Why do internal forces acting within a system | vedclass

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Question

(A) According to Newton's third law of motion,internal forces between particles in a system always occur in pairs of equal magnitude and opposite dire

Vedclass · Accepted Answer

They cancel each other out.

Vedclass · Answer

(A) According to Newton's third law of motion,internal forces between particles in a system always occur in pairs of equal magnitude and opposite direction. Since the vector sum of these internal forces is zero,they do not contribute to the net external force acting on the system. Consequently,the acceleration of the center of mass of the system is determined solely by the net external force,as given by $F_{ext} = M a_{cm}$.

Why do internal forces acting within a system not affect its motion?

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