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May 8th, 2011, 04:38 PM   #1
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Force-energy equivalence

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May 8th, 2011, 06:23 PM   #2
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Re: Force-energy 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 = mc is referred to as mass-energy equivalence.
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May 8th, 2011, 08:01 PM   #3
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Correct. Classical mechanics deals with motion of objects large enough, where relativity deals with objects moving very fast. Hence F/a ? E/c.
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