Hey this is just a random question, but recently I've started studying physics, only last year. Before this I never used to question really alot of things i took for granted, but now I see the world with a different light although I'm still quite the novice. Something that used to make me think, when I walk past my bathroom door really fast, it will swing on it's on towards me. I make no contact with the door, as I tested it a few times. My first assumption was it had something to do with friction of my body and air particles causing them to go into motion and collide with the door at a Force (N). But if this was so, wouldn't the door swing away from me? Does anyone have any ideas on this? I think it's quite interesting.