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Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
It is easier to push a light box because the force applied on the floor is less, hence the friction is less
On the other hand, it is difficult to push a heavy box because the force applied on the floor is larger,hence friction is much more.
Thus, Seema will have to apply a larger force than Iqbal to push the box