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when you rub two objects together heat is generated and when you stop heat is lost. what is the reason for this?

when you rub two objects together heat is generated and when you stop heat is lost. what is the reason for this?

Homework Statement Rub the two books together for a long time, so that the thermometer goes all the way up to the top and all the extra molecules fly off the top book. Keep the books touching, but stop rubbing. The temperature will go down. How can you tell? List two different ways...