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Quick Question Regarding Smooth Inclined Plan

  1. Feb 22, 2013 #1
    1. The problem statement, all variables and given/known data
    an block of mass 6kg is sliding down an inclined plane inclined at 45° to the horizontal. Find the acceleration of the mass.

    2. Relevant equations

    3. The attempt at a solution
    Is it correct that the weight times sin45 will equal ma, because thats how i first did it but now I am going through the problem again before handing it in and drew the sketch again and I was thinking what about the weight times cos45? wouldnt that AND wsin45 cause acceleration?
  2. jcsd
  3. Feb 22, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Only the component of the weight parallel to the incline (mg sinθ) acts to accelerate the block. Perpendicular to the incline, the normal force acts to cancel the component of the weight (mg cosθ).
  4. Feb 22, 2013 #3
    Thanks :)
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