A cup with a mass/weight at the bottom was filled with cotton and an egg was place inside for a physics project. As the cup was falling, it would always re position itself to fall with the bottom/heavier half first (the bottom contains the mass). Would it make sense to explain this case this way: After a test drop with a plastic egg, the plastic cup had tipped over and landed on its side. This issue was resolved by placing a mass at the center of the bottom of a second cup, and placing the first cup on top. Because the bottom half of the device was now heavier, it would be less affected by air drag than the top half, and the egg-helmet would always position itself in mid-air with the heavier half at the bottom. This repositioning was a result of the collision with the cup and all the stationary air molecules in the way. The half with more mass will have more momentum to spare among the air molecules that it encounters, thus maintaining more speed than the lighter half. Thanks!