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Homework Help: Kinetics in Nromal and Tangential coordinates - SPINING ROD W/ SPOOL

  1. Jun 18, 2006 #1
    Kinetics in Nromal and Tangential coordinates - SPINNING ROD W/ SPOOL

    The 2-kg spool fits loosely on the inclined rod for which the coefficient of static friction is [itex]\mu_s\,=\,0.2[/itex]. If the spool is located 0.25 m from A, determine the maximum speed the spool can have so that it does not slip up the rod.

    http://img207.imageshack.us/img207/6962/problem13770pa.jpg [Broken]

    Here is what I have for this problem, but it is wrong according to the answer in the text:







    Then I use another version of the [itex]F_x[/itex] equation to solve for [itex]v_{max}[/itex]:




    The answer is 1.48 in the text though! Any suggestions?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Jun 18, 2006 #2

    Doc Al

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    Staff: Mentor

    What's the direction of the friction force on the spool?
  4. Jun 18, 2006 #3
    Down the rod towards point A, right?
  5. Jun 19, 2006 #4

    Doc Al

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    Staff: Mentor

    Exactly. Now revise your equations accordingly.
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