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Levers

The document provides an overview of simple machines, focusing on levers. It defines a lever as a stiff structure that pivots on a fixed point called the fulcrum. There are three main parts of a lever: the resistance or load, which is the object being moved; the effort force or input force, which is the work applied; and the fulcrum, which is the fixed pivot point. Levers are classified into three classes based on the position of the load, effort, and fulcrum. Examples of each class of lever are given, along with diagrams showing the key parts. The document tests the reader's understanding of lever classification and parts through examples.

Education◦

Simple Machines Part 1
by Mrs. Burch 9/8/17

A simple machine is a mechanical
device that makes work easier for
us by allowing us to push or pull
something over a longer distance.

There are 5 basic types of simple
machines.

Introduction to Levers
https://youtu.be/YlYEi0PgG1g

Watch this video of a truck
being lifted with a lever.
https://youtu.be/fX3doG_z9l4

Introducing (drum roll, please)
…the Lever!

A lever includes a stiff structure such as a wood
board that pivots on a fixed point called the fulcrum.

A seesaw (a.k.a. teeter totter)
is a lever.

Every Lever has 3 parts:
1. Resistance (a.k.a. Load)
2. Effort Force (a.k.a. Input Force)
3. Fulcrum

Well, let’s look at the 1st
part...Resistance (a.k.a. Load).

The resistance (load) is what
you are trying to lift or move.

Why do you think the object you
are trying to move is called the
“resistance”?

Well...the heavier the object, the
more it “resists” being moved.

What is the resistance or load in
this picture?

Now, let’s look at the 2nd
part of a
lever...Effort Force (a.k.a. Input
Force).

The Effort Force (a.k.a. Input
Force) is the effort or work you
have to put in, so the object will
move.
Which letter shows the effort force?

In this use of the lever, what is the
effort force (input force)? What is
the resistance (load)?
See answer
on next slide.

This man must push down on the
board to cause the tire to lift. So,
the effort force is the man pushing
down...

...and the resistance, or load, is the
tire.

Lastly, let’s look at the 3rd
part of
a lever...the Fulcrum.

1. The work you have to put in
to make the object move is
called...

1. The work you have to put in
to make the object move is
called...effort force or input
force.

2. The object that you want to
lift or move is called...

2. The object that you want to
lift or move is called...the
resistance or load.

3. The fixed point on which the
lever pivots is called...

3. The fixed point on which the
lever pivots is called...the
fulcrum.

4. The load is...the object you
are trying to lift or move.

5. The other word for “load”
is...“resistance”.

6. Effort force is...the work you
put into moving the object.

7. Another term for “effort force”
is...“input force”.

8. The fulcrum is...the fixed
point on which the lever
pivots.

The order of the load, effort, and
fulcrum determines the lever’s
class. There are 3 classes of
levers.

A 1st
class lever has the
fulcrum somewhere between
the effort force and the load.

Go outside to demonstrate 2
levers in action.

The load moves in the opposite
direction of the effort force.

So, if you push down on one
end of a lever, the load at the
opposite end will move ___ and
vice versa.

If you push down on one end of
a lever, the load at the opposite
end will move _up_ and vice
versa.

1st
Class Lever
Question #1: What do you think will happen
if the fulcrum is closer to the load than to the
effort?
Effort
Load
Fulcrum

1st
Class Lever
Answer #1:
There is a gain in force, but there is a loss
in speed and distance.
Effort
Load
Fulcrum

1st
Class Lever
What does that mean?
Effort
Load
Fulcrum

Notice that the load doesn’t go as high
when the fulcrum is closer to the load.
Therefore, there is a loss in distance.

But, if the fulcrum is close to the load, it
will be a lot easier to move. Therefore,
there is a gain in force.
More effort needed
Less effort needed

1st
Class Lever
Question #2: What do you think would
happen if the fulcrum is closer to the effort
than the load?
Effort
Load

1st
Class Lever
Answer #2:
There is a loss in force, but there is a gain
in speed and distance.
Effort
Load

The load moved higher when the fulcrum
is closer to the effort. Therefore, there is
a gain in distance.

But, it is much harder to make the load go
up when the fulcrum is closer to the effort.
Therefore, there is a loss in force.
Needs a lot more effort
Needs less effort

What are some examples of 1st
class levers?

A seesaw is a 1st
class lever.
Where is the fulcrum? Effort force? Load?

Knowing that to make the effort easier, the
fulcrum needs to be closer to the load than the
effort, how could a tool manufacturer make it
even easier for you to use the pliers?

Answer: A tool manufacturer could make the
handles longer to make it even easier for you.

This is why you want to use
pruners with really long handles
to cut thick branches.

A door handle is a 1st
class
lever.
Where is the force? The load? The fulcrum?

Where is the force? The load? The fulcrum?
Force
Fulcrum
Load

A bicycle brake lever is a 1st
class lever.

The load is where the brake pads
squeeze the tire.

A dolly (hand truck) is a 1st
class
lever.

Which is the force? The load?
The fulcrum?

Which is the force? The load?
The fulcrum?
Force
Load
Fulcrum

A railroad track switch.
fulcrum
fulcrum
load
load
effort
effort

A hammer pulling a nail is also a 1st
class lever.
Where is the
fulcrum?
The effort
force?
The load?

A hammer pulling a nail is also a 1st
class lever.
Where is the
fulcrum?
The effort
force?
The load?
Load
Effort Force
Fulcrum

A pry bar is similar to a hammer
and is another 1st
class lever.

Scissors are two 1st
class levers put
together.
loadload

Okay, now we know what a 1st
class lever is like. What about a
2nd
class lever? What is it like?

A 2nd
class lever puts the load
somewhere between the effort
force and the fulcrum.

The fulcrum is at one of the
ends of the lever and is usually
closer to the load.

What are some examples of 2nd
class levers?

The wheelbarrow is the most
famous 2nd
class lever.

Which arrow points to the load?
The effort? The fulcrum?

Which arrow points to the load?
The effort? The fulcrum?
fulcrum
load
effort

Levers

1.
Simple Machines Part1 by Mrs. Burch 9/8/17
2.
A simple machineis a mechanical device that makes work easier for us by allowing us to push or pull something over a longer distance.
3.
There are 5basic types of simple machines.
4.
The 1st type ofsimple machine is...
5.
The Lever
6.
Introduction to Levers https://youtu.be/YlYEi0PgG1g
8.
Watch this videoof a truck being lifted with a lever. https://youtu.be/fX3doG_z9l4
9.
Introducing (drum roll,please) …the Lever!
10.
A lever includesa stiff structure such as a wood board that pivots on a fixed point called the fulcrum.
11.
A seesaw (a.k.a.teeter totter) is a lever.
12.
Every Lever has3 parts: 1. Resistance (a.k.a. Load) 2. Effort Force (a.k.a. Input Force) 3. Fulcrum
13.
Okay, but whatARE these 3 parts?!?!
14.
Well, let’s lookat the 1st part...Resistance (a.k.a. Load).
15.
The resistance (load)is what you are trying to lift or move.
16.
Why do youthink the object you are trying to move is called the “resistance”?
17.
Well...the heavier theobject, the more it “resists” being moved.
18.
What is theresistance or load in this picture?
19.
What is theresistance or load in this picture?
20.
What is theresistance or load in this picture?
21.
What is theresistance or load in this picture?
22.
Now, let’s lookat the 2nd part of a lever...Effort Force (a.k.a. Input Force).
23.
The Effort Force(a.k.a. Input Force) is the effort or work you have to put in, so the object will move. Which letter shows the effort force?
24.
In this useof the lever, what is the effort force (input force)? What is the resistance (load)? See answer on next slide.
25.
This man mustpush down on the board to cause the tire to lift. So, the effort force is the man pushing down...
26.
...and the resistance,or load, is the tire.
27.
Lastly, let’s lookat the 3rd part of a lever...the Fulcrum.
28.
The Fulcrum isa fixed pivot point.
29.
“Fixed” means thefulcrum doesn’t move.
30.
Where is thefulcrum?
31.
Where is thefulcrum?
32.
Where is thefulcrum?
33.
Where is thefulcrum?
34.
Where is thefulcrum?
35.
Where is thefulcrum?
36.
Let’s review theparts of a lever:
37.
1. The workyou have to put in to make the object move is called...
38.
1. The workyou have to put in to make the object move is called...effort force or input force.
39.
2. The objectthat you want to lift or move is called...
40.
2. The objectthat you want to lift or move is called...the resistance or load.
41.
3. The fixedpoint on which the lever pivots is called...
42.
3. The fixedpoint on which the lever pivots is called...the fulcrum.
43.
4. The loadis...
44.
4. The loadis...the object you are trying to lift or move.
45.
5. The otherword for “load” is...
46.
5. The otherword for “load” is...“resistance”.
47.
6. Effort forceis...
48.
6. Effort forceis...the work you put into moving the object.
49.
7. Another termfor effort force is...
50.
7. Another termfor “effort force” is...“input force”.
51.
8. The fulcrumis...
52.
8. The fulcrumis...the fixed point on which the lever pivots.
53.
Good job!
54.
The order ofthe load, effort, and fulcrum determines the lever’s class. There are 3 classes of levers.
55.
A 1st class leverhas the fulcrum somewhere between the effort force and the load.
56.
Go outside todemonstrate 2 levers in action.
57.
The load movesin the opposite direction of the effort force.
58.
So, if youpush down on one end of a lever, the load at the opposite end will move ___ and vice versa.
59.
If you pushdown on one end of a lever, the load at the opposite end will move _up_ and vice versa.
60.
1st Class Lever Question #1:What do you think will happen if the fulcrum is closer to the load than to the effort? Effort Load Fulcrum
61.
1st Class Lever Answer #1: Thereis a gain in force, but there is a loss in speed and distance. Effort Load Fulcrum
62.
1st Class Lever What doesthat mean? Effort Load Fulcrum
63.
Notice that theload doesn’t go as high when the fulcrum is closer to the load. Therefore, there is a loss in distance.
64.
But, if thefulcrum is close to the load, it will be a lot easier to move. Therefore, there is a gain in force. More effort needed Less effort needed
65.
1st Class Lever Question #2:What do you think would happen if the fulcrum is closer to the effort than the load? Effort Load
66.
1st Class Lever Answer #2: Thereis a loss in force, but there is a gain in speed and distance. Effort Load
67.
The load movedhigher when the fulcrum is closer to the effort. Therefore, there is a gain in distance.
68.
But, it ismuch harder to make the load go up when the fulcrum is closer to the effort. Therefore, there is a loss in force. Needs a lot more effort Needs less effort
69.
What are someexamples of 1st class levers?
70.
A seesaw isa 1st class lever. Where is the fulcrum? Effort force? Load?
71.
Pliers are a1st class lever.
72.
Knowing that tomake the effort easier, the fulcrum needs to be closer to the load than the effort, how could a tool manufacturer make it even easier for you to use the pliers?
73.
Answer: A toolmanufacturer could make the handles longer to make it even easier for you.
74.
This is whyyou want to use pruners with really long handles to cut thick branches.
75.
A door handleis a 1st class lever. Where is the force? The load? The fulcrum?
76.
Where is theforce? The load? The fulcrum? Force Fulcrum Load
77.
A bicycle brakelever is a 1st class lever.
78.
Where is theload?
79.
The load iswhere the brake pads squeeze the tire.
80.
A dolly (handtruck) is a 1st class lever.
81.
Which is theforce? The load? The fulcrum?
82.
Which is theforce? The load? The fulcrum? Force Load Fulcrum
83.
A power switchis a 1st class lever.
84.
A railroad trackswitch. fulcrum fulcrum load load effort effort
85.
A hammer pullinga nail is also a 1st class lever. Where is the fulcrum? The effort force? The load?
86.
A hammer pullinga nail is also a 1st class lever. Where is the fulcrum? The effort force? The load? Load Effort Force Fulcrum
87.
A pry baris similar to a hammer and is another 1st class lever.
88.
Scissors are two1st class levers put together. loadload
89.
Okay, now weknow what a 1st class lever is like. What about a 2nd class lever? What is it like?
90.
A 2nd class leverputs the load somewhere between the effort force and the fulcrum.
91.
The fulcrum isat one of the ends of the lever and is usually closer to the load.
92.
What are someexamples of 2nd class levers?
93.
The wheelbarrow isthe most famous 2nd class lever.
94.
The foot isa 2nd class lever.
95.
A stapler isa 2nd class lever.
96.
A bottle openeris a 2nd class lever.
97.
Which arrow pointsto the load? The effort? The fulcrum?
98.
Which arrow pointsto the load? The effort? The fulcrum? fulcrum load effort
99.
A nutcracker usestwo 2nd class levers put together.
100.
Nail clippers usetwo 2nd class levers.

Editor's Notes

#2 image: https://3.bp.blogspot.com/-Z5kjfXP6Fsg/V1Cm8cb67bI/AAAAAAAAACo/g9EqbtneKZA4pueXeEwrEvxvEkXYKno3wCLcB/s1600/1.png
#3 image: https://3.bp.blogspot.com/-Z5kjfXP6Fsg/V1Cm8cb67bI/AAAAAAAAACo/g9EqbtneKZA4pueXeEwrEvxvEkXYKno3wCLcB/s1600/1.png
#4 image: https://3.bp.blogspot.com/-Z5kjfXP6Fsg/V1Cm8cb67bI/AAAAAAAAACo/g9EqbtneKZA4pueXeEwrEvxvEkXYKno3wCLcB/s1600/1.png
#10 image: http://www.cool-science-projects.com/images/man-and-lever.jpg
#11 image: http://www.cool-science-projects.com/images/man-and-lever.jpg
#12 image: http://www.ruoff.com/blog/wp-content/uploads/2012/04/teeter-totter.jpg
#14 image: http://www.ideachampions.com/weblogs/Confused.jpg
#15 image: http://www.sciencekids.co.nz/images/pictures/coloringpages/dictionarylookup.jpg
#16 image: http://eschooltoday.com/science/simple-machines/images/parts-of-a-lever.jpg
#17 image: https://www.eres-group.com/wp-content/uploads/2016/02/question.png
#18 image: https://bigseadesign.com/wp-content/uploads/2012/09/horse.jpe
#19 image: https://i.ytimg.com/vi/R1pMrDfv8SY/maxresdefault.jpg Answer: Dirt
#20 image: http://www.bounceenergy.com/blog/wp-content/uploads/2012/04/iStock_000005227652Small.jpg Answer: Boxes
#21 image: https://drinks-dvq6ncf.netdna-ssl.com/wordpress/wp-content/uploads/2012/09/images.jpeg Answer: The bolt
#22 image: http://g02.a.alicdn.com/kf/HTB1GQ4hIVXXXXXRXpXXq6xXFXXXV/-Quick-high-quality-Walnut-Cracker-Zinc-Alloy-Nutcracker-Sheller-Nut-Opener-easy-to-use-Kitchen.jpg Answer: The walnut
#23 image: http://www.sciencekids.co.nz/images/pictures/coloringpages/dictionarylookup.jpg
#24 Answer: A
#25 image: http://www.scienceclarified.com/images/uesc_06_img0346.jpg
#26 image: http://www.scienceclarified.com/images/uesc_06_img0346.jpg
#27 image: http://www.scienceclarified.com/images/uesc_06_img0346.jpg
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#30 image: http://educationwithfun.com/pluginfile.php/1193/mod_page/intro/lever.PNG
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#34 image: http://g02.a.alicdn.com/kf/HTB1GQ4hIVXXXXXRXpXXq6xXFXXXV/-Quick-high-quality-Walnut-Cracker-Zinc-Alloy-Nutcracker-Sheller-Nut-Opener-easy-to-use-Kitchen.jpg
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#94 image: http://www.school-for-champions.com/machines/images/levers_wheelbarrow.jpg
#95 image: http://3.bp.blogspot.com/-_wW7QAGmgw4/UGspmLZPZxI/AAAAAAAAADo/C13OGHm9yXM/s1600/2_class.gif;
#96 image: http://www.school-for-champions.com/machines/images/levers_classes_stapler.jpg
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#113 image: https://upload.wikimedia.org/wikipedia/commons/b/b0/Hammer-lever_diagram.jpg
#114 image: https://image.slidesharecdn.com/levers2-150317160359-conversion-gate01/95/levers-12-638.jpg?cb=1426608291
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#118 image: http://www.happyfolding.com/files/tweezers.png
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#121 image: http://rpgaspiping.com/blog/wp-content/uploads/2014/06/38024-hi-shovel.jpg
#122 image: http://www.tpub.com/machines/1.htm3.gif
#123 image: http://www.tpub.com/machines/1.htm3.gif
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#125 image: https://www.jbprince.com/images/U900_zoom.jpg
#126 image: https://media.qcsupply.com/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/3/4/340640_1__1.jpg
#127 image: https://media.qcsupply.com/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/3/4/340640_1__1.jpg
#128 image: https://lifescitpjhs.wikispaces.com/file/view/gBottleOpener.PNG/333794070/543x411/gBottleOpener.PNG
#129 image: https://lifescitpjhs.wikispaces.com/file/view/gBottleOpener.PNG/333794070/543x411/gBottleOpener.PNG
#130 image: http://wiki.dtonline.org/images/thumb/2/21/WheelbarrowLabelled.png/300px-WheelbarrowLabelled.png
#131 image: http://wiki.dtonline.org/images/thumb/2/21/WheelbarrowLabelled.png/300px-WheelbarrowLabelled.png
#132 http://starecat.com/content/wp-content/uploads/no-wait-im-not-ready-dog-hit-by-a-frisbee.jpg
#133 image: https://duellingdialysis.files.wordpress.com/2011/03/homer_woohoo.jpg
#137 info: http://www.sheknows.com/living/articles/1028977/how-do-levers-work
#143 image: http://images.clipartpanda.com/sad-girl-stick-figure-image.png
#148 https://youtu.be/E5pZ7uR6v8c

Levers

1.
Simple Machines Part1 by Mrs. Burch 9/8/17
2.
A simple machineis a mechanical device that makes work easier for us by allowing us to push or pull something over a longer distance.
3.
There are 5basic types of simple machines.
4.
The 1st type ofsimple machine is...
5.
The Lever
6.
Introduction to Levers https://youtu.be/YlYEi0PgG1g
8.
Watch this videoof a truck being lifted with a lever. https://youtu.be/fX3doG_z9l4
9.
Introducing (drum roll,please) …the Lever!
10.
A lever includesa stiff structure such as a wood board that pivots on a fixed point called the fulcrum.
11.
A seesaw (a.k.a.teeter totter) is a lever.
12.
Every Lever has3 parts: 1. Resistance (a.k.a. Load) 2. Effort Force (a.k.a. Input Force) 3. Fulcrum
13.
Okay, but whatARE these 3 parts?!?!
14.
Well, let’s lookat the 1st part...Resistance (a.k.a. Load).
15.
The resistance (load)is what you are trying to lift or move.
16.
Why do youthink the object you are trying to move is called the “resistance”?
17.
Well...the heavier theobject, the more it “resists” being moved.
18.
What is theresistance or load in this picture?
19.
What is theresistance or load in this picture?
20.
What is theresistance or load in this picture?
21.
What is theresistance or load in this picture?
22.
Now, let’s lookat the 2nd part of a lever...Effort Force (a.k.a. Input Force).
23.
The Effort Force(a.k.a. Input Force) is the effort or work you have to put in, so the object will move. Which letter shows the effort force?
24.
In this useof the lever, what is the effort force (input force)? What is the resistance (load)? See answer on next slide.
25.
This man mustpush down on the board to cause the tire to lift. So, the effort force is the man pushing down...
26.
...and the resistance,or load, is the tire.
27.
Lastly, let’s lookat the 3rd part of a lever...the Fulcrum.
28.
The Fulcrum isa fixed pivot point.
29.
“Fixed” means thefulcrum doesn’t move.
30.
Where is thefulcrum?
31.
Where is thefulcrum?
32.
Where is thefulcrum?
33.
Where is thefulcrum?
34.
Where is thefulcrum?
35.
Where is thefulcrum?
36.
Let’s review theparts of a lever:
37.
1. The workyou have to put in to make the object move is called...
38.
1. The workyou have to put in to make the object move is called...effort force or input force.
39.
2. The objectthat you want to lift or move is called...
40.
2. The objectthat you want to lift or move is called...the resistance or load.
41.
3. The fixedpoint on which the lever pivots is called...
42.
3. The fixedpoint on which the lever pivots is called...the fulcrum.
43.
4. The loadis...
44.
4. The loadis...the object you are trying to lift or move.
45.
5. The otherword for “load” is...
46.
5. The otherword for “load” is...“resistance”.
47.
6. Effort forceis...
48.
6. Effort forceis...the work you put into moving the object.
49.
7. Another termfor effort force is...
50.
7. Another termfor “effort force” is...“input force”.
51.
8. The fulcrumis...
52.
8. The fulcrumis...the fixed point on which the lever pivots.
53.
Good job!
54.
The order ofthe load, effort, and fulcrum determines the lever’s class. There are 3 classes of levers.
55.
A 1st class leverhas the fulcrum somewhere between the effort force and the load.
56.
Go outside todemonstrate 2 levers in action.
57.
The load movesin the opposite direction of the effort force.
58.
So, if youpush down on one end of a lever, the load at the opposite end will move ___ and vice versa.
59.
If you pushdown on one end of a lever, the load at the opposite end will move _up_ and vice versa.
60.
1st Class Lever Question #1:What do you think will happen if the fulcrum is closer to the load than to the effort? Effort Load Fulcrum
61.
1st Class Lever Answer #1: Thereis a gain in force, but there is a loss in speed and distance. Effort Load Fulcrum
62.
1st Class Lever What doesthat mean? Effort Load Fulcrum
63.
Notice that theload doesn’t go as high when the fulcrum is closer to the load. Therefore, there is a loss in distance.
64.
But, if thefulcrum is close to the load, it will be a lot easier to move. Therefore, there is a gain in force. More effort needed Less effort needed
65.
1st Class Lever Question #2:What do you think would happen if the fulcrum is closer to the effort than the load? Effort Load
66.
1st Class Lever Answer #2: Thereis a loss in force, but there is a gain in speed and distance. Effort Load
67.
The load movedhigher when the fulcrum is closer to the effort. Therefore, there is a gain in distance.
68.
But, it ismuch harder to make the load go up when the fulcrum is closer to the effort. Therefore, there is a loss in force. Needs a lot more effort Needs less effort
69.
What are someexamples of 1st class levers?
70.
A seesaw isa 1st class lever. Where is the fulcrum? Effort force? Load?
71.
Pliers are a1st class lever.
72.
Knowing that tomake the effort easier, the fulcrum needs to be closer to the load than the effort, how could a tool manufacturer make it even easier for you to use the pliers?
73.
Answer: A toolmanufacturer could make the handles longer to make it even easier for you.
74.
This is whyyou want to use pruners with really long handles to cut thick branches.
75.
A door handleis a 1st class lever. Where is the force? The load? The fulcrum?
76.
Where is theforce? The load? The fulcrum? Force Fulcrum Load
77.
A bicycle brakelever is a 1st class lever.
78.
Where is theload?
79.
The load iswhere the brake pads squeeze the tire.
80.
A dolly (handtruck) is a 1st class lever.
81.
Which is theforce? The load? The fulcrum?
82.
Which is theforce? The load? The fulcrum? Force Load Fulcrum
83.
A power switchis a 1st class lever.
84.
A railroad trackswitch. fulcrum fulcrum load load effort effort
85.
A hammer pullinga nail is also a 1st class lever. Where is the fulcrum? The effort force? The load?
86.
A hammer pullinga nail is also a 1st class lever. Where is the fulcrum? The effort force? The load? Load Effort Force Fulcrum
87.
A pry baris similar to a hammer and is another 1st class lever.
88.
Scissors are two1st class levers put together. loadload
89.
Okay, now weknow what a 1st class lever is like. What about a 2nd class lever? What is it like?
90.
A 2nd class leverputs the load somewhere between the effort force and the fulcrum.
91.
The fulcrum isat one of the ends of the lever and is usually closer to the load.
92.
What are someexamples of 2nd class levers?
93.
The wheelbarrow isthe most famous 2nd class lever.
94.
The foot isa 2nd class lever.
95.
A stapler isa 2nd class lever.
96.
A bottle openeris a 2nd class lever.
97.
Which arrow pointsto the load? The effort? The fulcrum?
98.
Which arrow pointsto the load? The effort? The fulcrum? fulcrum load effort
99.
A nutcracker usestwo 2nd class levers put together.
100.
Nail clippers usetwo 2nd class levers.

Editor's Notes

#2 image: https://3.bp.blogspot.com/-Z5kjfXP6Fsg/V1Cm8cb67bI/AAAAAAAAACo/g9EqbtneKZA4pueXeEwrEvxvEkXYKno3wCLcB/s1600/1.png
#3 image: https://3.bp.blogspot.com/-Z5kjfXP6Fsg/V1Cm8cb67bI/AAAAAAAAACo/g9EqbtneKZA4pueXeEwrEvxvEkXYKno3wCLcB/s1600/1.png
#4 image: https://3.bp.blogspot.com/-Z5kjfXP6Fsg/V1Cm8cb67bI/AAAAAAAAACo/g9EqbtneKZA4pueXeEwrEvxvEkXYKno3wCLcB/s1600/1.png
#10 image: http://www.cool-science-projects.com/images/man-and-lever.jpg
#11 image: http://www.cool-science-projects.com/images/man-and-lever.jpg
#12 image: http://www.ruoff.com/blog/wp-content/uploads/2012/04/teeter-totter.jpg
#14 image: http://www.ideachampions.com/weblogs/Confused.jpg
#15 image: http://www.sciencekids.co.nz/images/pictures/coloringpages/dictionarylookup.jpg
#16 image: http://eschooltoday.com/science/simple-machines/images/parts-of-a-lever.jpg
#17 image: https://www.eres-group.com/wp-content/uploads/2016/02/question.png
#18 image: https://bigseadesign.com/wp-content/uploads/2012/09/horse.jpe
#19 image: https://i.ytimg.com/vi/R1pMrDfv8SY/maxresdefault.jpg Answer: Dirt
#20 image: http://www.bounceenergy.com/blog/wp-content/uploads/2012/04/iStock_000005227652Small.jpg Answer: Boxes
#21 image: https://drinks-dvq6ncf.netdna-ssl.com/wordpress/wp-content/uploads/2012/09/images.jpeg Answer: The bolt
#22 image: http://g02.a.alicdn.com/kf/HTB1GQ4hIVXXXXXRXpXXq6xXFXXXV/-Quick-high-quality-Walnut-Cracker-Zinc-Alloy-Nutcracker-Sheller-Nut-Opener-easy-to-use-Kitchen.jpg Answer: The walnut
#23 image: http://www.sciencekids.co.nz/images/pictures/coloringpages/dictionarylookup.jpg
#24 Answer: A
#25 image: http://www.scienceclarified.com/images/uesc_06_img0346.jpg
#26 image: http://www.scienceclarified.com/images/uesc_06_img0346.jpg
#27 image: http://www.scienceclarified.com/images/uesc_06_img0346.jpg
#28 image: http://www.sciencekids.co.nz/images/pictures/coloringpages/dictionarylookup.jpg
#29 image: http://educationwithfun.com/pluginfile.php/1193/mod_page/intro/lever.PNG
#30 image: http://educationwithfun.com/pluginfile.php/1193/mod_page/intro/lever.PNG
#31 image: https://images-na.ssl-images-amazon.com/images/I/51OBlZTOCML.jpg
#32 image: https://images-na.ssl-images-amazon.com/images/I/51OBlZTOCML.jpg
#33 image: http://g02.a.alicdn.com/kf/HTB1GQ4hIVXXXXXRXpXXq6xXFXXXV/-Quick-high-quality-Walnut-Cracker-Zinc-Alloy-Nutcracker-Sheller-Nut-Opener-easy-to-use-Kitchen.jpg
#34 image: http://g02.a.alicdn.com/kf/HTB1GQ4hIVXXXXXRXpXXq6xXFXXXV/-Quick-high-quality-Walnut-Cracker-Zinc-Alloy-Nutcracker-Sheller-Nut-Opener-easy-to-use-Kitchen.jpg
#35 image: https://i.ytimg.com/vi/rpE8FtEUmWE/hqdefault.jpg
#36 image: https://i.ytimg.com/vi/rpE8FtEUmWE/hqdefault.jpg
#54 image: http://www.dotatalk.com/wp-content/uploads/2013/11/Thumbs_Up.png
#55 image: https://skimoves.files.wordpress.com/2014/11/lever-classes.jpg
#56 image: https://www.thinglink.com/scene/492557566350458881
#58 image: https://www.thinglink.com/scene/492557566350458881
#70 image: http://www.gunholstersunlimited.com/blog/wp-content/uploads/2014/08/Which-Bi-Pod-do-I-Need.jpg
#71 image: https://www.cedarworks.com/dist_prod/imagesnonresponsive/assets/assets_prod/images-minified/nonresponsive/product-detail-huge/backyard_seesaw.jpg
#72 image: http://www.school-for-champions.com/machines/images/levers_classes_1_pliers.gif
#73 image: http://www.school-for-champions.com/machines/images/levers_classes_1_pliers.gif
#74 image: http://www.school-for-champions.com/machines/images/levers_classes_1_pliers.gif
#75 image: https://www.wonkeedonkeetools.co.uk/media/wysiwyg/19L-Loppers-Emily/19L05/19L-5-20_TBTW.jpg image: http://img-aws.ehowcdn.com/350x235p/photos.demandstudios.com/getty/article/83/192/78023195_XS.jpg image: http://www.bettergardentools.com/images/bgt200p1.jpg
#76 image: https://s-media-cache-ak0.pinimg.com/originals/ef/0d/98/ef0d98506a6b8df78463ad0eacb0cef8.jpg
#77 image: https://s-media-cache-ak0.pinimg.com/originals/ef/0d/98/ef0d98506a6b8df78463ad0eacb0cef8.jpg
#78 image: http://www.bikebuyers.com/images/verona_sport_7sp_black_lever.JPG
#79 image: http://www.technologystudent.com/forcmom/lever2a.gif
#80 image: http://pad3.whstatic.com/images/thumb/8/80/Fix-Stuck-Bicycle-Brakes-Step-2-Version-5.jpg/aid30117-v4-728px-Fix-Stuck-Bicycle-Brakes-Step-2-Version-5.jpg
#81 image: http://www.negarentals.com/itemimages/410.jpg
#82 image: http://www.technologystudent.com/forcmom/lever3a.gif
#83 image: http://www.technologystudent.com/forcmom/lever3a.gif
#84 image: https://vignette2.wikia.nocookie.net/spongebob/images/9/97/Man_Ray_Pulls_Lever.png/revision/latest?cb=20130718174325
#85 image: https://thumbs.dreamstime.com/t/old-hand-operated-railroad-switch-lever-netherlands-88282891.jpg
#86 image: http://pop.h-cdn.co/assets/15/22/480x650/h-pulling-nails.jpg
#87 image: http://pop.h-cdn.co/assets/15/22/480x650/h-pulling-nails.jpg
#88 image: http://ehowdiy.com/images/how_to_remove_plaster_wallsImage471-6.jpg image: http://pop.h-cdn.co/assets/cm/15/05/54c89745e7540_-_floor-remove-2-1207-98719332.jpg
#89 image: http://media.web.britannica.com/eb-media/39/63039-004-EA390608.gif
#90 image: http://www.fairsalvage.com/wp-content/uploads/2015/10/Ask-a-Question.jpg
#91 image: http://www.aaronswansonpt.com/wp-content/uploads/2011/06/2nd-Class-Lever-Swanson-e1432429073359.jpg
#92 image: http://www.aaronswansonpt.com/wp-content/uploads/2011/06/2nd-Class-Lever-Swanson-e1432429073359.jpg
#93 image: http://www.gunholstersunlimited.com/blog/wp-content/uploads/2014/08/Which-Bi-Pod-do-I-Need.jpg
#94 image: http://www.school-for-champions.com/machines/images/levers_wheelbarrow.jpg
#95 image: http://3.bp.blogspot.com/-_wW7QAGmgw4/UGspmLZPZxI/AAAAAAAAADo/C13OGHm9yXM/s1600/2_class.gif;
#96 image: http://www.school-for-champions.com/machines/images/levers_classes_stapler.jpg
#97 image: http://www.craftsmanspace.com/sites/default/files/free-plans-articles/Bottle_opener_1.jpg
#98 image: http://www.craftsmanspace.com/sites/default/files/free-plans-articles/Bottle_opener_1.jpg
#99 image: http://www.craftsmanspace.com/sites/default/files/free-plans-articles/Bottle_opener_1.jpg
#100 image: http://aciy.weebly.com/uploads/2/9/5/3/29530319/611173.png?461
#101 image: http://www.wonkeedonkeetools.co.uk/media/wysiwyg/19MST-Manual-Swaging-Tools-Emily/19MST08/19MST-8-15.jpg
#102 image: http://ecx.images-amazon.com/images/I/616y%2BCoNnyL._SL1500_.jpg
#103 image: http://ecx.images-amazon.com/images/I/616y%2BCoNnyL._SL1500_.jpg
#104 image: http://ecx.images-amazon.com/images/I/616y%2BCoNnyL._SL1500_.jpg
#105 image: http://www.fairsalvage.com/wp-content/uploads/2015/10/Ask-a-Question.jpg
#108 image: https://www.nickoneill.com/assets/images/aha.jpg
#109 image: https://media4.giphy.com/media/inyqrgp9o3NUA/200_s.gif
#110 image: http://www.aaronswansonpt.com/wp-content/uploads/2011/06/3rd-Class-Lever-Swanson-e1432429104716.jpg
#111 image: http://www.gunholstersunlimited.com/blog/wp-content/uploads/2014/08/Which-Bi-Pod-do-I-Need.jpg
#112 image: https://s-media-cache-ak0.pinimg.com/originals/b0/ff/3f/b0ff3f76ea0ac9422acede83c268721b.jpg
#113 image: https://upload.wikimedia.org/wikipedia/commons/b/b0/Hammer-lever_diagram.jpg
#114 image: https://image.slidesharecdn.com/levers2-150317160359-conversion-gate01/95/levers-12-638.jpg?cb=1426608291
#115 image: https://cdn-enterprise.discourse.org/tnation/uploads/default/original/3X/3/2/32185d6260dc2dd7f04ffee6c0c4a4c2eae7b728.jpg
#116 image: https://cdn.goconqr.com/uploads/flash_card/image_question/7630954/desktop_4fbccf53-be41-4e82-bb35-c7f811fae8c6.jpg
#117 image: http://www.happyfolding.com/files/tweezers.png
#118 image: http://www.happyfolding.com/files/tweezers.png
#119 image: http://reetsdryingacademy.com/wp-content/uploads/2014/11/test-your-knowledge-small.jpg
#120 image: https://mobileimages.lowes.com/product/converted/755625/755625008961.jpg
#121 image: http://rpgaspiping.com/blog/wp-content/uploads/2014/06/38024-hi-shovel.jpg
#122 image: http://www.tpub.com/machines/1.htm3.gif
#123 image: http://www.tpub.com/machines/1.htm3.gif
#124 image: https://www.jbprince.com/images/U900_zoom.jpg
#125 image: https://www.jbprince.com/images/U900_zoom.jpg
#126 image: https://media.qcsupply.com/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/3/4/340640_1__1.jpg
#127 image: https://media.qcsupply.com/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/3/4/340640_1__1.jpg
#128 image: https://lifescitpjhs.wikispaces.com/file/view/gBottleOpener.PNG/333794070/543x411/gBottleOpener.PNG
#129 image: https://lifescitpjhs.wikispaces.com/file/view/gBottleOpener.PNG/333794070/543x411/gBottleOpener.PNG
#130 image: http://wiki.dtonline.org/images/thumb/2/21/WheelbarrowLabelled.png/300px-WheelbarrowLabelled.png
#131 image: http://wiki.dtonline.org/images/thumb/2/21/WheelbarrowLabelled.png/300px-WheelbarrowLabelled.png
#132 http://starecat.com/content/wp-content/uploads/no-wait-im-not-ready-dog-hit-by-a-frisbee.jpg
#133 image: https://duellingdialysis.files.wordpress.com/2011/03/homer_woohoo.jpg
#137 info: http://www.sheknows.com/living/articles/1028977/how-do-levers-work
#143 image: http://images.clipartpanda.com/sad-girl-stick-figure-image.png
#148 https://youtu.be/E5pZ7uR6v8c

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