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

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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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Take your palm and press it against your cheek as hard as you can. Now take your index finger and do the same.

Which was more unpleasant? That’s because you’re using a similar amount of force on a smaller area.

Bulletproof vests can withstand a bullet because the force is spread out amongst a larger area. A knife will exert force on a teeny tiny area and go right through.

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