We claim that momentum is conserved. Yet most moving objects eventually slow down and stop. Explain.
We have to explain the reason, why do the moving object eventually stop even through which violates law of conservation of momentum principle.
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Law of conservation of linear momentum: If no external force acts on the system, then the final momentum of the system is equal to the initial momentum of the system. Thus momentum is conserved. Frictional force also acts on the surface of the bodies in contact whenever their is relative motion between between the two bodies.