When I'm learning about energy. There is a sentence leave me hang.
Energy cannot be created nor be destroyed
So, if energy cannot be created, so how can we have energy in this world in the first place?
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1Possibly related: http://physics.stackexchange.com/questions/3014/what-is-energy-where-did-it-come-from. – honeste_vivere May 05 '15 at 12:46
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I will be looking at it – Simon-Nail-It May 05 '15 at 12:48
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Look at the duplicate (and other related questions, e.g.: http://physics.stackexchange.com/q/138972/50583, http://physics.stackexchange.com/q/137601/50583, http://physics.stackexchange.com/q/145124/50583). All of the answer are essentially: It's a number. It doesn't "come" from anywhere. – ACuriousMind May 05 '15 at 15:16
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Cough. Energy isn't just a number. Matter is made from it. The mass of a body is a measure of its energy-content. – John Duffield May 05 '15 at 19:33