What happens when the law of gravity+the law of inertia+steep concrete hill of the apocalypse meet up?

So I found this awesome hill with a sidewalk. My friend Kate, my skateboard, and I wanted to say hellooooo. Um, so I made it (kinda) down the hill a few times, but aborted halfway down. Anyway, so finally I committed to my death. It was fun. I actually rolled down most of the hill, and my shoe flew off. Some old lady was cackling her lung onto her front porch. "That's why I don't skateboard!" she yelled at me. I wanted to be like OH! I thought it was because you were 93 years old and can barely walk! But I go to LDSBC, so I had to be a good example. I said heh, and walked back up the hill. I went down a couple more times and abandoned ship again and again. Then I committed and went dooooooown. Then I stopped, but it's all good. I can still eat through a tube faster than mouthy old grandma over there!!!

Day after the "incident" we don't discuss.