May 8th, 2011, 04:38 PM  #1 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0  Forceenergy equivalence 
May 8th, 2011, 06:23 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 462 Math Focus: Calculus/ODEs  Re: Forceenergy equivalence
Perhaps I'm wrong, as it's been a long time since I fiddled with special relativity, but I don't think we can use Newton's second law of motion in the form F = ma here. I think we need to use it in the form Newton actually gave it: I believe E = mc² is referred to as massenergy equivalence. 
May 8th, 2011, 08:01 PM  #3 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
Correct. Classical mechanics deals with motion of objects large enough, where relativity deals with objects moving very fast. Hence F/a ? E/c².


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