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F<weight>=-ma .But if my acceleration is zero, does that mean i am not using any force to overcome the gravitational force(mg)?

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Since you are pressing against the Earth no force is needed to stay there, however if you were hovering a few feet off the ground and not moving you would need to counter the force of gravity with a force of, say, a propulsion pack.

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That's exactly what it sounds like to me...but I know nothing about all those formulas. :)

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