Drag is a force opposing thrust. It attempts to pull the aircraft back in flight. When airflow is disrupted over an area it produces drag. All moving objects that move through air or water create drag, the bigger they are the more drag they produce. Scientists have been working on reducing drag as aircraft get bigger and faster. One way they found to reduce drag is to streamline the aircraft. The object of streamlining is to reduce the amount of air that has to be moved in order for the aircraft to pass through a column of air.
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