This is a just for fun question. I saw the movie "Contact" and they built a machine that generated gravity by spinning rapidly. I assume this comes form general relativity. Is this correct? My question then is this. Is there a simple formula that can be used in which something moving in an orbit / accelerating can have its mass increase as a result of increase in acceleration. I would love to have that equation and put it into my graphing calculator. If you could show example that would be great.