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How does one do this question?

  1. Nov 20, 2012 #1
    Figure attached below. You have a big block of mass M and a small block of mass m. When m=3kg, the acceleration of the large block is 0.6ms-2. When m=4kg, the acceleration of the large block is 1.6ms-2. The dynamic friction coefficient between the large block and the surface it slides on is μ. There is no friction between any other surface. Questions:

    a) Express the relationship between the movement of block m and block M
    b) Derive expressions for the motion of block m and block M.
    c) Determine the mass of block M and the dynamic friction coefficient, μ, between it and the surface it slides on.

    [​IMG]
     
    Last edited: Nov 20, 2012
  2. jcsd
  3. Nov 20, 2012 #2

    jbriggs444

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    Nice problem. So what have you got so far? How does the motion of mass m relate to the motion of mass M?
     
  4. Nov 20, 2012 #3
    I know that [itex] x_m = 2 x_M [/itex], so that the small block moves two times as much as the big block. My problem is decomposing the forces.
     
  5. Nov 20, 2012 #4

    SteamKing

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    Draw free body diagrams. Start with the mass m. What forces are acting on m?
     
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