How does the air around a bird's wing cause lift?
When a bird is just gliding, it moves forward through the air, with its wings held in a fixed position. The wings are at a slight angle, so they deflect the air gently downward. Pushing the air downward causes a reaction force in the opposite direction. You will notice a reaction force, any time you push against anything! The reaction force is called lift. ChaCha On!
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