what is easier - to move the box from rest or to move it when it is already in motion? why?
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it is easier to move a box already in motion rather than a box at rest, because on a box at rest, static friction is at work which has a higher value than kinetic friction, the friction that acts in moving bodies
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When the box starts sliding, the contact points on its surfaces, do not get enough time to lock, into the contact points on the floor. So, the sliding friction is slightly less than static friction.
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