Why can’t a bullet proof vest protect you from a knife stab?

Question

I mean, it’s designed to stop a bullet which delivers much more force than a human being can ever produce during stabbing

In: 784

Answer 1

Bullet is a hammer, knife is a needle, kevlar and similar materials can bend a lot to take a blow (bullet/blow). They suck at being hard enough to stop high pressure penetration like a needle. Bullet is still going to hurt like a complete hammer blow, it just won’t continue to travel through you.

However with that said a knife attack on a standard vest if not going to cause a lot of harm. It may penetrate but not likely enough to cause significant harm. Just bloody cuts, not guts and gushes.