University Physics - 13 Edition - Chapter 4 - Problem 36dq
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# If your hands are wet and no towel is handy, you can

University Physics | 13th Edition

Problem 36DQ

If your hands are wet and no towel is handy, you can remove some of the excess water by shaking them. Why does this work?

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Solution 36DQ When you shake your hands,the water is accelerated and gathers momentum.when you suddenly stop your hands or you change direction,the momentum of water resists the sudden change and continue to moving in the direction it started.since your hand no longer moving in said direction,the water is then released and your hands now have less water on them. Here in above processes,mass plays a big role in the removal of water by shaking,therefore it is easy to remove big droplets,but more often than,your hands will not be completely dry.this is because smaller water droplets cannot carry enough momentum to be released by shaking.shaking harder or faster will improve the situation. Or Shaking your hand,you are applying more force on water drops sticking to the hand than the adhesive force of water with hand which detaches the water from the hand. Adhesive force is depends upon the size of water drops sticking to the hand and is inversely proportional to the size,smaller size water drops do remain sticking and you have to wait till they evaporate out.

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