What's the use of seat belts on airplanes?

Wearing a seat belt is a necessary precaution. When an airplane flies at high altitude, it is not only affected by environmental factors, but also sometimes by the unfavorable factors produced by the airplane itself in motion. It is mainly manifested in the passive displacement of human body caused by acceleration change and the violent ups and downs caused by complex climate.

When an airplane suddenly encounters thrust or resistance in flight, its speed or direction changes, resulting in acceleration. When taking off, landing and turning sharply, the change of acceleration will cause human displacement. For example, if the plane lands too fast and the passengers don't fasten their seat belts, then the plane suddenly slows down and the passengers may be injured by leaning forward. When the plane turns sharply, because the centripetal acceleration is large, it is easy for unconstrained passengers to dump outward. Generally, the flight speed of passenger aircraft is above 500 km/h, that of Boeing can reach 900 km/h, and that of supersonic passenger aircraft Concorde can reach above 2000km.

/hour Even when taking off and landing, the speed is 200 km/h. If you suddenly brake in an emergency, the consequences will be very serious. For this reason, the passenger plane is equipped with seat belts, so that passengers can move synchronously with the passenger plane and avoid the harm of inertial force to passengers.

Another reason for using seat belts is the severe fluctuation caused by the complex climate when the passenger plane flies flat. In the atmosphere, complex weather changes greatly. Vortex airflow often moves up and down in the air to 1 10,000 meters, which is the height of a large jet airliner. Before each voyage, the crew must go to the airport meteorological room to learn about the weather forecast along the way. However, the weather is unpredictable. When a wide-body airliner flies at high altitude, it is often clear in Wan Li, so it is not easy for the naked eye to see the arrival of turbulence. It is this clear-sky turbulence that makes drivers hard to prevent and hurts their brains. These air currents have a certain speed, and their relative speed is greater with the cruising speed of passenger planes. The strong airflow will make the passenger plane rise at the speed of 10~ 15 meters per second, or it may make the passenger plane fall at a greater speed, which will destroy the normal flight and cause severe bumps. Just like when we fly kites, we can't fly kites when we encounter a whirlwind. When a passenger plane accidentally enters this turbulent area, there will always be problems of different degrees, from slight vibration to moderate bumps. In severe cases, the strong turbulence swirling up and down will throw passengers who are not wearing seat belts to the top of the cabin and then fall to the seat or floor, and its danger can be imagined.