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There are many theories currently out there that explain lift. The two more common theories of lift involve Bernoulli's theorem and Newtons Third law of motion.

Bernoulli's theorem states that if the velocity of a fluid increases the pressure decreases (note: air is classed and looked at as a liquid in fluid mechanics which is used to explains Bernoulli's theorem's streamlines of airflow running over the wing are forced upwards and closer together causing an increase of airspeed over the wing. This results in a decrease in pressure above the wing in relation to the air under the wing. The second law of Thermodynamics states in simple terms that areas of high pressure will go to areas of low pressure to equal out the imbalance. This results in an upwards push of air lifting the wing with it. This is the cause of more than 95% of lift on an aircraft.

The second way lift is produced by the wings has got to do with Newtons third law of Motion. The air that flows over the wing is eventually angled downwards slightly as it leaves the wing surface. This downwards force of air pushes back in the opposite direction (upwards) on the aircraft also helping with the production of lift. Additional to this (if you look closely) you will see that the wing is attached to the body of the aircraft on a slight angle. As the airflow hits the wing some of this is angled straight down and once again the force of the downwards air pushes back on the wing in an upwards direction with equal and opposite force. This final method is additionally seen when an aircraft tilts back to climb. More surface of the wing is exposed directly to the airflow causing more air to be pushed downwards increasing the overall force created by this method.

Hopefully this isn't too complicated and if you want a better explanation or links to useful resources feel free to send me a message.

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Q: How can the lift that enables an airplane to fly be explained?
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