Assertion (A): When a person walks on a rough surface, the net force exerted by surface on the person is in the direction of his motion.
Reason (R): Friction force by road on person is against motion.
Solution:
Assertion (A) is true: To walk, a person pushes backward on the ground. By Newton's third law, the ground exerts a forward static friction force on the person's feet. This forward friction, combined with the normal force, creates a net force from the surface in the direction of motion, propelling the person forward.nReason (R) is false: For walking, the friction force exerted by the road on the person's feet is *in the direction* of the person's motion (forward friction), enabling propulsion. If friction were against the person's motion, walking would be impossible. Therefore, (A) is true but (R) is false.
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