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Work done by kinetic friction can be...

Work done by kinetic friction can be

A

positive, negative or zero

B

positive only

C

negative only

D

zero only

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Can the work by kinetic firctionon an object be positive? Zero?

A : Work done by friction can increase the kinetic energy of the body. R : Friction is a type of contact force and it always opposes the relative motion or tendency of relative motion.

Knowledge Check

  • The work done by kinetic friction on a body :

    A
    is always negative
    B
    is always zero
    C
    may be `+ve,-ve` or zero
    D
    is always positive

  • (A) : Kinetic friction force is non-conservative in nature . (R) : Net work done by kinetic friction on a block is always completely converted into heat .

    A
    If both A and R are true and R is the correct explanation of A .
    B
    If both A and R are true but R is not correct explanation of A .
    C
    If A is true but R is false .
    D
    If A is false but R is true

  • Consider following statement (A) Work done by pseudo force in non-inertial frame itself cannot be positive (B) Net work done by static friction on the system (consisting surfaces I contact) is always zero (C) Net work done by Kinetic friction on the system (consisting surfaces in contact) may be positive (D) Work done by kinetic friction on a body may be positive Select correct alternative :-

    A
    A, B and C
    B
    B and D
    C
    A, B and D
    D
    A, B, C and D

    • Similar Questions

    Explore conceptually related problems

    A ball is given a speed v o a rugh horizontal surface. The ball travels through a distance l on the surface and stops. A. What are the initial and final kinetic energies of the ball? b. What is the work done by the kinetic friction?

    Kinetic Friction is

    STATEMENT-1 Work done by static friction in any reference frame is zero STATEMENT-2 If work done on the body is positive its kinetic energy increases.

    Assertion :- Work done by frictional force may be sometimes path independent. Reason :- Frictional force is a non - conservative force.

    Work done by a frictional force is

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