Friction
Friction is the force that opposes one object sliding over another. Various factors effect the friction between two surfaces including:
- the type of materials in contact
- the amount of pressure being applied that forces them together
- the texture of the surfaces in contact
- the area of the surfaces in contact
- whether lubricated or dry.
Coefficient of Friction
The amount of resistance to sliding of one object over another is called the coefficient of friction. A high resistance to sliding results in a high coefficient of friction.
Friction force may be expressed as:
Ff = µ N
where
Ff = friction force (N, lb)
µ = static (µs) or kinetic (µk) frictional coefficient.
N = normal force
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