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

I don’t know what you mean by “vest” I’m assuming you are talking about soft armor though. Reading quite a few of the answers here, many are assuming the same thing. I can assure you though, no one is stabbing a knife through lvl 4 ceramic plates.