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Homework Help: 2 masses on an inclined plane, one unknown mass needs to be found

  1. Dec 21, 2009 #1
    1. The problem statement, all variables and given/known data
    see attached diagram, one mass is given at 10 kg while the other is unknown. The friction is given an (mu)=0.25 for both masses

    2. Relevant equations
    i need to find Magnitude of M for when the 10KG Mass slides down the plane and again for when the 10KG mass slides up the plane

    3. The attempt at a solution
    on the 10kg mass

    I don't know where to go from here, I am really stuck with this can anyone help please?

    On the Unknown Mass

    Attached Files:

  2. jcsd
  3. Dec 21, 2009 #2


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    Homework Helper

    It would be appreciated if you didn't post diagrams as MS Word files. There's a whole list of image formats which are much better for this sort of thing.

    From your diagram (at least, as well as I can make out - it came through rather distorted), I can't see what the unknown mass M has to do with anything. Is there some information in the problem you're not telling us? Are the two masses connected by a string, perhaps?

    Also, when you calculate the components of the gravitational force, make sure you have the correct units. (You don't in the post above)
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