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Phone Book Friction



...With all of this electricity and magnetism boggling our minds, it's nice to be reminded of the importance of mechanics once in a while. And by that I mean the force of friction: Ff = (normal force)(mu). Believe it or not, this commonly viewed as weak force can add up. Take the above myth busters clip for example, when the friction in between the sheets of a phone book in between the pages of a second phone book make them extremely difficult to separate. Try 8,000lb of force and two tank's worth of difficult! One of the tricks that creates so much of the friction is that each individual page is interlocked, increasing the surfaces that oppose each other as well as the weight of each page upon the next. Enjoy the clip :3


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