What is the Principle of the Lever in Physics

Principle of the Lever

 

In the lever the moment P acts opposite to that of work W. It means that force F tends to rotate the lever in one direction which the weight W rotates in opposite direction. If the magnitude of these moments acting in opposite direction is equal, then the lever will be in equilibrium. It means that:

 

Moment of P = Moment of W

 

Mechanical Advantage:

 

We know that according to Principle of Lever:

 

Moment of P = Moment of W

 

Force * Force Arm = Weight * Weight Arm

 

P * AB = WX BC

 

AB/BC = W/P

 

Hence,

MA = W/P = AB/BC = Weight Arm/ Force Arm

 

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