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Because they have mechanical structures, powered by motors using the solar energy

stored in oil, that can push against air, thereby generating forces that can be directed

opposite to the force of gravity and work against it.

You might just as well ask: "When there is a gravitational force on the Earth, then

how can I walk up the stairs from the first floor to the second floor ?"

I would have answered: Because you have mechanical structures, made of bones

and powered by muscles using the solar energy stored in food, that can push against

the floor, thereby generating forces that can be directed opposite to the force of gravity

and work against it.

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Q: When their is a gravitational force on the earth then why does helicopters and aeroplanes do not fall while they are in the air?
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