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Homework Help: Does Friction have Units?

  1. Dec 2, 2008 #1
    1. The problem statement, all variables and given/known data
    Does Friction have units?


    2. Relevant equations

    U = Ff / Fn



    3. The attempt at a solution

    I know the coefficient which is "Mew" U, has no units whatsoever but I just wanted to know if friction itself had units.
     
  2. jcsd
  3. Dec 2, 2008 #2

    rl.bhat

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    Homework Helper

    U is the coefficient of friction.It is the ratio of two dimensionally similar quantities, just like refractive index. So it has no units.
     
    Last edited: Dec 2, 2008
  4. Dec 2, 2008 #3

    Doc Al

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    Staff: Mentor

    What do you mean by "friction itself"? The force of friction certainly has units, just like any other force.
     
  5. Dec 2, 2008 #4
    ^ What units would the force of friction have?
     
  6. Dec 2, 2008 #5

    Doc Al

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    Staff: Mentor

    The same units as any other force.
     
  7. Dec 2, 2008 #6
    So Newtons then?
     
  8. Dec 2, 2008 #7

    Doc Al

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    Staff: Mentor

    Exactly.
     
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