You can easily make a dash potdashpot. A piece of string or wire attached to the top corner furthest from the hinge through a hoop or hook near the frame so that the remaining string shortens when the door opens. This goes to a tincan of beans or some equalityequally heavy object which is suspended in a long tube of oil or water on a shelf nearby.
Grammar fixes; dashpot is all one word. Also added a wiki link to define the term.
SurpriseDog
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