Friction and Contact Area
It is an empirical fact for many materials that F = μN, where F is the frictional force for sliding friction, μ is the coefficient of friction, and N is the normal force. There isn't a simple derivation for sliding friction's independence from area.
Read more about this topic: Contact Area
Famous quotes containing the words friction and, friction, contact and/or area:
“The admission of Oriental immigrants who cannot be amalgamated with our people has been made the subject either of prohibitory clauses in our treaties and statutes or of strict administrative regulations secured by diplomatic negotiations. I sincerely hope that we may continue to minimize the evils likely to arise from such immigration without unnecessary friction and by mutual concessions between self-respecting governments.”
—William Howard Taft (1857–1930)
“We have got onto slippery ice where there is no friction and so in a certain sense the conditions are ideal, but also, just because of that, we are unable to walk. We want to walk so we need friction. Back to the rough ground!”
—Ludwig Wittgenstein (1889–1951)
“To write weekly, to write daily, to write shortly, to write for busy people catching trains in the morning or for tired people coming home in the evening, is a heartbreaking task for men who know good writing from bad. They do it, but instinctively draw out of harm’s way anything precious that might be damaged by contact with the public, or anything sharp that might irritate its skin.”
—Virginia Woolf (1882–1941)
“... nothing is more human than substituting the quantity of words and actions for their character. But using imprecise words is very similar to using lots of words, for the more imprecise a word is, the greater the area it covers.”
—Robert Musil (1880–1942)