Hey all, I was hoping to settle a debate once and for all. Suppose you've got two identical objects, in our hypothetical situation they were mini-vans. One of these is empty and the other is filled with something heavy like lead so that it is 100x the weight of the empty one. Both objects therefore have the same aerodynamic properties, but one is much heavier and therefore much more dense than the other. If we were to release these objects from the same height at the same time (in an environment such as the earth's atmosphere, not a vacuum) would they hit the ground at the same time? Since the rule of thumb that "all objects fall at the same rate" has the qualifier that the objects must be in a vacuum, I am tempted to believe that the denser object would fall faster. At the very least, I would think that it has a higher terminal velocity. To attempt to prove this, I proposed the following thought experiment: Suppose you've got two sheets of paper that you fold into identical cubes. One of the cubes is left empty while the other is filled with something rather heavy. We notice significant air resistance in paper, so I thought this would be a suitable example. The counterargument proposed was that the paper would deform from the air hitting it and therefore change shape. I don't believe that such a change would be significant, but I think that even if I used something slightly more sturdy (like balsa wood) the results would speak for themselves. Please chip in any knowledge you can, with links if possible. Thanks!