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The Movable Pulley

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p- 105

2025-11-06

540

in which the axis of the pulley can move with it, is a modified lever, but it is of the second class, the fulcrum being at B (Fig. 1), the weight (including the weight of the pulley) being applied at C with a lever arm CB= r, and the power at A with a lever arm AB= D. The formula for the single movable pulley is P: W = r: D, and since D is the diameter and r is the radius of the pulley, this becomes

P: W = 1:2,

P=1/2W.

FIG. 1