Because you can knock a door with your hand down as well and it would be more convenient?
In: Physics
I can definitely generate more power in my knock if I can get my elbow involved.
Deconstructing how I knock, the first knock is usually testing the resonance of the material, and I can adjust the power up to maximum for subsequent knocks if needed. Some doors are hollow wood, some are insulated steel, and paint makes everything look fairly identical.
Related question now that I’m thinking about it, I wonder if our current propensity to knock with palm forward knuckles was as pronounced before the ubiquity of keyboards? I do seem to recall the backhand knock to be very common in classic movies, but maybe that was so the actor could present his face to the camera more easily.
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