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14.1 and 2 Work, Power, Machines

Total questions: 102

Worksheet time: 1hrs 29mins

Name
Class
Date
1.
Any device that makes work easier is called a ______________________.
a)
Joule 
b)
prop
c)
lever
d)
machine
2.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
force
c)
fulcrum
d)
friction
3.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
Meter
4.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
5.
The efficiency of a machine can be increased by reducing __________________________. 
a)
effort
b)
force
c)
fulcrum
d)
friction
6.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
Meter
7.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
8.
 Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
9.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
10.
What is the unit for mass?
a)
Kilogram (Kg)
b)
Newton (N)
c)
Joule (J)
d)
Watt (W)
11.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
12.
Two or more simple machines used together is a 
a)
compound machine 
b)
wheel and axle 
c)
block and tackle 
d)
mechanical advantage 
13.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
14.
What is the formula for work?
a)
Force = work x distance
b)
Distance = force x work
c)
Work = force x distance
d)
Work = force x mass
15.

Fred kicks a ball with a force of 20N to George, who is 5M away. How much work was done to the ball?

a)

25J

b)

100J

c)

4J

d)

75J

16.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
17.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
18.
What is work?
a)
A push or pull.
b)
When the object moves in the same direction in which the force is exerted.
c)
A change in energy.
d)
The rate at which energy is transferred.
19.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
20.

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

21.
Which is doing work?
a)
pushing a wall
b)
holding a box
c)
picking up a pencil
d)
sitting in a chair
22.
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
23.

Your car is stuck in the mud. You push with 500 N of force but it never moves. How much work did you do?

a)

0 J

b)

500 J

c)

500 N

d)

0 N

24.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
25.

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

26.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

27.

what would 1m be an example of?

a)

work

b)

power

c)

time

d)

distance

28.

what would you solve for if given distance and force?

a)

work

b)

power

c)

time

d)

motion

29.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
30.

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

31.

What would you solve for if given time and work?

a)

power

b)

force

c)

distance

d)

work

32.

A kid applies a force of 70 N to a ball over 1.0 meters. How much work did he do on the ball? 

a)

70 J

b)
7.7 J 
c)
0.7 J 
d)
770 J 
33.
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
34.
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
35.
Work divided by time equals...
a)
energy
b)
power
36.

The FURTHER you move an object, the more work you do.

a)
True
b)
False
37.
A 50N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
38.
True or false
You do work only when you exert a force on an object and move it
a)
true
b)
false
39.
work is a measurement of how much force is applied over a certain
a)
distance
b)
velocity
c)
shape
d)
size
40.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
41.
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
42.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
43.

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

44.
Force is a _____ or _______
a)
simple    complex
b)
push     pull
c)
up      down
d)
in      out
45.

Power is defined as the quantity that measures the rate at which _____ is done.

a)
energy
b)
time
c)
work
d)
elasticity
46.

The SI unit of power is the (a)   .

47.

Which of the following is approximately equal to one horsepower?

a)

746 J

b)

746 W

c)

7460 N/m

d)

7460 J

48.

A 50N block is lifted 10 m. How much work was done?

a)

50000 J

b)

5000 J

c)

500 J

d)

50 J

49.

How much power is the tractor that drags a plow with a force of 50 N a distance of 10 meters in 20 seconds?

a)

25 Watts

b)

250 Joules

c)

100,000 Watts

d)

100,000 Joules

50.

What is the equation for power?

a)

P = Work/time

b)

P = Force/time

c)

P = time/distance

d)

P = Work * time

51.

Do we do more work when we walk or run up a flight of stairs?

a)

walk

b)

run

c)

they are the same

52.

Do we use more power when we walk or run up a flight of stairs?

a)

walk

b)

run

c)

they are the same

53.
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
54.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
55.

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

56.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
57.

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

58.

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

59.
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
60.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
61.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
62.

If the direction an object is displaced is the same as the direction of a force applied to it:

a)

Positive work is done.

b)

Negative work is done.

c)

No work is done.

63.

What is the unit of power as mentioned in the learning material?

a)

Newton

b)

Joule

c)

Watt

d)

Pascal

64.

Work is measured in which units?

a)

Newtons

b)

Joules

c)

Watts

d)

Joule/sec

65.

Joel and Jerry push against a car that has stalled, trying unsuccessfully to get it moving. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do on the car.

a)

Joel does 75% more work than Jerry.

b)

Joel does 50% more work than Jerry.

c)

Jerry does 50% more work than Joel.

d)

Joel does 25% more work than Jerry.

e)

Neither of them does any work.

66.

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will do the most work?

a)

Bro A

b)

Bro B

c)

They both will do the same work

d)

Can't tell without knowing the weight they are lifting

67.

Two people are lifting the same weight as shown in the animation. If they both do 10 reps, who will supply the most power?

a)

Bro A

b)

Bro B

c)

They both will do the same work

d)

Can't tell without knowing the weight they are lifting

68.

In science, work is done when a(n) (a)   acts on an object in the direction the object moves.

69.
Which of the following is true about work?
a)
It measures how quickly an object accelerates
b)
It measures how much effort is applied over a distance.
c)
It measures the change of an object's rate of speed.
d)
It measures how much time it takes to move an object.
70.
What units do we use to measure work?
a)
watts
b)
newtons
c)
joules
d)
meters
71.
A kid throws a ball with a force of 70N over 1.1 meters. How much work did he do?
a)
77 joules
b)
70 joules
c)
7.7 joules
d)
11 joules
72.

Use one of these equations to answer this question (W = Fd) and (P = W/t): Toph pushes against the turret with 500 Newtons of Force. It stays in place. How much work has been done?

a)

1200 Joules of work

b)

500 Joules of work

c)

No work has been done

d)

200,000 Joules of work

73.

Use one of these equations to answer this question (W = Fd) and (P = W/t): When Aang fights Ozai, he wields 100,000 Joules in 25 seconds. What is his power?

a)

4,000 J/s (Watts)

b)

250,000 J/s (Watts)

c)

125,000,000 Newtons

d)

2,000,000 Joules

74.

The force exerted on the machine is the ______ _______, and the force the machine exerts on an object is called the _______ _______.

a)

output force, input force

b)

input force, output force

c)

greater force, lesser force

75.

The input force multiplied by the input distance equals the

a)

input work.

b)

output work.

c)

work.

d)

power.

76.

The output force multiplied by the output distance equals the

a)

input work.

b)

work.

c)

output work.

d)

power.

77.

A machine can increase the __________ exerted, the ________ moved, or change an object's ____________.

a)

force, distance, direction.

b)

force, distance, area.

c)

force, distance, power.

78.

The _________ of a machine compares the output work to the input work.

a)

efficiency

b)

force

c)

work

d)

shininess

79.
What is a simple machine?
a)
a device that has only one working motor
b)
a device that makes work easier
c)
a device that makes more work for a job
d)
device that is made up of two or more machines
80.
A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  
a)
wedge
b)
screw
c)
lever
d)
inclined plane 
81.

The work done by a machine is always less than the work done on a machine because of (a)   .

82.
The resistance to motion created by two objects rubbing against each other is called:
a)

friction

b)

inertia

c)

gravity

d)

static

83.

Machines make work easier by doing what?

a)

Changing the size of a force needed

b)

Changing the direction of a force

c)

changing the distance over which a force acts

d)

all of the above

84.

If a machine increases the distance over which a force is exerted, the force required to do a given amount of work (a)   .

85.

Select the definition for input force.

a)

The amount of force exerted by a machine

b)

The amount of friction slowing the speed of a machine

c)

The amount of work done by a machine

d)

The amount of force exerted on a machine

86.

True or False? Every machine uses some of its work input to overcome friction.

a)

True

b)

False

87.

The force exerted by a machine is called the (a)   force.

88.

True or False? Output work is always less than input work.

a)

True

b)

False

89.
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
90.

What is (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

91.

What is (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

92.

What is (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

93.

What is (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

94.

Name the 6 simple machines

4 lines
95.

If a pulley does 43 J of work to lift a crate, is this work input or output?

a)

input

b)

output

96.

If Shrek puts 1200J of work into a lever to lift a boulder, is this work input or output?

a)

input

b)

output

97.

What does the W in this equation stand for?

a)

watt

b)

work

c)

weight

d)

width

98.

What are we looking for in this equation?

a)

power

b)

weight

c)

width

d)

time

99.

What equation should you use to determine the efficiency of a machine?

a)

%Eff=workoutworkin⋅100\%Eff=\frac{work_{out}}{work_{in}}\cdot100

b)

workout=%Eff⋅workin100work_{out}=\frac{\%Eff\cdot work_{in}}{100}

c)

workin=workout⋅100%Effwork_{in}=\frac{work_{out}\cdot100}{\%Eff}

100.

When you solve for efficiency, what unit should you use for your answer?

a)

joules (J)

b)

newtons (N)

c)

percent (%)

101.

You input 100 J of work to a machine that gives 50 J of work output. What is the machine's efficiency?

a)

150%

b)

50%

c)

2%

d)

5000%

102.

You solve a problem and find that you have machine with 150% efficiency. Can your answer be correct?

a)

No, the answer is wrong.

b)

Yes, the answer can be right.

c)

Not enough information to tell.

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