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Planes are affected by gravity but the shape of their wings creates lift and when there is enough lift it overcomes the effect of gravity. Lift is generated because of the fact that faster moving air will be at a lower pressure than slower moving air. The shape of the wing causes the air flowing over the top to have to go further to meet back up with air which went under the wing. It therefore had to go faster and was at lower pressure. The higher pressure air underneath them pushed the wing up. That is lift. The faster the air the more the lift. Once an aircraft is travelling fast enough down a runway it gets to a point where the air over the wings is producing so much lift it overcomes the weight of the plane - that us when it can take off

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15y ago

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