The Ethan Update: Mr. Wizard Edition

At dinner recently, we were discussing space and the subject of gravity came up. Ethan told us, "You need gravity to die from a fall; otherwise, you'd just float around. Also, it's not the fall that kills you, it's the impact." Katie doubtfully said, "Really?" Ethan replied, "Katie. I'm in *fifth grade*. I've studied Isaac Newton." He then told us he even knows Newton's middle name. So, America, please address all your physics questions to Ethan Brown PhD, PO Box 12345...