So I have been asking my self these questions lately. I know it is some basics of physics and I should probably know the answer.. Why do we feel weightlessness when we hit the acceleration of gravity (9.8) exactly? Probably so that the surface that we are standing on doesnt need to produce any normal force on us so we dont feel weight. For instance, The elevator.. When the acceleration is exactly at 9.8 downward then Mg - n = ma and by that n = 0 But how do normal force makes us feel our weight? that what I couldnt understand.