A hammer is essentially a weight attached to a handle. Almost anything can be used as a hammer, even a piece of wood, though a stone is better. The aim is to concentrate a lot of force into one small area so as to flatten or bend materials, or to force a nail through an object.
4)Hammer: Almost anything hard can be used as a hammer! Even a piece of wood can be used if necessary, although a stone is better.. If you are hammering a nail using a piece of wood as the hammer you can attach a bottle top at the impact point.
Placing the object you are hammering onto a hard surface will make your blows more effective.