If you pitch the plane up and have plenty of engine power-the plane climbs and the airflow remaines pretty much parallel to the wing . . . . but if you pitch the plane up without enough power applied-you get into a vicious circle where the wing loses lift-you start to fall downwards-which means that the airflow is now somewhat upwards-which further increases the angle of pitch to the airflow-which increases the drag-which slows you down-and the pitch angle to the airflow increases still further-until you're simply falling like a rock.
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