it mean to say that something is 'conserved'? What is the difference between conservation of mechanical energy and conservation of energy in general?...
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 1/ What does it mean to say that something is "conserved"? What is the

difference between conservation of mechanical energy and conservation of energy in general? 

2/ If an object is moving on a surface with friction, the motion will generate thermal energy. Where does that thermal energy come from?  

  

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