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What is meant by drag can be both postive and negative force?


Drag is the force of flight that slows down things that fly. When drag is termed "positive", that means that it is exerting a force against the force of thrust. Negative drag means the opposite, that there is a reduction in the drag force. When drag is positive, we can assume the aircraft is slowing down. When drag is negative, we can assume it is accelerating.

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Categories: Forces of Flight