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Homework Help: Friction help

  1. Nov 13, 2004 #1
    i've been trying to figure this question out for about half an hour now and i'm still where I started. if some one could help me i'd be much obliged.

    a 17 kg box is released on a 35 degree incline and accelerates down the incline at .270 m/s^2. Find the friction force impeding its motion. How large is the coefficient of friction?
     
  2. jcsd
  3. Nov 13, 2004 #2
    F-Ffriction=ma
    (17kg*9.8m/s^2*sin35)-Ff=17kg*.27m/s^2
    Ff=91N
     
  4. Nov 13, 2004 #3
    i kind of understand what you did but its not the answer. i'm using the webassign program that lets you check your homework and i tried that answer and it didn't turn out right.
     
  5. Nov 13, 2004 #4
    what answer did you plug in? Try 91N, 92N, or 93N

    I'm leaving the coefficient of friction for you to solve
     
  6. Nov 14, 2004 #5
    92.9N.
    I got this
     
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