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
Nails generally should be used with sheer force applications . So if you look at a wood deck. You nail the joists together sideways. Nails are very strong with holding a sheer force. The decking boards should be screwed. Screws have a great pull force resistance.
If you screw a screw in half way and hit it with a hammer it breaks very easy because it has poor sheer resistance. Also if you ever see a deck with the decking boards nailed in a few years they will most likely be lifted.
Here is a good style explaining:
[nails vs screws](https://www.artofmanliness.com/articles/nails-or-screws/)
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