Impression in metal when hair struck with a hammer. Why?

A hair placed on a piece of clean new plate of mild steel leaves its impression in the mild steel when struck with a hammer.

Why????

Impression in metal when hair struck with a hammer. Why?

It is because the width of the hair is so small. When the hair is struck by the hammer, all the force (theoretically) is transfered from the hammer to the hair, and then from the hair to the steel. Thus the force used to swing the hammer is concentrated into a small area. It is also because the hair is strong enough not to be completely crushed by the hammer; the energy is able to transfer through the hair. This is because of the way hair is molecularly formed and the shape of the hair. Human hair is (mostly) cylindrical.

Impression in metal when hair struck with a hammer. Why?

i mean, it has to go somewhere..

Impression in metal when hair struck with a hammer. Why?

hair has a very storong tensile strength as a ratio of its size. it obviously is hard enough to maintain some of its shape when compressed by any force against a peice of mild steel.

Impression in metal when hair struck with a hammer. Why?

ceratine is quite a hard material - only because a hair is so slim, you don't realise that in all-day life.

just take a look at your fingernails - they are also made of ceratine - scratching skin leaves marks. scratching with nails into gold or silver also leaves marks...

the same goes for hair that is pressed into the mild steel by a hammer.