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When a person walks on a rough surface, ...

When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of his motion.

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KEY CONCEPT: Friction force opposes the relative motion of the surface of contact.
When a person walks on a rough surface, the foot is the surface of contact. When he pushes the foot backward, the motion of surface of contact tends to be backwards. Therefore the frictional force will act forward (in the direction of motion of the person)
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When a person walls on a rought surface, the frictional force exerted by the surface on the person is opposite to the direction of his motion.

These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following four responses Assertion When a person walks on a rough surface, the net force exerted by surface on the person in the direction of his motion. Reason It is force exerted by the road on the person that causes the motion.

Knowledge Check

  • When a person walks on a rought surface, the frictional force exerted by surface on the porson is opposite to the direction of his motion. It is the force exerted by the road on the person that causes the motion.

    A
    If both Accertion and Reason are true and the reason is correct explanation of the Assertion.
    B
    If both Assertion and Reason are true but reason is not the correct explanation of Assertion.
    C
    If Assertion is true, but the Reason is false.
    D
    If Assertion is false but the Reason is true.

  • Assertion: When a person walks on a rough surface, the frictional force exerted by the surface on the person is opposite to the direction of tendenc of motion his leg. Reason: If a body moves with constant velocity, then it means that body is moving along straight line & there is no acceleration.

    A
    If both assertion `&` Reason are True `&` the Reason is a corrrect explanation of the Asserion.
    B
    If both Assertion `&` Reason are True but Reason is not correct explanation of the Assertion.
    C
    If Assertion is Trie but the Reason is False.
    D
    If both Assertion `&` Reason are false

  • A : When a man is walking on a rough road, that work done by frictiona force is zero. R : Frictional force acts in the direction of the motion of the man in this case.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
    C
    If Assertion is true statement but Reason is false, then mark (3).
    D
    If both Assertion and Reason are falsė statements, then mark (4).

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