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Mass not sliding on a smooth, accelerating base

  1. Jul 5, 2015 #1
    1. The problem statement, all variables and given/known data
    Mass m lays on the smooth triangle of mass M. what is the acceleration of M so that m will stay in place.

    2. Relevant equations
    Newton's second law: ##F=ma##

    3. The attempt at a solution
    $$\tan\alpha=\frac{ma}{mg}\;\rightarrow\; a=g\tan\alpha$$
     

    Attached Files:

  2. jcsd
  3. Jul 5, 2015 #2
    My suggestion is to determine the acceleration of the block if the ramp is not moving first, down the slope.
     
  4. Jul 5, 2015 #3

    Nathanael

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    Homework Helper

    Looks right to me, is your answer supposed to be wrong?
     
  5. Jul 5, 2015 #4
    It's one of the possible answers but the other answers are complicated and include M. it's logical that my answer is correct since it's a short quiz, not a long exam
     
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