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Message: <blockquote data-quote="Cari" data-source="post: 3134751" data-attributes="member: 138216">Heh, good point.Lets suppose that the immovable object is sitting on the ground, and the coefficient of friction between the ground and the object is non-zero.  And lets also assume that the thing producing the unstoppable force is also attached to the ground.  This way, the net force on the ground will be zero unless the object begins to accellerate (so we can't accellerate the object by accellerating the ground).We could, by adjusting mass or the coefficient of friction, make the object immoveable for any finite force.</blockquote>