I have a physics lab on centripetal force and I'm stuck on an anaylsis question. The lab requires me to have a piece of string with masses on opposite ends threaded through a tube. The mass at the bottom should hang, while the mass on the top are swung in circular motion. The question asks, if the masses on the top and bottom were to be doubled, what effect would it have on velocity? I predicted that there would be no effect because the masses are still proportionate to one another, but in the experiment I got something completely different. Can you help me?