Aircraft pitch forward into freefall after encountering a stall because of the way that lift is generated. The wings of an aircraft are shaped so that when air flows over them, it creates lift. However, if the airflow is disrupted, as can happen during a stall, the wings can no longer generate lift and the aircraft will fall. The horizontal and vertical stabilizers add weight to the back of the aircraft, but they also help to keep the airflow smooth so that the wings can continue to generate lift even in turbulence.
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