Question

0 If you push a beavy 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

Answer:

In order to move the heavy box, you need to overcome the friction force that acts against the force that you are exerting on the box when you push it.

The friction can be either static or kinetic friction. The static friction is the friction force that you have to overcome to start the motion of the box, while the kinetic friction force is the force that you have to overcome when the box is moving to keep it moving at constant speed.

The static friction is bigger than the kinetic friction. Therefore, you need more force to apply to get the box to start moving than to keep it moving afterwards.

Answer 2

Answer:

because at that time frictional force is present now when you apply a lesser force , it is greater than frictional force