Posted by Kate on Wednesday, January 6, 2010 at 8:37pm.
It depends on the context.
If you are working on a problem where there are 9 forces on one mass, then you would put
Σ Fi= ma
and put i=1 at the bottom and 9 at the top.
If this is a general equation to indicate that the forces acting on the mass must be summed together, then no indication of the limits is required.
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