Question

Two men tried to push a heavy box and could not suceed. Finally, wheels were fitted to the box and now a single man can move it. Justify

Answer 1

Hi friend here is your answer.

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We know when we apply force on box which is on a sureface , the surface also apply a force which is frictional force.

And as the two men are pushing the box , the box is not moving because in this case frictional force is greater than applied force.

But when wheels are added they can move it , because now friction force is less than applied force. Its because of the wheels , wheels are lowering the friction between the box and surafce.

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Answer 2

this is because the heavy box with no wheels is harder to move as it is exerting more friction but the wheels help to reduce friction and help to move the box with ease.