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Friction

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-111

2025-11-08

332

Whenever any body is put in motion by sliding or rolling it over another, and the body is then left to itself, its velocity will gradually diminish, and it will come to rest. This is due to friction, which is the resistance that is encountered in moving (or trying to move) one body over another under pressure. Friction arises from inequalities in the surfaces in contact. If any means is taken to reduce these inequalities, either by making the surfaces smoother, or by filling up the depressions with some form of lubricating material, the friction is diminished.