Screws seen pretty intuitive untill you actually start thinking about how they work. How come this tiny ridge along their edge can pull pieces of wood together with pretty amazing force?
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If you screw a plank against a wall, it’s not the screws that holds the majority of the load like a “hook”, it’s actually the plank being pressed against the wall, increasing friction, that holds the most of the load.
HOWEVER, if you instead of a plank, screw OP’s mom against the wall, the load is not held at all.
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