I've simplified my question to make it easier to explain; I'm trying to find a way to determine the motion of a freely turning body as resultant of 2 counter-weights on rotating arms. Here's my write-up: Description: Electric motors turn both orange shafts clockwise at constant angular velocity. Both weights start out closest to the center blue shaft as shown in Position 0 and rotate with their respective orange shafts. The orange shafts turn freely with respect to the green arms, and the green arms turn freely with respect to the blue shaft. All objects’ masses are negligible except for the red counterweight blocks, and the blue shaft is grounded. See pictures for positions 0, 1, and 2 for the relative motion of the red arms at 90 degree intervals. Question: What is the rotational position of the green arms over time? What factors will affect this motion? Thanks for any help you can offer! Let me know if there's anything I can clear up about the situation.