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$\begingroup$ Yet photons feel the force of gravity; $F=ma$ isn't always the case. $\endgroup$
– HDE 226868
Commented Jan 14, 2015 at 0:12
$\begingroup$ Classical $F=ma$ equation doesn't work for massless particles — they are ultrarelativistic in all cases. $\endgroup$
– Ruslan
Commented Mar 18, 2015 at 12:02
$\begingroup$ But this answer is smart and funny argument :) $\endgroup$
– kakaz
Commented Jun 10, 2019 at 12:54

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