The Ultrafast Snap Of A Finger Is Mediated By Skin Friction

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Researchers investigated the mechanics behind the finger snap under the scope of a latch-mediated spring-actuated system (LaMSA), where, in technical terms, “energy is loaded in a mass–spring system by an external motor over a relatively long period of time before being held in place with a latch.” A snap of the finger is found to deliver the greatest rotational acceleration seen in humans, reaching an accelation of 1.6 106° s2 in 7 ms. The key seems to be in the friction that our skin provides, acting as the “latch”. Read full article here

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