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Homework Help: Friction Problems

  1. Sep 27, 2005 #1

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    I managed to do most of the question(whether it's wrong or right), Figured out friction was 7.23N, and the box slides down with 9.64 N if the force is not applied... But what I'm confused on is, how do you use a Y component to cancel out the x component? (I mean if you draw a coordinate plane perpendicular to the incline, then the 9.64 is going straight down the x axis and the perpendicular froce being asked is going straight down the y axis)

    I figure if the load cant slide forward, the net force should be 0, therefore accerlation must be 0 too, but thats where I'm stuck...
     
  2. jcsd
  3. Sep 27, 2005 #2
    Force of friction is mu times the normal force. So if you increase the normal force, what happens to the force of friction?
     
  4. Sep 27, 2005 #3

    404

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    ahh right friction increases too, so thats how you cancel out the x component of gravity... Thanks, I'll go try it now.
     
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