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Frictional Force

When a person...

Question

When a person walks on a rough surface

A

the frictional force exerted by the surface keeps him moving.

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B

normal reaction of the force applied by the man on the surface keeps him moving.

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C

the force applied by the man keep him moving.

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D

weight of the man keeps him moving.

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Solution

The correct option is B the frictional force exerted by the surface keeps him moving.
Person exerts force on the ground which causes the ground to exert the frictional force. This force helps to move forward. If there is no frictional force like on the ice, a person cannot walk.

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