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Sphere: angle to begin sliding

  1. Oct 20, 2007 #1
    [SOLVED] Sphere: angle to begin sliding

    Given a small mass on a sphere. Coef of static friction is .49 what angle would begin sliding.

    I thought i would use inverse cos(.49/9.8) and i get 87 degrees but it is wrong any other equations i am missing?
     
  2. jcsd
  3. Oct 20, 2007 #2

    learningphysics

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    Suppose the mass is m. What is the normal force in terms of m, g, theta?

    What is the frictional force... and what is the force that is causing the object to slide...
     
  4. Oct 20, 2007 #3
    i think i figured it out i went and looked at some other equations and realized i needed to use tan instead of cos and i got the correct answer of 26.1 degrees Thank you for the tip.
     
  5. Oct 20, 2007 #4

    learningphysics

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    no prob. you're welcome.
     
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