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hi there! not sure what you mean by "useful friction" but I'm guessing that you're asking "what examples are there where friction is useful" A simple example is that of sandpaper. Where you need to smoothen something and using a smooth (ie frictionless sandpaper) would be useless. A more day to day example would include the friction between your shoes and the ground without which you would be unable to walk with (like skating on ice). In fact, friction is required for you to grab anything (even a book which would slip off your fingers without friction). As for an explicit use of friction there's "Friction Welding" where mechanical friction is used to weld metal together. An article may be found on our friend Wikipedia. http://en.wikipedia.org/wiki/Friction_welding How this helps anybody reading! Cheers!
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