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The work done by a body against friction...

The work done by a body against friction always results in

A

loss of kinetic energy

B

loss of potential energy

C

gain of kinetic energy

D

gain of potential energy

Text Solution

Verified by Experts

The correct Answer is:
A
Friction always opposes motion. A body does work against friction at the expense of its kinetic energy. Hence, the work done by a body against friction always results in loss of kinetic energy.
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Underline the correct alterntaive: a) when a conservative force does positivie work on a body, the potential energy of the body increase/decreases/remains unaltered. work done by a body against friction always results in a loss of its kinetic /potential energy. c) The rate of change of total momentum of a many-particle system is proportional to the external force/ sum of the internal forces on the system. d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total enregy of the system of two bodies.

Point out the correct alternative : (a) When a conservative force does positive work on a body , the potential energy of the body increases // decreases // remains unaltered. (b) Work done by a body against friction always result in a loss of its kinetic // potential energy. (c) The rate of change of total momentum of a many particle system is proportional to the external force // sum of the internal forces of the system. (d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy // total linear momentum // total energy of the system ot two bodies.

Knowledge Check

  • Work done upon a body is

    A
    a vector quantity
    B
    a scalar quantity
    C
    always positive
    D
    always negative

  • the work done against force of friction is

    A
    8.7 J
    B
    10.7 J
    C
    7.8 J
    D
    12.7 J

  • 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

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