Force Density ??

Hi  Daniel, 

I have a quick question about the force density component in kangaroo 0.999. 

normally force density is length/force. so as an input you have targetforce ? how does this relate to classic forcedensity formulas?

or is the target force more an idea of a desired end force embeded in an element? kind of like saying what type of prestress you want in an element?

thank you for your time.

- Jens