I have a final exam in a mechanical vibrations course this week and I know what one of the problems might be like. It consists of a spring/mass/damper system (like a car supsension) that travels over a series of hills in a sinusoidal pattern. The car suspension has a unique coordinate system (Y) and the wheel at the base of the system has a unique coordinate system (X) and both move differently. The problem would involve analyzing it somehow. I wish I could draw the picture. I can't seem to find anything like it in the textbook or the internet. My professor is crazy about Conservation of Energy when analyzing systems like this. Any Ideas? Any help would be greatly appreciated!