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In case of circular motion a body, if ta...

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

Text Solution

Verified by Experts

The correct Answer is:
B
Since there is no displacement along radius vector hence work done is zero by contripetal force, but for tangential force there is displacement `= 2 pi R`, so work done is not zero.
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Knowledge Check

  • In Q.4. work done by tangential force on the body is

    A
    zero
    B
    non-zero
    C
    sometimes zero and other times not
    D
    cannot say

  • 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.

  • An unbalanced force acts on a body. The body

    A
    must remain at rest
    B
    must move with uniform velocity
    C
    must be accelerated
    D
    must move along a circle

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