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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!
What else can I help you with?
What examples does justice McLean use?
what examples does justice mclean use in the dred scott case
When do you use the words do and does?
examples in do: I do, You do.. in does: he does, she does
Examples of iron use?
COINS DUMBAZZ
How do you use heterotelic in a sentence?
heterotelic examples
Examples of suffixes and use it in a sentence?
polynomial
What is the proper use of have and has?
Examples-He has a basketball. Do you have a basketball?
What are two examples of how animals use sounds that people can't hear?
list two examples of how animals use sounds that people cant hear.
Do you use a colon after such as?
If you are just giving one example then no but if there are two or more examples then you should use a semi-colon and seperate each examples with a comma.
5 examples and use it in a sentence?
5 example each and use them in a sentence
Examples of Advertising Strategy?
There are many examples of advertising strategy. For instance, you can use a chef to advertise a particular cooking ingredient or use a child to advertise a toy.
What are some examples of its current use?
youre but hahah
Do frogs use external fertilisation examples?
Yes
