Well bands are a mostly linear material. So the force applied by the band is approximated pretty well by:
F=k*x
F=force generated by the band
k=constant of elasticty (varies band to band)
x= displacement or (amount of stretch in the band)
The place where you bought bands should have some sort of rating for them (generally they would give the k constant). So something like k = 5lbs/in or something. Or it might be 60lbs/ft. Same diff. Or it could be metric.
Whatever the units, make sure you are using the same units of displacement.
Thats all I got for ya.
I-Dub
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