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Static friction and kinetic friction

  1. Apr 21, 2013 #1
    A chuck is sliding downward an inclined plane with friction. The inclined plane has an angel 26 degrees with the horisontal. At a point the chuck has a velocity 4 m/s. The velocity after 2 seconds goes down to 2 m/s. The g is applied to 9.81 m/s^2.

    So from here I need to find the kinetic and static friction. The problem for me is that I dont know where to start. When I try do find Fx and Fy, I need the mass, so which way should I go through?

    Thanks! :)
     
  2. jcsd
  3. Apr 21, 2013 #2

    Doc Al

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    Staff: Mentor

    You won't need the actual mass. Just call it "m" and continue.

    What does the problem ask you to find? The coefficient of kinetic friction?
     
  4. Apr 21, 2013 #3
    The problem wants me to find the coefficient between the chuck and the inclined plane
     
  5. Apr 21, 2013 #4

    Doc Al

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    Good.

    (1) Figure out the acceleration.

    (2) Draw a free body diagram and then apply Newton's 2nd law.
     
  6. Apr 21, 2013 #5
  7. Apr 21, 2013 #6
  8. Apr 21, 2013 #7

    Doc Al

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    Redo your algebra. You dropped a factor of g.
     
  9. Apr 21, 2013 #8

    jambaugh

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    Gold Member

    salmacho,
    Please, when you get a chance, read the guidelines for posting homework questions and use the template.
    How to Ask for Help
     
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