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Three types of lever
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A lever is any kind of rigid bar that sits on a pivot point or fulcrum and rotates about that point. It may be used to move a heavy object with a force that is smaller than the weight of the object.
A lever has three parts 1. fulcrum or pivot point2. load3. effort (the force)
LEVERS
fulcrum or pivot pointload
effort
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THREE TYPES OF LEVER
1.First order of lever
2. Second order of lever
3.Third order of lever
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FIRST ORDER OF LEVERS
In this type of lever, the fulcrum is in the middle between the load and the effort.
load effort
fulcrum
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FIRST ORDER OF LEVERS
loadeffortfulcrum
In this type of lever, the fulcrum is in the middle between the load and the effort.
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FIRST ORDER OF LEVERS
effort
load fulcru
m
The lever will balance if the load and effort are equal, and same distance from the fulcrum.
Then the system is in equilibrium.
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FIRST ORDER OF LEVERS
effort
load fulcrum
If load is greater than the effort Then the system is not in equilibrium
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FIRST ORDER OF LEVERS
effort
load
fulcrum
If effort is greater than the load Then the system is not in equilibrium
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FIRST ORDER OF LEVERS
effort
loadfulcrum
A seesaw is an example of a first class lever
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FIRST ORDER OF LEVERSEXAMPLES
fulcrum
load
effort
scissors
fulcrum
load effo
rt
weigh scales crowbar
effort
Load
fulcrum
a claw hammer
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FIRST ORDER OF LEVERSEXAMPLES
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SECOND ORDER OF LEVERS
In this type of lever, The load is between the effort and the fulcrum .
loadeffort fulcrum
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SECOND ORDER OF LEVERS
In this type of lever, The load is between the effort and the fulcrum. The fulcrum is at one end of the lever.
load
effort
fulcrum
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SECOND ORDER OF LEVERSEXAMPLES
fulcrum
load
effort
wheelbarrow
effort
fulcrum
nutcracker
load
load
fulcrum
effort
fulcrum
load
effort
a person stands on tip-toe
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SECOND ORDER OF LEVERSEXAMPLES
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THIRD ORDER OF LEVERS
In this type of lever ,the effort between the fulcrum and the load.
loadeffortfulcrum
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THIRD ORDER OF LEVERS
load
effort
fulcrum
In this type of lever ,the effort between the fulcrum and the load.
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THIRD ORDER OF LEVERSEXAMPLES
load
effort
fulcrum
load
fulcrum
effort
Fishing rod
The effort is applied somewhere in between by a muscle attached above the fulcrum, on the upper arm.
Shovelfulcrum
load
effort
TWEEZERS
load
effort
fulcrum
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THIRD ORDER OF LEVERS THIRD ORDER OF LEVERSEXAMPLES