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Thread: SWaB: how do massless particles "feel" gravity

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    Default SWaB: how do massless particles "feel" gravity



    https://www.forbes.com/sites/startsw...Q#5a09ec421cd0

    The short story is that the equivalence principle guarantees all bodies experience the same acceleration regardless of their mass. But it's an amusing read anyway.
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    Default Re: SWaB: how do massless particles "feel" gravity

    Quote Originally Posted by not_Fritz_Argelander View Post
    The short story is that the equivalence principle guarantees all bodies experience the same acceleration regardless of their mass. But it's an amusing read anyway.
    I'm not trying to cute, it really just seems natural to ask (thinking of the possible corrolary):

    Does this mean that all bodies experience the same acceleration regardless of their energy?

    Joe
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    Default Re: SWaB: how do massless particles "feel" gravity

    Quote Originally Posted by BABOafrica View Post
    I'm not trying to cute, it really just seems natural to ask (thinking of the possible corrolary):

    Does this mean that all bodies experience the same acceleration regardless of their energy?

    Joe
    Yes. Just so. A simple way of seeing this is true is to look at the Newton formula: ma = GMm/r^2 where m is the mass of the body experiencing the gravitational pull of mass M. m cancels on both sides. so the acceleration is independent of the mass of the body: a = GM/r^2.
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