Figure 6.3 
Concurrent forces and non-concurrent forces. (a) The lines of action of concurrent forces pass through a common point. (b) The lines of action of non-concurrent forces do not intersect at a common point.
-Three forces are acting on objects as shown in Fig. 6.3. The vector sum of the forces is zero. Explain if there is any difference between the two cases: (a) the lines of action of concurrent forces pass through a common point, and (b) the lines of action of non-concurrent forces do not intersect at a common point. Are any of the two objects moving? Why or why not? If there were motion, what kind of motion would it be?
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