Physics

The key is recognizing that net force determines acceleration—when thrust drops below the weight force, the quadcopter stops hovering and accelerates downward. Use Newton's second law ($F_{\text{net}} = ma$) by finding the vector sum of all vertical forces: the reduced upward thrust and the downward gravitational force. The direction and magnitude of the net force will tell you both which way the quadcopter accelerates and how quickly.

The key is recognizing that net force determines acceleration—when thrust drops below the weight force, the quadcopter stops hovering and accelerates downward. Use Newton's second law ($F_{\text{net}} = ma$) by finding the vector sum of all vertical forces: the reduced upward thrust and the downward gravitational force. The direction and magnitude of the net force will tell you both which way the quadcopter accelerates and how quickly.