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Standard XI
Physics
NCERT
Question

State if each of the following statements is true or false. Give reasons for your answer.
(a) In an elastic collision of two bodies, the momentum and energy of each body is conserved.

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

(c) Work done in the motion of a body over a closed loop is zero for every force in nature.

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

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Solution
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(a) False. In an elastic collision of two bodies, the momentum and energy of the system is conserved.

(b) False. Some energy is lost in heat, so it is not conserved.

(c) False. It is true only for conservative forces. For non-conservative forces, work done over one cycle is not zero.

(d) True. Some energy is lost in internal friction and heat.

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Similar Questions
Q1
State if each of the following statements is true or false. Give reasons for your answer.
(a) In an elastic collision of two bodies, the momentum and energy of each body is conserved.

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

(c) Work done in the motion of a body over a closed loop is zero for every force in nature.

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

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Q2
Kinetic energy of a system is always conserved, no matter what internal and external forces on the body are present
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Q3
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.
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Q4
State TRUE or FALSE for given STATEMENTS , Give REASON for FALSE statement :
(i) Total mechanical energy is always conserved in collision .
(ii) Kinetic energy is always conserved in collisions .
(iii) Velocity before and after collision of respective bodies remain same .
(iv) Total momentum is always conserved in collisions .
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Q5
In an inelastic collision of two bodies, the final kinetic energy is less than the initial kinetic energy of the system.
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