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Trying to find how much work is done by friction

  1. Apr 22, 2010 #1
    1. The problem statement, all variables and given/known data
    A man drags a table 4.05 m across the floor, exerting a constant force of 51.0 N, directed 25.0° above the horizontal.

    How much work is done by friction? Assume the table's velocity is constant.


    2. Relevant equations
    work= umgxsin[tex]\vartheta[/tex]
    f=uF

    3. The attempt at a solution
    I dont understand how I am supposed to find the coefficient of friction without knowing what the mass is.
     
  2. jcsd
  3. Apr 22, 2010 #2

    Lok

    User Avatar

    E=F*x
    Energy=Force*distance

    The Force and distance need to be parallel and that is where the 25'deg angle comes into play.

    No need for mass, as people are fat enough.

    Have fun!!!
     
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