How does a nail hold two things together? How doesn’t it not fall back out of the hole it created over time?
In: Engineering
The nail rams the wood out of the way, but the surrounding wood tries to push the displaced wood back into place, the force from this results in significant friction that holds the nail in place.
This is also why nailing into the end grain (into the end of a plank) is much weaker than nailing into the side of a plank, as the wood fibers are much better able to try squash back together when you nail into the side.
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