Question

State if each of the following statements is true or false. Give your 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.

Answer 1

Hey mate,

◆ Answers with explanations-
a) False.
Only energy and momentum of the whole system (not individual) is conserved.

b) False.
The energy of system is affected by external forces.

c) False.
Work done in closed loop is zero only if force is conservative.

d) True.
This happens because energy is lost in form of heat & sound.

Hope that was useful...