Rubber bands expand when chilled and contract when heated (no stretching, just when heated/chilled and at rest) to my knowledge. Why are hot rubber bands able to be stretched longer than cold rubber bands when acted upon by the same force? For example, a hot rubber band will stretch 10 cm when a weight it pulling it down, but a cold rubber band will stretch 5 cm when the same weight is pulling it down. Is it because of entropy? Or potential energy? Is it Hooke's Law, where K-constant decreases if temperature increases?
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