I have just recently completed a lab in Conservation of Energy. My course is through correspondence, so my labs are virtual. I noticed that the heavier the ball was, the haters the total energy dropped as the ball continued to bounce. Now I understand that energy can be transferred into many different things (heat, sound etc...), and would have to overcome air resistance. Assuming that all properties of each ball where the same, except for mass; Why does the heavier ball lose total energy quicker than the lighter ball?