I know that objects with the same surface area but different densities fall at the same speed in a vacuum. However, there is actually a bit of an argument between my science teachers. One science teacher thinks that heavier objects do fall faster (he provided calculations). The other one (appears) to think that this is nonsense. I decided to try it for myself. I dropped a piece of paper, and a piece of cardboard with similiar SA. The cardboard fell much faster. I could explain this by stating that heavier objects have more force to 'push' air molecules out of the way. In otherwords, heavier objects are not as affected by air resistance. Whaddya think?