When a person pulls a heavy box placed on a rough surface as shown in the figure given below, he has to apply a force against:

his own weight

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friction

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muscular force

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the gravity of Earth

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Solution

The correct option is B friction
Friction is a force that opposes relative motion between any surfaces that are in contact. When a person pulls a heavy box placed on a rough surface, he needs to overcome the force of friction to be able to pull the box. This is because the surface of the base of the box is in direct contact with the rough floor surface. Due to the roughness of the surface, it will tend to stop or oppose the motion of the box. Therefore, the person needs to apply a force against friction.

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