Yes, but Me thinks they are linear and not the square of the displacement.
If you could have such a spring you might use a magnet to
increase the period of a vertical device to just about anything at all.

Regards,
geoff

-----Original Message----- 
From: Christopher Chapman
Sent: Tuesday, August 02, 2011 8:15 AM
To: psnlist@..............
Subject: Re: Springs and Gravity or Magnitism



Subject: Springs and Gravity or Magnitism


Is it possible to build or buy a spring which increases or decreases at the square of the distance instead of being linear ? Hi 
Goeoff, They are usually called leaf springs.Does this ring any bells?Regards,Chris

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