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Byju's Answer

Standard XII

Physics

Work Energy Theorem

The work done...

Question

The work done by a body against friction always results in:

Loss of kinetic energy

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Loss of potential energy

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Gain of kinetic energy

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Gain of potential energy

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Solution

The correct option is B Loss of kinetic energy
Friction always opposes motion. A body does work against friction at the expenses of its kinetic energy. Hence, the work done by a body against friction always results in loss of kinetic energy.

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Similar questions

Underline 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 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 energy of the system of two bodies.

(a) Work is said to be done by a force only when _________

(b) Work done = Force $\times$ _________

(d) The S.I. unit of energy is ______

(e) The potential energy of a body is due to its ______ and kinetic energy of body is due to its ______

(f) Gravitational potential energy U = mass $\times$ force of gravity on unit mass $\times$ _________

(g) Kinetic energy = $\frac{1}{2} \times m a s s \times$ _________

(h) Power P = ______ / time taken.

(i) The S. I. unit of power is ______

(j) 1 H.P. = ______ W

Q. Assertion :A work done by friction is always negative. Reason: If frictional force acts on a body its kinetic energy may decrease.

A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7 N on a table with coefficient of kinetic friction = 0.1.

Compute the

(a) work done by the applied force in 10 s,

(b) work done by friction in 10 s,

(d) change in kinetic energy of the body in 10 s,

and interpret your results.

Q. The potential energy of the block at the top of a rough incline is

20 J

. If the work done against friction while sliding down is

5 J

. Then the kinetic energy of block on reaching bottom is

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The work done by a body against friction always results in:

The correct option is B Loss of kinetic energyFriction always opposes motion. A body does work against friction at the expenses of its kinetic energy. Hence, the work done by a body against friction always results in loss of kinetic energy.

The correct option is B Loss of kinetic energy
Friction always opposes motion. A body does work against friction at the expenses of its kinetic energy. Hence, the work done by a body against friction always results in loss of kinetic energy.