How internal forces contribute in determining the motion of centre of mass?
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However it's not clicking with me, mainly because I can't seem to piece together why the above is true. j and i refers to particles, so Fij refers to the force on the ith particle due to the jth particle. From what I gather, it's saying when some particle i pushes on another particle j, that pushed particle j exerts an equal and opposite directed force on
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Even if the shell explodes in flight, the center of mass - often called eM - will continue to follow the same parabola. The forces acting during the explosion are all internal forces for the system and as such they cannot contribute to the acceleration of the center of mass.
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