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Assertion , No work is done if the displ...

Assertion , No work is done if the displacement is zero
Reason: Work done by the force is defined to be the product of component of the force in the the direction of the displacement and the magnitude of displacement.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true not but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
Work done
`W=Fd cos theta`
if displacement is zero, i.e. d=0, W = 0
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Knowledge Check

  • Consider the following statements The work done by the force is defined to be the product of component of the force in the direction of the displacement and the magnitude of this displacement. Wok done W=(Fcos Theta) , d=F.d which of the following option is correct ?

    A
    Only I
    B
    Only II
    C
    I and II
    D
    none of these

  • Work done by a force on an object is zero, if

    A
    the force is always perpenicular to its acceleration
    B
    the object is stationary but the point of application of the force moves on the object
    C
    the force is always perpendicular to its velocity
    D
    the object moves in such a way that the point of application of the force remains fixed

  • Work done by a force in displacing a body is an example of

    A
    vector product
    B
    scalar product
    C
    addition of vectors
    D
    division of vectors

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    For the force displacement graph shown below. Calculate the work done by the force displacing the body from x=1 cm to x=5 cm.

    Assertion : When pendulum bob is rotating in a circle around the point of suspension then work done by tension and the weight is zero . Reason : Work done by a force is defined as dot product of force vector and displacement vector .

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