. Human physiology. Fig. 60.—Illustrating the Lever (First Order). w, a weight suspended at one end ; f, the fulcrum; p, the point at which thepower is applied. but this pulling force may be resisted by suspending a weight atthe end of the lever. Thus we have two forces acting on thebar—one applied at the point P, and the other, the downwardtendency of the weight suspended, acting at the point W. Levers are classified under three orders according to therelative positions of the fulcrum, the point at which a power isapplied, and the point at which this power is counteracted by a. Fig. 61
. Human physiology. Fig. 60.—Illustrating the Lever (First Order). w, a weight suspended at one end ; f, the fulcrum; p, the point at which thepower is applied. but this pulling force may be resisted by suspending a weight atthe end of the lever. Thus we have two forces acting on thebar—one applied at the point P, and the other, the downwardtendency of the weight suspended, acting at the point W. Levers are classified under three orders according to therelative positions of the fulcrum, the point at which a power isapplied, and the point at which this power is counteracted by a. Fig. 61.—A Crowbar, used as a Lever of the First Order. weight or any resisting body. The three orders are known as thefirst, second, and third. Levers of the first order are those in which the fulcrum isbetween the power and the weight. The following are a fewfamiliar examples :— THE LEVERS OF THE BODY 55 (i) The crowbar, when used to lift a weight at one end bythe application of power at the other. In this case a block of woodusually forms the fulcrum. (Fig. 61.) ©
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