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What are the factors affecting friction?
Roughness/smoothness of the sliding object.
Roughness/smoothness of the surface.
Shape/design of the object.
Normal force acting upon the sliding bodies.
Dry friction is independent of the surface area of a contact.
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The frictional force between two bodies depends mainly on three factors: (I) the adhesion between body surfaces (ii) roughness of the surface (iii) deformation of bodies.
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