Lever resistance (or load). It is common to call the input force "the effort" and the output force "the load" or "the resistance." This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: These cases are described by the mnemonic "fre 123" where the fulcrum is in the middle for the 1st class lever, the "r"esistance is in the middle for the 2nd class lever, and the effort is in the middle for the 3rd class lever. The lever is a movable bar that pivots on a fulcrum attached to
Lever Brothers the Kennedy Space Center and Johnson Space Center. Lever Brothers Lever Brothers was a British manufacturing company founded in 1885 by brothers William Hesketh Lever (1851–1925) and James Darcy Lever (1854–1916). They invested in and successfully promoted a new soap-making process invented by chemist William Hough Watson. In 1930, Lever Brothers merged with Margarine Unie to form Unilever. Starting with a small grocery business begun by his father, William Lever and his brother James entered the soap business in 1885 by buying a small soap works in Warrington. The brothers teamed up with a Bolton chemist, William Hough Watson, who