Friction is the force resisting the relative
motion of solid surfaces, fluid layers, and material elements sliding
against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
This is a comprehensive resource with several working examples on Friction, and Approximate Values of Coefficient of Static Friction for Dry Surfaces like Metal on metal 0.15-0.60, Metal on wood 0.20-0.60, Metal on stone 0.30-0.70, Metal on leather 0.30-0.60, Wood on wood 0.25-.050 etc
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