In a closed, isolated system of particles, forces internal to the system do not change the...

In a closed, isolated system of particles, forces internal to the system do not change the motion of the system as a whole. The velocity of the center of mass of such a system is unchanged unless the system is impacted by some net external force. In this context, and with the aid of a single illustration, explain what is meant by a) internal force, and b) external force. c) Explain why internal forces have no effect on the system’s motion.

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genius_generous answered 2 years ago

Consider three particles that interact with internal forces given by ? ⃗ 1→2, ? ⃗ 3→1,...

Consider three particles that interact with internal forces given by ? ⃗ 1→2, ? ⃗ 3→1, etc. The total force on the system is the sum of these internal forces with any external forces (? ⃗ i,ext , ?ℎ??? ? = 1,2,3). By writing out the sum explicitly, use Newton’s third law to prove that the total acceleration of the system is only due to the external forces.

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In a closed, isolated system of particles, forces internal to the system do not change the...

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