Question

if you push a heavy box which is at 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

Answer 1

Heavy box which is at rest posses Static friction.

And sliding box posses sliding friction.

We know that Static friction is always more than the 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.

Answer 2

Answer:

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