4.2. Friction
4.2.1. Basic concepts of friction
4.2.1.1. Coefficient of friction
Friction is frequently defined by a parameter called the coefficient of friction COF, μ. This parameter is a dimensionless quantitative value determined by dividing the tangential friction force (F) by the normal load force (W). The coefficient is called either static or dynamic coefficient of friction, depending on the friction case. This coefficient is an empirical parameter that has to be determined by experimental tests and cannot be predicted through theoretical modeling or calculations.
The main factors contributing to friction coefficient are the topography of surfaces in contact, surface area, normal pressure, sliding velocity, and the time during ...
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