So I was thinking to myself, if i had a somewhat disproportionate tripodal space structure, how would i make it rotate around a chosen point where the arms of the structure (hallways and passes most likely) converged ? TORQUE AND MOMENT OF INERTIA ! Then I thought about something else, obviously if i applied rotational force to one arm, the other two would most likely form the pivot point and the actual rotation would be occurring around their center of mass. But what if it was only a bipodal structure, with one sides mass being precisely twice that of the side being rotated ? My question is, if I rotate by applying a impulse which changes direction to approximate the force of torque, vs apply two seperate but equal tangential forces on each side, does it behave the same or does translation occur for the whole structure ? The point is to make the structure rotate in place, not translate to a different location. Anyone ?