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Homework Help: Finding angle with just static friction coefficient

  1. Aug 16, 2011 #1
    1. The problem statement, all variables and given/known data

    m = 10kg
    static friction coefficient (Us) = 0.4
    angle = ?

    2. Relevant equations

    If the coefficient of static friction is 0.4, calculate the angle at which the box begins to slide down the plank as it tilts.

    3. The attempt at a solution

    m = 10kg
    Us = 0.4
    angle = ?


    Us = tanΘ

    0.4 = tanΘ

    Θ= tan-1 0.4
    Θ= 21.8

    Is what I did correct? Thank you for feedback
  2. jcsd
  3. Aug 16, 2011 #2


    User Avatar
    Homework Helper

    That is correct
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