Lever the power out, and the ratio of output to input force is given by the ratio of the distances from the fulcrum to the points of application of these forces. This is known as the "law of the lever." The mechanical advantage of a lever can be determined by considering the balance of moments or torque, "T", about the fulcrum. where F is the input force to the lever and F is the output force. The distances "a" and "b" are the perpendicular distances between the forces and the fulcrum. Since the moments of torque must be balanced, formula_3 .
Lever of the lever. The word "lever" entered English about 1300 from Old French, in which the word was "levier". This sprang from the stem of the verb "lever", meaning "to raise". The verb, in turn, goes back to the Latin "levare", itself from the adjective "levis", meaning "light" (as in "not heavy"). The word's primary origin is the Proto-Indo-European (PIE) stem "legwh-", meaning "light", "easy" or "nimble", among other things. The PIE stem also gave rise to the English word "light". The earliest remaining writings regarding levers date from the 3rd century BCE and were provided by Archimedes. 'Give me