speculate in terms of the microscopic surface irregularities as to why uk (Coeff

Question

speculate in terms of the microscopic surface irregularities as to why uk (Coefficient of kinectic friction) is less than us (coefficient of static friction) and what effect lubricant has on the coefficient of friction speculate in terms of the microscopic surface irregularities as to why uk (Coefficient of kinectic friction) is less than us (coefficient of static friction) and what effect lubricant has on the coefficient of friction speculate in terms of the microscopic surface irregularities as to why uk (Coefficient of kinectic friction) is less than us (coefficient of static friction) and what effect lubricant has on the coefficient of friction

Explanation / Answer

Ff = µ*Fn. That's how a direct proportion is defined.
a)

Looking at the eq. The slope of the graph IS µ.
µk involves the peaks of the surface irregularities being sheared off as the surfaces slide by each other. µs involves the peaks and valleys interlocking to create a greater required shear force to initiate movement.  that's why uk (Coefficient of kinectic friction) is less than us (coefficient of static friction)

b) lubrication bring shear force down which bring friction coefficient lower

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