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 .
Darcy Lever several ways, whilst the spellings differ the pronunciation was similar to 'lever' – Lethre 1221; Leuere 1278; Leuir 1282; Leuer 1291 and Leyver 1550. Initially, Lever was the name for the hamlets comprising the manor of Lever. In 1509 it became Darcye Lever, the distinguishing affix coming from possession by the D'Arcy family. "NOTE : Until 1509 the area called Darcy Lever today was part of the Manor of Little Lever. In the text, where the name is given in italicised text with square brackets, it refers to the area of Darcy Lever before it gained that name." Darcy Lever