coefficient of sliding friction

for: an object sliding over a solid surface

is denoted: by [P2.3]

is: the ratio of the magnitude of the sliding frictional force on the object to the magnitude of the reaction force on the object. [P2.3]

depends: on the surfaces involved and their state of lubrication. [P2.3]

is largely independent: of other factors, including the area of contact and the speed of the object. [P2.3]

usually is: smaller than the coefficient of static friction [P2.3]