Gravity accelerates objects towards the center of the earth at 9.8 meters per second squared. When the plan goes into it’s dive it (and everyone inside it) is falling towards the earth and accelerating at 9.8 meters per second squared already. Since you’re already accelerating down as fast as the earths gravity can pull you, there’s no extra force left to hold you down in your seat.
It’s no accident that another description of zero gravity is “free fall”.
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