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The work done by kinetic friction on a b...

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

Text Solution

Verified by Experts

The correct Answer is:
C
Work done by kinetic friction on a body is may be `+ve,-ve` or zero.
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Knowledge Check

  • 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

  • (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

  • The work done by a force acting on a body is as shown in the graph. What is the total work done in covering an initial distance of 20m? If the work done by a force acting on a body is as shown in the graph .

    A
    225J
    B
    200J
    C
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    D
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    In the arrangement show in figure, the track is frictionless until the body reaches the higher level. A frictional force stops the body in a distance d from A. The initial speed of the body v_(0) is 6 m/s the height h is 1 m and the coefficient of kinetic friction is 0.2. What is the work done by friction force on the body during the motion.

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