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Center of mass Frame of Reference





(10) Centre of mass frame of refrance

  • If we attach an inertial frame of refrance with the centre of mass of many particle system then centre of mass in that frame of refrance would be at rest or, Vcm=0 , and such type of refrance frames are known as centre of mass frame of refrance.
  • Total linear momentum of a many particle system is zero in centre of mass frame of refrance i.e., pcm=MVcm=0 since Vcm=0.
  • Therefore C-refrance frames are also known as zero momentum refrance frames.
  • Since in absence of any external force the centre of mass of any system moves with constant velocity in inertial frame of refrance therefore for a many particle system C-rame of refrance is an inertial frame of refrence.
  • Refrance frames connected to laboratory are known as L-frame of refrance or lebiratory frame of refrance.



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