Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 245
Figure 244.—The Lever. 234 MACHINES … Figure 245. —■ First Class Lever. The law of the lever is that the force moment equals theweight moment, or F a = W b. 278. Classes of Levers. — Levers are divided into threeclasses, according to the relative positions of the force, the weight, and the pivot.The first class hasthe weight and…
Physics
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