Because you can knock a door with your hand down as well and it would be more convenient?
In: Physics
This is an awesome question.
Raising your hand first changes the muscles groups, what joints get stressed, if gravity is working for you or against you, how close you have to be to the door, etc.
Having your hand down and flicking your wrist to hit the door with knuckles may sound easier on paper, but it’s more likely to be uncomfortable, painful, requires you stand uncomfortably close to the door, and uses more energy to get a loud knock.
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