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

In Stargate, Goa’uld’s personal defense shields deflection capability is directly proportional to the amount of kinetic energy being directed at it. Thus, a bullet moving at high velocity will be repelled by the shield, but a much slower-moving projectile, such as a dart, will successfully penetrate it