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

If you’ve ever seen a bullet going into a Kevlar vest, it’s not like the movies where the bullet smushes onto the outside. As long as it’s a bullet the vest is rated to stop, on contact it will make a nest into the Kevlar weave because of the bullet’s velocity and rotation. (The larger the handgun round rating, the thicker and heavier the vest weave) Essentially the bullet goes in, gets tangled, and velocity is reduced to 0. The weave of course does not have the same effect to stop a knife blade.