Which of the following is correct, when a person walks on a rough surface
Which of the following is correct, when a person walks on a rough surface
The frictional force exerted by the surface keeps him moving
The force which the man exerts on the floor keeps him moving
The reaction of the force which the man exerts on floor keeps him moving
None of the above
Which of the following is correct, when a person walks on a rough surface
By Newton's third law of motion, the ground exerts back an equal and opposite force along the line of action of the force we exert on the ground. The vertical component of this reaction force balances our weight (so we do not have any motion perpendicular to the ground), and the horizontal component pushes us forward. So we move
Hence $C$ option is correct
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