I have a first clock tied to a string. At the other end of the string is the second clock. I swing the second clock around the first clock. I bring the second clock near the speed of light, while the first clock is at near rest compared to me. A constant force must be applied to the first clock to keep the second clock spinning around it. Does this constant force that produces a near light speed for the second clock mean that the static energy is the same for both clocks? If not, then does energy become denser in one of the clocks? If the energy becomes denser in one clock, it must be transfered to this denser area during acceleration. Since both clocks have the same quantity of mass, the internal motion of one clock's mass must then be greater for energy to be denser. Where is this energy transfered from but the other clock? It is transwered during acceleration. During constant rotational motion, the energy gradiant from the first clock to the second clock stays constant. During deceleration, the energy transfered to the clock with greater energy is transfered back to the clock from which the energy came. Therefore, no time change can occur, because energy transfer was equal and opposite in direction during the periods of speed up and slow down. If the energy doesn't become denser, then there just isn't a density effect and again time couldn't be different in each clock, even during acceleration. If things at high speeds do appear to have time traveled, then some other force must interact according to the previous logic. Or what am I missing or mixing up here?