Why frictional force is independent of area of contact

1.	Why frictional force is independent of area of contact
Answer» {tex}\\begin{array} { l } { F _ { \\mathrm { f-static } } \\leq \\mu _ { s } N } \\\\ { F _ { \\mathrm { f-kinetic } } = \\mu _ { k } N } \\end{array}{/tex}Notice that both of these friction formulas ONLY depend on the coefficient of friction and the normal force. It does not depend the area of contact, it doesn\'t depend on the sliding speed.

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