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ANATOMY OF THELEVER

Lever A bar that is free to move about axed point

Parts of a lever

Fulcrum The xed point of a lever

Eort Arm The part of the lever that theeort force is applied to (measured from

the fulcrum to the point at which the forceis applied

!esistance Arm The part of the lever thatapplies the resistance force (measured

from the fulcrum to the center of the

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ANATOMY OF THELEVER

Levers may be straight or curved

Forces applied on the lever parallel or inclined

Effort arm load arm

Large load- small effort i.e. l2should be effort arm and it should

be greater than l1.

Large effort arm may not be possible due to space limitations.

For greater leverage compound levers (straight pieces with

pins

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APPLICATION OF LEVERS IN ENGINEERINGPRACTICE

Three Classes of LeversFirst Class - fulru!

"et#ee$ I$%ut a$& out%ut

Seo$& Class ' out%ut"et#ee$ fulru! a$&

i$%ut Thir& Class ' i$%ut

"et#ee$ fulru! a$&

out%ut