Question

Define Perfect machine? Write principle of lever.

Answer 1

Answer:

Explanation:

it refers to  a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, wear, or other inefficiencies.

It has been found by experiment that two equal forces acting in opposite directions  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.

Answer 2

Answer:

The term ideal machine refers to a hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation, wear, or other inefficiencies. ... In this case, the mechanical efficiency is 100%.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. ...