Coefficient of Restitution vs Temperature EPI

[johnsmith123]

Hi guys,

I am trying to work out why hotter polymer balls will bounce better than cold ones.
i understand in the case of hollow balls, but a solid one I am stumped.
I have been reading about it and people are quoting things like it increases the balls elasticity, but can anyone actually explain why?
I know that this may not be relevant to VCE Physics but nonetheless any help is greatly appreciated.

[BigAl]

well if you make polymer hotter you make the length of bonding much larger..which increases elasticity...I cant fully answer your question though

[johnsmith123]

What do you mean length of bonding?

[BigAl]

http://en.wikipedia.org/wiki/Bond_length sorry for sloppy wording..have a look at here as well..http://en.wikipedia.org/wiki/Rubber_elasticity looks like elasticity is proportional to temperature.