Question

Iqbal has to push a lighter box and Sima has to push a similar heavier box on the same floor who will have to apply a large force and why

Answer 1

F= ma
sima has to apply large force, because
heavier box has large mass

Answer 2

Answer:

Due to the interlocking of the irregularities on the two surfaces in contact, the force of friction arises. On the floor when a heavy object is placed, the interlocking of irregularities on the surface of the box and floor become strong. This is because the two surfaces in contact are pressed harder. Hence, more force is required to overcome the interlocking. Thus, to push the heavier box, Seema has to apply greater force than Iqbal.