Friction

Concept Card: Friction in Mechanics – Static, Kinetic & Rolling Friction 1. Physical Origin and Nature of Frictional Forces: Friction is an electromagnetic contact interaction arising from microscopic surface irregularities (asperities) and cold-welding (intermolecular bonding) at real microscopic points of contact. – Real contact area ($A_{\text{real}}$) is a minute fraction of the macroscopic apparent area … Read more