Even if it’s not windy at all, my door would slam with the slightest push. Does not happen with my windows closed.
In: Physics
Two things are possibly happening. If your room is well-sealed, closed windows, and you try and close the door: the air has nowhere to go as the door closes, so it resists that last few inches of closing. I have this pretty bad in my pantry. The other thing that might be happening is a slight breeze; if there happens to be even the slightest breeze, closing the door will catch that breeze and you’ll have a kite the size of a door forcing that door closed. Keep in mind that tiny changes of pressure over the large area of a door can very quickly add up to a quite significant resulting force.
When you close a door and all the windows are closed, the air pushes back against the door, slowing it down. When a window is open, the air gets pushed out of the window and the door can close faster.
With the windows closed the door is creating vacuum or pressure in the room as it gets close to closing, which winds up slowing down the rate at which the door is moving. With them open that doesn’t happen so it closes with full force.
When your door closes it’s pushing a bunch of air mostly into the car (or room, if it’s small), and that air doesn’t have anywhere to go once it’s in there so it tries to push back against the door, providing a bit of a cushion when you close the door. If the window is open, suddenly that air can just go all the way through and isn’t pushing back on the door as hard.
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