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If a man is walking, then the direction of friction is:

1. opposite to direction of motion
2. same as that of direction of motion.
3. perpendicular to direction of motion.
4. \( 45^{\circ} \) to the direction of motion

Correct answer: opposite to direction of motion

Solution

When a person walks, the foot pushes the ground backward, and the ground exerts friction on the foot forward to prevent slipping. Thus, the friction on the man acts opposite to the backward push of the foot and supports forward motion.

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