LEVER

A device used to moved or lift road with smaller force than load
In the working system ,a lever consist of :
Load
Support
Power
Power arm
Load arm
Based on position of power , load , and support point , the lever is divided into 3 kinds : first kind lever , second kind lever , and third kind lever

FIRST KIND LEVER
The position support point lies between load and power.
In other words , load and power lie at different sides from support point.
Example : crowbar , cutter forceps
SECOND KIND LEVER

The position of support point lies at one edge of the lever , the located between support point and power.
Example : Bottle plug opener , nail drawer , and so on.


THIRD KIND LEVER


Position of support point lies at one edge while power is located between support point and load.