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My objection was to both. I never said it because in this case angular momentum is conserved about any point in space since there are no torques acting on the two-mass system about any point in space. I think I'll write something up to clarify these issues, because the idea is quite simple.erobz said:What was your objection to the statement; that you never said it, and/or that it is not true? Because in the end, we can take angular momentum about any axis ( as you showed previously in post #178), but it is ultimately conserved about the systems center of mass in either case. i.e. ##\omega ## is to be applied about the systems center of mass, not about the arbitrary axis?