Qualitatively, their difference lies in the contrariety of their direction; The becoming of essence quantitatively, granted that the two are unequally determined, in that as one increases, the other is supposed to decrease, and vice versa; and also, in that the relation between the two is suddenly reversed again, for after the centripetal force has been increasing for a length of time and the centrifugal force has decreased accordingly, a point is reached at which the centripetal force decreases and the centrifugal increases.