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Net Contact Force

Which of the ...

Question

Which of the following is correct when a person walks on a rough surface?

A

The normal reaction exerted by the surface keeps him moving

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B

The force which the man exerts on the floor keeps him moving

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C

The reaction of the force which the man exerts on floor keeps him moving

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D

None of the above

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Solution

The correct option is C The reaction of the force which the man exerts on floor keeps him moving
The reaction force helps him moving. The man pushes the floor in the backward direction and the reaction force that the floor exerts in forward direction helps him move.

If there is no reaction force from ground $N = f = 0$ , hence he cannot move.

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