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Question:
How can birds fly when there is gravity and not be pulled down?



Replies:
Gravity produces a force which always pulls the birds down, toward the earth. To fly, the bird must make a force with its wings in the opposite direction, away from the earth. When the bird flaps its wings, the air moves around them in such a way that there is more force on the bottom of the wings than on the top. The force on the bottom of the wings pushes the bird up.



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