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Block at rest on slope

  1. Dec 16, 2014 #1
    1. The problem statement, all variables and given/known data
    A block is at rest on a rough incline .
    The frictional force acting on the block, along the incline, is
    A) greater than the weight of the block.
    B) equal to the weight of the block.
    C) zero.
    D) less than the weight of the block.

    2. Relevant equations


    3. The attempt at a solution

    The frictional force should be equal to the Weight along the slope so MG/sin(theta) so shouldn't the frictional force be greater than the weight of the block?
     
  2. jcsd
  3. Dec 16, 2014 #2

    Nathanael

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    Homework Helper

    The weight along the slope is greater than the total weight?

    How do you get MG/sin(theta)? That would imply, as the angle theta goes to zero, the weight along the slope goes to infinity. Is that reasonable?
     
  4. Dec 16, 2014 #3
    I know i'm doing something wrong but i don't know what
     

    Attached Files:

  5. Dec 17, 2014 #4
    Nvm I got it I was decomposing my gravitational force vector incorrectly
     
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