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) The 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.

Answer 1

Explanation:

a. False

The momentum and the energy of both the bodies are conserved and not individually.

b. False.

The external forces on the system can do work on the body and are able to change the energy of the system.

c.False.

The work done by the conservative force on the moving body in a closed loop is zero.

d.True

The final kinetic energy is always lesser than the initial kinetic energy as there will be always a loss of energy in the form of heat, light, etc.

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