Download The three classes of levers

Crowbar for
removing
nails
Seesaw
pliers
human upper arm
scissors
wheelbarrow
spade
nutcracker
baseball bat
The three classes of levers
There are three classes of levers depending on the location of the
fulcrum, the
effort force and
load or resistance force.
First-class levers
Effort
Force
Load
A First-Class Lever is a lever in which the fulcrum is located in between the Effort Force and the
Resistance Force or Load.
Examples:
1.
2.
3.
4.
Seesaw (also known as a teeter-totter)
Crowbar (removing nails)
Pliers
Scissors
Load
Second-class levers
Examples:
1. Wheelbarrow
2. Nutcracker
3. door
Effort
Force
Load
Third-class levers
Examples:
1.
2.
3.
4.
5.
6.
7.
8.
Effort
Force
Human arm
Tongs
Catapult
fishing rod
Many garden tools, such as a hoe
A baseball bat
A shovel
A broom
A mnemonic for remembering the three classes of levers is the word
where the letters
fle-x,
f-l-e represent the fulcrum, the load, and the effort as being
between the other two, in the first-class lever,
the second-class lever,
F
L
and the third-class lever. E
In our models, the fulcrum was the orange triangle,
the effort force is the green arrow and
the load or resistance force is the gray box.