Oh gosh now I miss bowling
Weight! [ Maybe he just picked a ball out the first time in a hurry. She steps over to the rack and picks up two balls — one seven pound one, and one twelve (hers was an 18, about the heaviest one should be using) — and she holds them out to him. ] See? If you threw these, the heavier one has more power because of its mass, but is harder to steer, where the lighter one is fast but lacks punch.