Amazing thing about rubber bands and heat?

My friend told me something about stretching rubber bands and how they give off heat. Something he learned about in chemistry class.

It was something supposed to be amazing but his cell phone died before he could tell me the rest and I am still intrigued.. does anyone know what he may have been trying to describe to me?

thanks!

Answer:
When rubber is heated, it shrinks.
(Most things expand when they are heated.)

Does that mean that rubber gives off heat when it is stretched (i.e., when you expand it)?
I think this boils down to friction. If you stretch the rubber band repeatedly it will warm. This can also be done with a thick sheet of plastic and a thin sheet of metal. If you bend these over and over, you can feel warmth in the crease where the bend occurs.

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