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Homework Help: Mechanics inclined plane question

  1. Apr 2, 2013 #1
    1. The problem statement, all variables and given/known data
    A small object of mass m is given an initial velocity u at point A. Just after it passes B the reaction force between the object and the surface drops at half the previous value. If the coefficient of friction between the object and the surface is μ=0.3, find the initial velocity u.
    ω0 =10rad/s
    Ans: 2.46 m/s

    2. Relevant equations
    F = μR
    Possibly SUVAT equations???

    3. The attempt at a solution

    Attached Files:

    Last edited: Apr 2, 2013
  2. jcsd
  3. Apr 4, 2013 #2


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    Science Advisor
    Homework Helper
    Gold Member

    It's traditional for you to show you have made some attempt at the question.

    Why does the normal force after point B drop?
    What's the definition of μ?
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