Question

Internal forces in a system can change (a) linear momentum only (b) kinetic energy only (c) both kinetic energy and linear momentum (d) neither linear momentum nor kinetic energy

Answer 1

Answer:

I hope (d) is the right answer

Explanation:

(d) Neither linear momentum nor kinetic energy

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Answer 2

Answer:

Internal forces in a system can change kinetic energy only, that too, it may or may not depending upon case.

Explanation:

Option (b) kinetic energy only is correct.

Internal forces in a system can indeed change the kinetic energy of the system. Now, you may ask how? Let us see it through a formula;

  $Work \, Done \, = \, Change \, in \, the \, kinetic \, energy$

 So,

W(interal) + W(external) = Δ K. E.

From the above, we observe that the change in the kinetic energy is not only determined by the external forces acting on the system but also due to the internal forces acting on the system.

Hence, it is clear that internal forces of a system can change the kinetic energy of the system.