Why is it that, as soon as the 'required' static friction for no relative motion between two objects exceeds the maximum static friction, kinetic friction 'takes over'? Shouldn't static friction continue acting at it's maximum value, in addition to the kinetic friction?
Essentially, if there is no relative motion between two objects, we have static friction trying to to maintain that state, but if there is relative motion, then static friction just completely 'gives up'. Why is this?
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