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Need help for question on Friction!

  1. Sep 13, 2014 #1
    1. The problem statement, all variables and given/known data

    Screen Shot 2014-09-14 at 11.59.20 AM.png

    So that is the question.

    2. Relevant equations

    The relevant equations I've used are:

    Ff=μN

    Ff=μkmgcosθ



    3. The attempt at a solution

    I don't even know what Ff is? I believe this question involves using toa, cah, soh, but i really am confused about how i should go about with it. :( Can somebody please help me?
     
  2. jcsd
  3. Sep 13, 2014 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    The problem statement provides a good deal more information than is required to answer the question. Can you identify the minimum data that is needed to answer the question?

    If you don't know what Ff is, then you had better refer to your class notes to learn what Ff is.
     
  4. Sep 13, 2014 #3

    Hi Daisy.Welcome to Physics forum.
    I have made a figure for you.Please have a look here. PPP@.png


    From this figure resolve mg on X and Y axis then use newton's second law in Y direction.
    And from formula Ff =μR you can find frictional force.
     
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