I open my window and now whenever I open or shut my bedroom door i slam it hard accidentally.
There is less air resistance to my bedroom door.
When you close the door quickly, you are pushing air out of the room. When the window is shut, this causes a temporary slight decrease in air pressure, and the difference in pressure applies a force to door to slow it down slightly.
If the window is open, as the door pushes air out of the room, more air comes in through the window, the air pressure doesn't decrease and nothing slows down the door......
can that work backwards to? like air flowing in through the door and out the window?