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Why do we need to apply more force to mo...

Why do we need to apply more force to move a box from a rough surface than a smooth surface?

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Friction is caused by the irregularities on the two surfaces in contact. On rough surfaces there are larger number of irregularities. So, the force of friction is greater on a rough surface as compared to a smooth surface. So, more force should be applied to overcome friction between box and rough surface in order to move the box.
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