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 see this being mentioned but I’m not reading every branching thread here, but in case it got missed.

The bullet gets all of its energy in an instant and cannot get anymore.
If you’re stabbing with a knife, you can… like… keep pushing.

In terms of actual energy you’re imparting? I can put a LOT more force into a knife than one powder-charge puts into a bullet, I just can’t do it as quickly.