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Is work done by a non conservative force...

Is work done by a non conservative force always negative ? Comment.

Text Solution

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Yes , it can be positive .
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Can work done by a non - conservative force be positive ?

Is friction a non-conservative force?

When is work done by a force negative ?

STATEMENT-1: Work-energy theorem is consequence of Newton's laws of motion. STATEMENT-2: The work done by a conservative force along a closed path is zero. STATEMENT3: Work done by a constant force is independent of the path.

Assertion:The work done by a conservative force such as gravity depends on the initial and final positions only Reason: The work done by a force can not be calculated if the exact nature of the force is not known.

Shown that work done by a conservative force on a particle moving between two points is path independent.

Friction is non-conservative force. How ?

Work done by the conservative force on a system is equal to :

Statement-1:Comets move around the sun in elliptical orbits, the gravitational force on the comet due to sun is not normal to the comet's velocity, but the work done by the gravitational force over every complete orbit of the comet is zero. Statement-2: Gravitational force is a conservative force and the work done by a conservative force over a closed path is always zero.

Knowledge Check

  • STATEMENT-1: Work-energy theorem is consequence of Newton's laws of motion. STATEMENT-2: The work done by a conservative force along a closed path is zero. STATEMENT3: Work done by a constant force is independent of the path.

    A
    T T T
    B
    T F T
    C
    F F T
    D
    F F F

  • Assertion : Work done by conservative forces is independent of path followed by the body . Reason : Work done by non conservative forces depends on the path followed by the body .

    A
    If both assertion and reason are corret and reason is a correct explanation of the assertion .
    B
    If both assertion and reason are correct but reason is not the correct explanation of assertion .
    C
    If assertion is correct but reason is incorrect .
    D
    If both assertion and reason are incorrect .

  • Work done by the conservative force on a system is equal to :

    A
    the change in kinetic energy of system
    B
    the change in potential energy of system
    C
    the change in total machanical energy of system
    D
    None of the above