Why always friction opposes a moving o object
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I have always treated
friction as 'opposing' force rather than motion, either at its limit or
to maintain equilibrium. I have just realised, however, that if an
object is at rest on an inclined plane, but is not at limiting
equilibrium and you give it a nudge it will accelerate while you apply
the force on to it but then (usually) decellerate to rest. If friction
opposes force you would expect the object to maintain a constant
velocity once it is moving, so there must be friction greater than the
weight parallel to the plane.
Does this mean that friction opposes motion rather than force .
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