m
142.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
143.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
resistance friction
c)
fulcrum
d)
friction
144.
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
145.

A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?

a)

1

b)

2.5

c)

5

d)

10

146.

What is the mechanical advantage of a lever that has an input arm of 3 meters and an output arm of 2 meters?

a)

1.5

b)

1

c)

0.67

d)

3

147.

A 5-meter ramp lifts objects to a height of 0.75 meters. What is the mechanical advantage of the ramp?

a)

6.67

b)

5.67

c)

5

d)

6

148.

What is the mechanical advantage of this pulley?

a)

.5

b)

1

c)

1.5

d)

2

149.

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

150.

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

151.

What is the mechanical advantage of this pulley system?

a)

4

b)

6

c)

8

d)

10

152.

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

a)

50

b)

60

c)

75

d)

90

153.

What is the mechanical advantage of this pulley?

a)

1

b)

2

c)

3

d)

4

154.

What is the effort required to lift a load of 170 newtons using this pulley system?

a)

57

b)

114

c)

85

d)

90

155.

An effort of 640 newtons is applied to this pulley system. What is the load that it will lift?

a)

1280

b)

1600

c)

1920

d)

2560

156.
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
157.
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
158.
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
159.
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)
1000
d)
100
160.
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
161.
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%

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