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A lever is a simple machine with a rigid bar which can rotate about a fixed point or on a fixed line. For example; seesaw, scissors etc.
Principle of Lever
Load × Load arm = Effort × Effort arm.
If we rearrange the above equation, we obtain
Therefore, the mechanical advantage of a lever is nothing but the ratio of the length of its effort arm to the load arm.*Please post other questions in separate threads.