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Next to the wedge, the lever is the simplest tool used by mankind. In its basic form, a single lever is stiff straight rod that rests on a pivot point called a fulcrum.

The length of the rod is L, its length from one end of the rod to the pivot point is l; so the length from the pivot point to the opposite end is L - l.

We can show that F = f (l/(L - l)) increases the input force f to F > f when (l/(L - l)) > 1.0. The ratio (l/(L - l)) is called the mechanical advantage of the lever. EX: If L = 10 and l = 9, then 9/(10 - 9) = 9 is the mechanical advantage. So that F = 9f would be the result.

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Duane Anymouse

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4y ago

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