Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 63
e fulcrum theweight-arm. 54, Law for First Class.—In order that P and W may-just balance each other we must have, as can be seen fromExercise 8, power X power-arm = weight X weight-arm. Tins is the law for a lever of the first class. 55. Levers of the Second and Third Classes.—But we may have a… … Fig. 29. Fig. 30. There is still a different case, shown in Fig. 30, wherethe line of action of the power lies between the fulcrumand the line of action of the weight. This is called a leverof the third class. In the second and third classes of levers, as in the firstclass, the shortest distance…
Physics
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