Ka! Why does the seat belt suddenly fail to pull? After reading these pictures, I can't stop wearing them

In this paper, from ： Nanjing traffic police “ The first thing to do when you get on the bus is to fasten your seat belt ” that , Have you ever felt this way when you pull your seat belt , Just hear “ Kaka ” The seat belt suddenly jammed with a sound ！ live ！ 了 ！ If you pull hard, you won't move

Not because you're fat ！

It's you pushing too hard ！

Car seat belts are “ Eat soft but not hard ” Yo!

Everyone knows that if you move slowly when wearing your seat belt , The seat belt can be pulled, but if you pull the seat belt at a very fast speed, it will lock immediately and can't be pulled. In fact , This is the principle of car safety belt