Understanding Newton's Third Law requires more than just knowing its literal wording; it's about experiencing the reciprocity of forces and the process of establishing dynamic equilibrium. Designing this process as an interactive experiment where participants continuously input force (turning a handwheel) to drive the system and observe the system's sudden change in state (takeoff) after reaching a certain "critical point" greatly deepens understanding. The participant's physical exertion is directly converted into the propeller's kinetic energy, which in turn generates a force on the air. Whether the air's reaction force can overcome gravity depends on whether the magnitude of the previous force reaches a "threshold." This experience of "input-accumulation-threshold-sudden change" allows learners to personally experience that the interaction of forces is not static but seeks balance dynamically, and the breaking and establishment of this balance often depends on a slight exceedance of
