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Bernoulli’s Principle Many times I have found myself watching a baseball game and wondering, “Why does the ball curve?” I have also questioned why airplanes can fly; now I know. An eighteenth century scientist, named Daniel Bernoulli, devised Bernoulli’s Principle. He discovered that as the speed of a fluid increases, the pressure decreases. A fluid can be either a liquid or a gas, such as air. This is why airplane wings are designed flat on the bottom, and curved across the top. The air going over the top of the wing must move much faster to keep up with the air beneath the wing. Thus, the pressure above the wing is lower, so the airplane takes flight. This is how airplanes are able to fly. I have observed that when driving, semi-trucks seem to pull my car towards them. This is due to Bernoulli’s Principle. The air trapped between our vehicles is moving so fast, that it decreases the pressure enough to attract my car to the semi. I have learned that riding behind a semi is a way to save gas. I can put my car in neutral and allow the semi’s air pressure power my motio