Question

give reason:- 1)nails have pointed ends

Answer 1

It's becoz to provide more pressure to the surface on which it is hammered. Pressure = Force/Area So since pointed shapes have very less area and since the pressure is inversely proportional to area, more pressure is produced by such surface thus helping the nails to pierce into the surface. I have edited the answer think this helped you

Answer 2

nails have a pointed ends because it covers less area & thus create more pressure