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	Podcast:		4. Chemistry and Physics
	Episode:		Friction
	Category:		Science & Medicine
	Duration:		00:01:01
	Publish Date:		2011-07-13 19:48:38
	Description:		Transcript: Friction is a form of thermal energy. A hundred and fifty years ago U.S. cannon maker Count Rumford noticed that when he was boring out the barrel of a cannon a lot of heat was generated, but there wasn’t a fixed amount of heat contained in the metal of the cannon, because as he used his tools continuously more and more heat was generated. The blunter tools produced more heat than sharper tools. This turns into the concept of friction, a form of thermal energy where abrasion or rubbing or physical contact between two surfaces creates increased microscopic motions of the atoms or molecules in that surface, a form of heat energy. When you rub your hands together you are increasing the motions of the molecules in the skin of your hands and creating heat. Even two ice cubes when rubbed together will create heat.
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