Upon what variables is the magnitude of friction dependent?
What will be an ideal response?
ANS: The magnitude of friction is dependent upon (1) the magnitude of contact between the two surfaces
on which the friction is occurringâ€"increased contact increases the maximum value of static
friction or the absolute value of kinetic friction; (2) the nature of the contacting surfacesâ€"the
rougher one or both of the surfaces (increased coefficient of static or kinetic friction), the greater is
the maximum value of static friction or the absolute value of kinetic friction; and (3) the shear
force(s) on the objectsâ€"friction has magnitude only when there is attempted motion (static
friction) or actual motion (kinetic friction) between the two surfacesâ€"the magnitude of friction on
a static object will always equal the net shear force on that object; the magnitude of friction on a
moving object is always the product of the contact force and the coefficient of kinetic friction.
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