What is meant by a system, and how is it related to the conservation of momentum?

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Atul Chhotray Profile
Atul Chhotray answered
A system is a certain number of objects under consideration. It can be only one object or it can be multiple bodies.

When we talk about a system we ignore the forces that are exerted by the particles/ bodies forming the system on each other. These forces are internal forces and using the third law they form action reaction pairs and hence cancel out as a whole.Therefore for such a system the Linear Momentum is Conserved if no external force acts on the system.

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