Simply put, the flight of a paper plane is formed by the interaction of gravity and lift. The weight of the paper plane itself will drag the fuselage down, and the wings will catch the air and let the paper plane float in the air. Coupled with the "power" of the thrower to help the paper plane slide forward, it will slide out by inertia, and the balance of the three forces will make it fly out in a beautiful posture.

How does a real plane fly? A real airplane will be affected by gravity, lift, thrust and drag. Gravity refers to gravity, thrust refers to airflow thrust generated by aircraft turbine, and resistance refers to the force that air affects aircraft flight. Therefore, when the thrust and lift of the airflow generated by the aircraft turbine are greater than the gravity and resistance of the earth, the aircraft naturally soars in the sky.