Quote:
Originally Posted by JohnKSa
Right, they have identical speed and acceleration because they are being accelerated to the rear as a unit by the force on the brass.
All of the force from firing applied is applied to the brass. All of the acceleration from firing is the result of force on the brass.
Since the brass and the rifle are being accelerated as a unit and all of the force applied by firing the rifle is applied to the brass, how does it make sense to divide up their masses and consider them separately?
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The force is indeed going to the rifle through the brass. But that also means the rifle is also applying reaction force to the brass. The difference of this two forces is the net force that accelerates the brass. That net force is close to zero because of the brass' light weight.
-TL
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