We hammer the broader side of a nail and not its sharp end to put it in wood .why ?

Explanation:

We hammer the broader side of a nail instead of its sharp end to put it in wood. It is a concept based on the pressure exerted.

The force acting per unit area of an object is called pressure exerted. It means that pressure is inversely proportional to the area of cross section i.e. area increases, pressure decreases and vice versa.

The broader side of a nail has more area as compared to the sharp end. It means that the broader side will exert less pressure on them which make it easier for us to fix it into the wood.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

this would be about 43%