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FBD, friction, force placement

  1. Mar 2, 2012 #1
    1. The problem statement, all variables and given/known data

    See attachment.

    2. Relevant equations

    3. The attempt at a solution

    My only question concerns the free body diagram. In the attachment, is the F pointing to the right friction or force of the truck accelerating? Why is the line of action of N not go through the mass center? And shouldn't friction for the cabinet point toward the left since a force is pulling it right?
    I'm very confused about this.
    Any help is appreciated thanks.

    Attached Files:

  2. jcsd
  3. Mar 3, 2012 #2


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    Science Advisor
    Homework Helper

    hi xzibition8612! :smile:

    the only horizontal force on the cabinet is the friction force :wink:
    see above :rolleyes:
    take moments about the point below the centre of mass …

    the centre of mass is accelerating, so there's a non-zero moment of acceleration about that point, which show that the normal force must also have a non-zero moment
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