In engineering, the code-allowable withdrawel force is zero, because the wood expands and contracts over time and the nail pull-out force can reduce to zero.
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Hammers are typically used to drive in nails. The nails are usually made of steel. If you built your hammer head of some material that was not as hard and durable as steel, it would be destroyed by the process of hammering nails.
Steel is used to form both hammer and nails.
Concrete- I remember when concrete nails were made of a forged tungsten steel.
Try a magnet!
through a utm machine tensile force is act on both bodies and check stress strain diagram and then eaisly find that who is steel and who is carbon