lbs. each attached to theends, and place it overthe pulley. The twoweights balance eachother. Move one, calledthe power, dow^nward,wdiile the other, theweight, will go upward,both moving the samedistance. In this caseP -.W .:Wd :Pd. Experiment 21. —Suspend a fixed ^^ulleyA and a light movable… … Fig. IV. — A Lever of the Second Class. P Fig. 18.—a Lever of the Third Class,
Physics
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