What is the physical explanation of the point of a knife?

Question

What is the physical explanation of the point of a knife?

Answer 1

the point of the knife concentrates all your force onto a minuscule section of the object. this allows the point to do more damage than if that force was spread out.  

Answer 2

Well if the end of the knife was Flat, like a plank of wood and pressed into something the pressure would be spread out across the entire flat peice of wood but i it was a sharp point all the pressure would be condensed to that one point and be able to pierce things.

Answer 3

The pressure equal force divided by air of the surface (P = F/A).

So the end which makes the pressure must have a very very small air!!