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Homework Help: Newton laws of motion

  1. Sep 2, 2008 #1
    View attachment Cart drive right with acceleration of a.pdf


    what is the force work on object B in terms of a ?

    i know that the frictinon should be bigger than the force mBg for that the object will not fall down.
    but how to express it in terms of a ??

    TNX .
     
  2. jcsd
  3. Sep 3, 2008 #2

    PhanthomJay

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    If you are looking for the forces acting on B, you must draw a Free Body Diagram of that object, and identify all the forces acting on it, including its weight, the friction force, and the normal force between the 2 blocks. Use Newton's laws in the x and y direction to solve for the minimum acceleration required.
    It can't be bigger; for static equilibrium in the y direction, it must be the same.
     
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