What force keeps airplanes, birds, and insects in the sky? - The force that keeps airplanes, birds, and insects in the sky is lift., How do birds create lift with their wings? - Birds create lift with the shape of their wings, called an aerofoil shape., What is Bernoulli's principle and how does it relate to lift? - Bernoulli's principle states that as air moves faster over the top of the wing, the pressure is lower than under the wing, creating lift., According to Newton's third law of motion, what happens when the wing pushes down on the air below it? - When the wing pushes down on the air below it, the air pushes back up on the wing, creating lift., What are the factors that affect the amount of lift produced by wings? - The factors that affect the amount of lift produced by wings include the size of the wings, air speed, and density of the air., What is drag, and why do birds and airplanes try to reduce it? - Drag is a force that tries to slow down birds and airplanes, caused by parasitic drag and induced drag., What can happen if a bird or airplane experiences too much drag? - If a bird or airplane experiences too much drag, they may lose lift and start to fall, known as a stall.,

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