What is the principle of a lever? Write an expression for its mechanical advantage.

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Solution

Part 1
The lever works on the principle that the turning effect produced by the effort at the fulcrum must be equal to the turning effect produced by the load at the same point that is the fulcrum.
It is given as $E f f o r t \times E f f o r t a r m = L o a d \times L o a d a r m$
Part 2
The mechanical advantage of the lever is defined as the ratio of load to the effort
It is given as $M A = \frac{L o a d}{E f f o r t}$
In terms of the effort arm and load arm, it can be expressed as $M A = \frac{E f f o r t a r m}{L o a d a r m}$

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