What keeps your nails attached and how is it so strong?
In: Biology
So once you have hammered your nail very well in wood for example, friction arising from the surface of wood and surface of the nail stops it from sliding. This friction is static friction and is usually much higher than dynamic friction. This also explains why you can’t just put nails in any surface without a hammer , because you need to cross the coefficient of static friction by impulse generated by hammer.
Tldr friction
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