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Re: Elastic potential energy

On page 175, we're talking about an "ideal spring"--one that follows
Hooke's "law", F = kx. We say "Real springs don't always obey (F =
kx) ...".

On Fri, 16 Nov 2001, Ludwik Kowalski wrote:

I have found a very unusual spring last year. The coils remain
in contact till the pulling F is about 6 N. Then the x=f(F) become
a straight line whose slope is about 50 N/m. Good for demos.
Ludwik Kowalski