. The Ontario high school physics. B -Lever of the first class. about 0, the fulcrum. By applying a force i^at J. a force TTisexerted at B against a heavy body, which it is desired to raise. AO, BO are called the arms of the lever. Then by the principle of moments, the moment of the forceF about 0 is equal to the moment of the force W about 0,that is, F X AO = W X BO, W AO F=m Force obtained y (• i p or -; —-— = inverse ratio ot lengths or arms. l^orce applied This is called the Law of the Lever, and the ratio WjF is called the mechanical advantage. (57 68 MACHINES rpi W AO F BO Suppos
. The Ontario high school physics. B -Lever of the first class. about 0, the fulcrum. By applying a force i^at J. a force TTisexerted at B against a heavy body, which it is desired to raise. AO, BO are called the arms of the lever. Then by the principle of moments, the moment of the forceF about 0 is equal to the moment of the force W about 0,that is, F X AO = W X BO, W AO F=m Force obtained y (• i p or -; —-— = inverse ratio ot lengths or arms. l^orce applied This is called the Law of the Lever, and the ratio WjF is called the mechanical advantage. (57 68 MACHINES rpi W AO F BO Suppose, for instance, AO = 3G inches, BO — 4 ~ — 9, the mechanical There are many examples of levers of the first class. Among them are, the common balance, a pump handle, a pair of scissors (Fig. 66), a claw-hammer (Fig 67)..
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