Ifyou push a heavy box which is rest, you must exert some force to start its motion.
However once the box is sliding you apply a lesser force to maintain that motion.
Why? (AS,)
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Heavy box which is at rest posses Static friction. And sliding box posses sliding friction. ... Static friction>sliding friction>rolling friction. Therefore in order to move a bo at rest we have to overcome static friction and we have ro apply more force.
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