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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?
Seema has to apply more force to push the heavier box on the same floor.
Because moving a heavy box is difficult compared to moving a lighter box. The heavier box exerts more pressure on the contacting surface, which enhances the strongness of interlocking irregularities that increase the frictional force. Hence, the force of friction increased with an increase in pressure.
Therefore, the frictional force for a heavy object is more than the lighter object. So, the force required to move a heavier box will also be larger.
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