I have tripped more than enough times and had some pretty crazy experiences dmt/lsd/shrooms/2ci/2cb/2ce/ketamine and never once felt like gravity was there been to burning man a few times too and tripped really hard in the middle of the desert and still nothing.I bet you can if you fall far enough. (Even tripping may make you get an accelerated sense of this gravity stuff..)
Maybe I need to grow my own shrooms and try again