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Coefficient of Friction(µ) #8211; It is defined as the ratio of the force of limiting friction (f<sub>s</sub>) to the normal reaction ® between them. i.e. µ = f<sub>s</sub>/R So, value of µ depends on: (a) Nature of the surface in contact, i.e. dry or wet, rough or smooth, (b) material of the surface in contact.
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