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Friction Problem

  1. Nov 2, 2004 #1
    Friction Problem!!

    A Man dragged a 51 Kg bag at a 45 degree angle with a force of 400 N. The bag moved along hte pavement with a constant speed. What is the coefficient of static friction?

    OK SO, you can make a triangle and figure out that 283 N are pulling horrizontal and 283 pulling vertically. But im not sure how to plug any of that into the

    F=(Friction coef)N

    where F is force of friction, and N is normal force...

    How do i find the coeff. of static fricton?

    Another one that is similar is the following:

    In grass-skiing, a man goes down at 92 Km/hr. It takes him 6.6 to reach that speed from rest at a 35 degree incline. His mass is 75 Kg. What is the coeffcient of friction between the grass and his skis that day?

    I'm totally lost....help please!?
     
  2. jcsd
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