Question

what is the principal of a lever
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Answer 1

Principle of the Lever. It has been found by experiment that two equal forces acting in opposite directions, i.e., clockwise and counterclockwise, and applied to a uniform lever at equal distances from the fulcrum counteract each other and establish a state of equilibrium, or balance, in the lever.

And Archimedes was the first to discover this principle in the third century BC. and illustrates it with his famous phrase "Give me a fulcrum and I will move the world" (Archimedes quoted by Pappus - fourth century). Move the man, the mass and/or the fulcrum.

Answer 2

Answer:

it has found by exprement that two equal forces acting in opposite directions,i,e, clockwish and counterclockwise and applied to unfrom lever at equal distancea from the fulcrum counteract each other and establish a state of equilibrium.