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Thread: mass and the speed of light question

  1. #1 mass and the speed of light question 
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    Why is it that something gets heavier when it moves faster i.e. near the speed of light at least according to Einstien.


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  3. #2 Re: mass and the speed of light question 
    . DrRocket's Avatar
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    Quote Originally Posted by Topalk
    Why is it that something gets heavier when it moves faster i.e. near the speed of light at least according to Einstien.
    It is a consequence of special relativity which is a consequence of the fact that the speed of light does not vary with the speed of the source.

    Read up on special relativity.


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  4. #3  
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    As you get close to the speed of light, doubling the energy applied does not double the speed. You approach a limiting value, c , and even if you add large amounts of energy, you approach but never quite reach c. Now since mass/energy cannot be created/destroyed only changed from one to the other, all this extra energy which has no, or very little, effect on speed is changed to mass.
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