Tuesday, July 1, 2008

Would a person get hurt or die if he lies on a bed of nails?

If your answer is yes, watch the following video featuring the world-renowned magician Criss Angel as he attempts to lie on a bed of coarse nails with a heavy vehicle on top of him!




How is it plausible that Criss did not even have a piercing wound on his back with all the weight acting on him?

The key lies in the fact that there are many nails on the nail bed which increases the surface area in contact with Criss' back. From our understanding of pressure (= force / area), pressure is reduced when the area increases. Moreover, the nails are broad and this has the effect of increasing the area of the sharp points in contact with Criss as well.

Hence, having the right number of nails to "defray" the weight (force) ensures that the pressure of his body weight on the nails do not get high enough to induce piercing. This allows Criss to preserve his life and keeping as a dare-devil magician! Criss is a magician who understands Physics and the concept of pressure well...

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