Nail
part · 3400 BC · Stone Age
A metal rod for fastening parts together.
Principles and materials it uses
- Iron — is made of. Nails were forged from iron.
- Wedge — uses. The point of a nail pushes the wood apart.
- Copper — is made of. The first nails in Egypt were copper.
Where it is used
- Horseshoe — is used in. It is nailed on.