Date: Tue, 21 May 2002 16:02:23 -0500

Author: (Karl Trappe)

Subject: RE: Cenco Spring


The narrow end has a slightly greater k value for its stiffness due to the
tighter spiral. This means it can support more weight per delta y
elongation than the more openly wound end. Hopefully, this difference in
the k value, as you go along the length of the spring, is just enought to
compensate for the "extra weight" of the next turn of the coil immediately
below it, then the next 2 turns, then the next 3 turns, and so on, until
you reach the top. Karl

>We have some springs like these and our lab manual tells the students to
>hang them
>with the narrow end up. Why?
>I know the freq. will be slightly different the other way, but is there
>any reason to
>choose narrow end up rather than narrow end down?

Dr. Karl I. Trappe Desk (512) 471-4152
Lecture Demonstration Office Office (512) 471-5411
Physics Department, Mail Stop C-1600 Home (512) 264-1616
The University of Texas at Austin
Austin, Texas 78712-1081