I mean, it’s designed to stop a bullet which delivers much more force than a human being can ever produce during stabbing
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The answer is that a bullet-proof vest can protect you from knife wounds, depending on the vest. A lot of them have metal or ceramic plates inside the vest, and those plates would protect against a knife’s cutting edges. But some vests are also made of just kevlar fibers, and a knife would be able to “push apart” and/or cut these fibers; these vests would NOT protect against a knife attack.
Materials behave differently at different speeds, and a good example of this is water. You can very easily slide into water from standing at the edge of the pool, but jumping from a bridge or from a helicopter so you impact with a lot of speed, that will be lethal to you; the water will feel like a cement surface at the moment of impact.
And a lot of vests are designed like this, they will break apart the bullet and stop its huge speed, but something as slow and sharp as the tip of a knife will just easily push apart the fabric fibers and penetrate into your chest. The difference is that the kevlar material has inertia and does not “move out of the way” at bullet speeds (it feels like a solid surface), but easily moves out of the way when trying to work the point of a knife into it.
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