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

1. ## 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.

3. ## Re: SWaB: how do massless particles "feel" gravity

Originally Posted by not_Fritz_Argelander
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

4. ## Re: SWaB: how do massless particles "feel" gravity

Originally Posted by BABOafrica
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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