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Coefficient of Friction

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-111

2025-11-08

292

The coefficient, or measure, of sliding friction -either of rest or of motion -is expressed by the equation   f=P/W  ,in which P is the force necessary to overcome the friction, and W is the pressure normal (perpendicular) to the surfaces in 'contact. A simple method of determining this, for friction of rest, is to place a block of known weight, W, upon a level board, and set it in motion by putting weights in a scale pan suspended as in Fig. 1. In measuring friction of. motion care must be taken that the speed is uniform.