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The Law of the Screw

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-117

2025-12-30

931

The mechanical advantage of a screw cannot be determined unless we know at what point the power is applied. From the general law of machines, the formula can be written

  P× 2 πR = Wp,

 or  P: W = p: 2 πR, 

in which p is the pitch of the screw, and R is the radius of the circle through which the power moves.