>>4718089 (lb)

Common sense…ok…lets try a experiment…

Find a carousel (the ones with the horse would be fine)…

As the carousel is turning…jump up and down (same as your balloon theory, going up and down).

you are still in the same place…but the carousel has been turning the whole time.

why didn't you move based on outside the carousel…hmm…figure that out and come back and post that the earth is round…ok, pumpkin!!!!