Underlinethe correct alternative:
(a) When a conservative force does positive work on a body, thepotential energy of the body increases/decreases/remains unaltered.
(b) Work done by a body against friction always results in a loss ofits kinetic/potential energy.
(c) The rate of change of total momentum of a many-particle systemis proportional to the external force/sum of the internal forces onthe system.
(d) In an inelastic collision of two bodies, the quantities which donot change after the collision are the total kinetic energy/totallinear momentum/total energy of the system of two bodies.

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Solution

Answer:
(a) Decreases
(b) Kinetic energy
(c) External force
(d) Total linear momentum
Explanation:
(a) A conservative force does a positive work on a body when it displaces the body in the direction of force. As a result, the body advances toward the centre of force. It decreases the separation between the two, thereby decreasing the potential energy of the body.
(b) The work done against the direction of friction reduces the velocity of a body. Hence, there is a loss of kinetic energy of the body.
(c) Internal forces, irrespective of their direction, cannot produce any change in the total momentum of a body. Hence, the total momentum of a many- particle system is proportional to the external forces acting on the system.
(d) The total linear momentum always remains conserved whether it is an elastic collision or an inelastic collision.

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Similar questions

(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.

(b) Total energy of a system is always conserved, no matter what internal and external forces on the body are present.

(d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

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