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Assertion : In circular motion work done...

Assertion : In circular motion work done by all the forces acting on the body is zero.
Reason : Centripetal force and velocity are mutually perpendicular.

A

If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

B

If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.

C

If Assertion is true, but the Reason is false

D

If Assertion is false but the Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
In non-uniform circular motion (when speed constant) work done by all the forces is zero.
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Centripetal force is provided by the real forces acting on the body in motion.

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Knowledge Check

  • A body is undergoing non-uniform circular motion. Work done by radial force on the body is

    A
    zero
    B
    positive
    C
    negative
    D
    none of these

  • In case of circular motion a body, if tangential force also acts on the body in addition to centripetal force, then work done:

    A
    by tangenitial force is zero by work done by centripetal force is not zero.
    B
    by tangenitial force is zero but work done by tangential force is not zero.
    C
    by both the forces is positive
    D
    by both the forces is zero

  • In case of circular motion a body , if tangential force also acts on the body in addition to centripetal force , then work done

    A
    by both the force is zero
    B
    by both the force is positive
    C
    by centripetal force is zero but work done by the tangential force is not zero
    D
    by centripetal force is zero by work done by tangential force is not zero

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    Assertion : In circular motion, the centripetal and centrifugal force acting in opposite direction balance each other. Reason : Centripetal and centrifugal forces don’t act at the same time.

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