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Work done by a frictional force is...

Work done by a frictional force is

A

negative

B

positive

C

zero

D

all of the above

Text Solution

Verified by Experts

The correct Answer is:
D
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STATEEMNT-1 : Work done by frictional force is always either negative or zero. because STATEMENT-2 : Work done by the static friction on a system may be zero.

A trolley car starts from rest at the top of a hill as shown in figure -3.9 and moves down the curved track. Determine its speed as it reaches the bottom. Assume that the work done by frictional forces is negligible.

Knowledge Check

  • Work done by frictional force

    A
    Is always negative
    B
    Is always positive
    C
    Is zero
    D
    May be positive, negative or zero

  • A : Work done by the frictional force can’t be positive. R : Frictional force is a conservative force.

    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).

  • Assertion : Work done by the frictional force is negaive Reason : This is because frictional force acts along the dirction of motion

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

    • Similar Questions

    Explore conceptually related problems

    Find the work done by the frictional force in drawing a circle of radius r by a pencil of negligible mass with a normal pressing force N ( coefficient of friction mu_(k) ).

    The work done by the frictional force on a surface in a drawing a circle of radius r on the surface by a pencil of negligible mass with a normal pressing force N ( coefficient of friction )is :

    A block of mass of 1 kg slides down a curved track that is one -quadrant of circle of radius 1m. Its speed at the bottom is 2 m/s . The work done by the frictional force is

    A block of mass 1 kg slides down a vertical curved track that is one quadrant of a circle of radius 1m. Its speed ast the the bottom si 2 m//s . The work done by frictional force is :

    Assertion :- Work done is positive when force acts in the direction of displacement. Reason :- Work done by frictional force can not be positive.

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