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Homework Help: An Incline with a Block on it is Accelerated

  1. Nov 3, 2008 #1
    1. The problem statement, all variables and given/known data
    Lets set up the Coordinate system. Y up is Positive, X right is Positive.
    g is directed Downward

    The Incline with 45 Degree corners Accelerates in the Positive X Direction with an Acceleration A. What is the Acceleration of the Block.

    Answer Clue: When A = 3g Y(Second Derivative) = g

    2. Relevant equations
    Just sums of Forces.

    3. The attempt at a solution

    I attempted to Break down the Accelerations (I ignored Forces, because the mass of the Block is Irrelevant)

    I got the equation Sin(45)A - Sin(45)g should be the acceleration (I projected A and G onto the Incline), but this does not work with the answer clue. Where should I try next?
  2. jcsd
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