Free-Body Diagrams: Solving for Tension and Weight

[unscientific]

free-body diagram (urgent)

I was wondering how to draw a free body diagram, could u see if this is correct? A body of weight W was pulled along a rough surface, with a string and applied tension T, which one of the following diagrams is correct? N is normal contact force.

 

[PhanthomJay]

Sometimes objects are treated as particles, and at other times, objects are considered to have dimensions. So 2 of the three could be correct, depending on whether you consider the object to have dimensions. For the latter case, you'll need to sum torques about the lower right hand corner of the box to check stability and compatability with rotational equilibrium.