If I apply a velocity to move a group of atoms (CNTLeft) at the left end of a CNT (say 3 rings) (and fix the other end).
Will the force given by, say compute reduce sum fx on this group, include the forces exerted by the right end (remaining part) of the CNT. If it does then the net force outputted should be zero. If it doesn’t, I should get the tensile force (the force that the other side exerts on the left side). I am wondering which is the case?