Paratroopers need to use parachutes to slow down when jumping from the sky, so as to reduce the impact when landing, so that people will be less impacted when landing and will not hurt themselves. If someone wants to jump from the upstairs, it is not easy to change his momentum when landing, but an inflatable cushion can be placed on the ground to increase his contact time with the cushion, which can reduce his impact and protect him.
People are in the elevator. If the elevator falls freely because of an accident, the people inside are even more dangerous. The reason is that people's impact when landing is relatively large, and there is no life-saving cushion to reduce the impact when landing. Many people will think: can a person suddenly jump up to protect himself when the elevator lands?
Theoretically, jumping up before the elevator hits the ground can protect yourself a little, but it doesn't have much effect. The purpose of people's upward take-off is to reduce their speed relative to the ground, but the speed that people can get is too small. The average person's center of gravity can only be increased by tens of centimeters when taking off vertically on the ground. According to the calculation of 50 cm, the speed that people can get is about 3 meters per second.
Suppose the elevator falls freely from a height of 5 meters. If you jump up in the elevator, you will realize that it is not easy to jump up at this time, because you are already in weightlessness. Suppose you can grab the handrail in the elevator and let your legs jump up hard, the speed you can get will definitely be less than the speed you can get on the ground. Assuming that the speed you can get is 1m/s and the speed you can get when the elevator falls freely from 5m is 10m/s, you can change your speed relative to the ground from 10m/s to 9m/s by jumping. Decreasing the speed 10% means that the impact on the ground will be reduced 10%, which may make people not injured.
Jumping from a height of 5 meters may hurt, but jumping from a height of 4 meters may not hurt. It is still useful to watch people take off before the elevator falls to the ground from here. If the descending height of the elevator increases, the situation will change.
Assuming that the elevator falls freely from a height of 20 meters, the speed obtained when the elevator lands is about 20 meters per second. Falling at a speed of 20 meters per second is very harmful to people and is very likely to die. Before the elevator lands, jumping up at most reduces the speed of people relative to the ground from 20 meters per second to 19 meters per second. At this time, the impact force is only reduced by 5% compared with that without jumping up, and the impact force becomes smaller. This change is not as easy to protect yourself as maintaining a good posture.
If the elevator inevitably falls, the key is to reduce the impact on yourself. You can increase the buffer distance by standing with your knees slightly bent, which not only protects your knees and internal organs, but also reduces the impact, which is much better than blind take-off.
Theoretically, if you can jump at the moment when the elevator lands, you won't be killed or even seriously injured, but only if you can jump.
The elevator descended rapidly, resulting in great acceleration and inertia, and finally fell to the bottom and collided. The force of this collision is quite great, which is similar to that of a person falling directly from dozens of floors to the ground. Therefore, if a person falls rapidly in the elevator at this time, it is almost impossible to survive.
Some people say that if the elevator lands at this moment, if you jump up, you won't be knocked down when the elevator collides with the ground, then can you survive?
In theory, this truth is feasible. At the moment when the elevator is about to hit the ground, if we have enough power to generate an upward acceleration and break through the downward acceleration of the elevator, then we can jump up, be in a mid-air position at the moment when the elevator hits the ground, and then fall, so that the impact of falling is about half a meter, so that people will not die or even be seriously injured.
However, this is only theoretical. In fact, in a high-speed descending elevator, the downward acceleration is very large, and the speed may reach 20 meters. The acceleration generated by the power of human jumping is at most 5 meters per second, which cannot break through the descending speed of the elevator. The final result is that although they are struggling to jump, they can't jump, and finally they can only fall with the elevator, and they will be seriously injured or killed.
However, this jumping self-protection method may be successful in one case, that is, first of all, people should have enough explosive power, the kind who wants to exercise, and have strong strength as the foundation, and then there will be handrails and the like in the elevator. So, at the moment when the elevator is about to descend, this person will use enough explosive force and exert his hands and feet at the same time, and combine the upward force with the upward thrust of the handrail and the pedal force of the foot. But for ordinary people, this method is impossible, so don't expect to save yourself by this method.
In the process of rapid descent of the elevator, the correct way for ordinary people to save themselves is to lean against the wall of the elevator and then bend their knees to make an action similar to going to the toilet. Because people's joints still have great endurance and have a certain buffering effect, bending the knees can buffer some strength and reduce injuries. Backing against the elevator helps to protect the spine from injury and avoid secondary injuries caused by falling.
Of course, if you have enough time during the elevator descent, or you can keep calm enough, it is also a way to save yourself. Because we don't know whether the brakes of the elevator are completely damaged, we should turn on all the lights. If the elevator suddenly stops at a certain floor, we can get out of the elevator in time to be saved, even if the elevator door doesn't open, as long as the elevator has a buffer, even if we continue.
In short, if you encounter elevator failure in the elevator, don't panic and take appropriate self-help measures in time. In addition, if the elevator has stopped descending, but you can't open the door, don't try to open the door yourself. If the door is open and the front is not the exit, don't get in and out of the elevator by yourself, because this may lead to very serious consequences. Once you step on the air and fall into the elevator shaft, your life may be in danger. At this time, you should press the call button of the elevator in time.
PS: (The characters in the text are regarded as aliases, please feel free to read)
Li Yan, who just got up at six in the morning, stretched lazily. She opened her confused eyes, picked up her mobile phone and looked at the time. Suddenly she found herself late!
This fact frighten Li Yan a tingle, hurriedly sat up, just get up confused strength also instantly dispersed, Li Yan quickly got up, while wearing clothes mouth muttered:
Shit! Shit! We're gonna be late! Oh, my God! What can I do? After speaking, Li Yan has finished washing, put on her clothes in a hurry and ran to the elevator.
As soon as Li Yan got out of the elevator door, she met Aunt Wang who had just returned from outside. When Aunt Wang saw Li Yan running out in a hurry, she couldn't help laughing and asked, Hey, what's the matter? In such a hurry?
Li Yan looked up and saw that it was Aunt Wang who often took care of herself. She smiled and responded: Aunt Wang, I am in a hurry to go to work. We'll talk after I have a rest!
Li Yan said, and trotted out of Aunt Wang's sight. Aunt Wang smiled and shook her head, turned around and took out the key to open the door for her.
Li Yan trotted to the elevator door. After she pressed the elevator, she watched the elevator indicator light beating slowly. She quickly breathed a sigh of relief and the anxious expression on her face disappeared.
The elevator door slowly opened. As soon as Li Yan entered the elevator, she pressed the first floor directly with her mobile phone, and then Li Yan clicked the close button.
Then Li Yan took a step back and began to brush her mobile phone. The elevator slowly descended to the 35th floor, and watched the indicator number drop from the 35th floor to the 32nd floor.
Li Yan looked up at the elevator monitor. Seeing that the elevator indicator light is slowly descending, it seems that there is no problem, but Li Yan feels a bad feeling!
It is this feeling that makes Li Yan fidgety. She doesn't understand what's wrong, but there is always a sense of unease.
Li Yan began to observe the elevator indicator light carefully. When she watched the elevator indicator descend rapidly from the 32nd floor to the 22nd floor, Li Yan instantly understood why she felt so uneasy.
Li Yan quickly pressed the elevator alarm and exclaimed in her heart: This is not right, the elevator is falling too fast! I usually take the elevator, it can't be so fast!
After Li Yan pressed the alarm for five seconds, she found that the elevator descended faster and faster, and in just five seconds it dropped from the 22nd floor to the18th floor!
At this moment, Li Yan suddenly remembered what she had learned before. How to save yourself when the elevator breaks down rapidly? Li Yan immediately started to save herself according to the method.
Li Yan quickly chose to quickly press all the buttons under the elevator on 18 floor. When all the button lights of the elevator are on, the elevator still does not stop and continues to descend at high speed!
The anxious expression on Li Yan's face began to panic, but Li Yan didn't give up saving herself. She looked up at the elevator indicator and quickly descended to 16 floor!
While quickly lighting up all the floors below the elevator, I hope to stop the out-of-control elevator, but the descending speed of the elevator still can't stop!
Li Yan looked up at the elevator indicator light, pondered how much time there was, and pressed her finger on the elevator floor!
Just after Li Yan turned on all the buttons, she then pressed the elevator alarm and saw that the elevator had not stopped descending. At this time, Li Yan has begun to feel a little desperate!
Just when Li Yan was desperate to cry, the elevator finally stopped at 12 floor under Li Yan's operation, and then the elevator door began to open slowly!
Li Yan saw that the elevator door had been opened and ran out of the elevator quickly. Then Li Yan continued to press the elevator alarm in the corridor. After the elevator door is closed, it turns from falling to rising.
The subsequent scene made many people's backs cold. It is clearly seen in the surveillance video that when the elevator indicator light was displayed on the 13 floor, a burst of blue smoke suddenly appeared!
Then bang, the elevator fell rapidly and the elevator door broke with the naked eye! Now this elevator is under maintenance!
Fortunately, Li Yan was not in any danger, and when everyone was admiring her textbook-style self-help, I also found out why Li Yan was able to save herself successfully.
① When the elevator falls out of control, the most important first step to save yourself is to calm down!
It took Li Yan less than two minutes to save herself from danger, but under such a dangerous situation, Li Yan's success in saving herself depended on her calmness!
Many times, in many cases of self-help failure, the main reason for failure is panic! And how to calm down quickly in the face of sudden danger?
In fact, when our mood changes quickly, we can't ask others for help and need to save ourselves urgently, we need to breathe from the beginning.
In order to get more oxygen in the body, let brain waves recover quickly and smoothly, and then relax the body quickly to achieve the purpose of rapid cooling.
If deep breathing is not enough to calm us down quickly, we can't just look at the immediate danger when it is about to happen!
If you just look at the danger wholeheartedly, you will be full of anxiety and unable to calm down quickly and think about how to protect yourself!
So at this time, we need to divert our attention instantly. At this time, we immediately silently counted in our hearts, and we have reached the point where we quickly calmed down!
②: The elevator broke down and dropped rapidly. Is it useful to press all the elevator buttons quickly?
We can see whether the accident in this case is an obvious elevator sliding accident or a so-called elevator sliding accident.
It shows that the elevator system has a short-term fault during operation, and there is no way to locate it independently, and it is impossible to identify the floor that passengers in the elevator car want to go to!
At this time, if we choose to press all elevators on all floors, the elevator system will have a certain chance to start the elevator stop procedure on all floors.
When all the buttons in the elevator can be lit, it means that there is nothing wrong with the hardware of the elevator itself, and all the sliding accidents are just problems with the system in the elevator.
Then the point is, if we have a slide accident in the elevator, can we light all the elevator buttons like Ms. Li Yan in the case? Have we saved ourselves?
In fact, this method is very unreliable. After consulting a lot of information, I found that there are masters who specialize in elevator maintenance to popularize the logic of elevator operation!
According to professionals, the elevator car is pulled by wire rope. The greater the load of the elevator, the more wire rope structures there are.
Theoretically, one wire rope can pull the elevator car, but usually an elevator has six wire ropes, so even if one wire rope breaks.
There will be five left to ensure the safety of the elevator car, and the probability of all the wire ropes breaking is very small, which is not as fragile as everyone thinks.
Therefore, if the elevator suddenly falls, the elevator button will also fail due to power failure or other reasons, and when the elevator button can be lit, this means that the elevator safety can be guaranteed! Basically, there will be no big problems!
So when the elevator breaks down and drops rapidly, will you die if you jump at the moment you reach the ground? My answer is that this method can't guarantee your own safety!
The specific reason is very simple, this question is easy to answer, but when asking this question, it is obviously wishful thinking!
The first point: the moment the elevator quickly leaves the ground, you jump up! In fact, you didn't jump up, you just widened the distance from the bottom of the elevator.
And this little spacing is impossible to achieve the purpose of buffering, and it is impossible for you to escape successfully!
In addition, after a few seconds or more, your falling acceleration has reached several G's to10 g 's. If you jump with all your strength under this weight and resistance, you will only reduce the damage of a few G's! It has little effect on your ending!
The second point: this question also has the most important premise, that is, you need to choose when to jump!
If we can really jump up in a slide accident, you should also consider that if you don't jump fast enough, you will fall to your death at an ultra-fast speed when you land, and if you jump fast enough, you will also hit the elevator ceiling.
Of course, some friends will ask: If I dance properly, can I save myself by doing so?
And my answer is: no!
As for the reason, it is actually very simple. When we jump up, there will be an acceleration, which is the acceleration. It will act on you when you jump.
Can you imagine the consequences of a sudden acceleration on a fragile human body?
That's the acceleration when you jump, which will make your internal organs come out directly from your body!
There is a more important condition, in fact, when the elevator descends, you can't jump! Because when you fall freely with the elevator.
You just suffered from gravity! So how do you jump when gravity is not supported on the ground?
Final summary:
Therefore, when the elevator breaks down rapidly, jumping to the ground will definitely kill you! Immortality will also die for various reasons!
According to the expert's suggestion, if the elevator is about to descend to the bottom, we can take it in the elevator without handrails.
Choose to hold your neck with your hands to avoid neck injury in advance, and then you need to bend your knees. In human body, ligament is the most elastic tissue in our body, and you can bear some heavy pressure with the help of knee bending.
But every elevator has a safety valve, which will be physically stuck when it descends quickly, so after the elevator accident.
The most important thing for us is to keep calm, press the alarm, contact the maintenance personnel for help as soon as possible, and never open the elevator door yourself, because after the elevator door has problems.
You may not know the specific floor, and you may fall off the ladder if you are not careful!
All elevator manufacturers can install springs on the bottom floor of the elevator and dry silk chains on it, so that they will not land when they land. The dry silk chain doesn't need to be too long, just a little shorter when landing. So there's no danger. It won't hit the ground anyway. This is my personal suggestion.
If the elevator is one foot above the ground:
Probably won't die.
The top of the elevator is slightly higher:
Jumpers kill themselves without knives!
Yes, I can't grasp the time and die even worse; At least seriously injured. Squat and stand, stand flexibly, at least the five internal organs will not be injured; Can save a life.
The elevator descended at high speed. People will lose weight. In weightlessness, people's heart and blood pressure will lose balance. Heavy death.
Many times, we often subconsciously look at problems from the perspective of God, but it is difficult to experience a problem personally. As a result, we often measure problems through the experience in life, the so-called "empiricism" or "fixed thinking"!
For example, elevator failure, of course, we will not, dare not, and rarely have the opportunity to experience the feeling of elevator failure. Actually, it's nothing special. Theoretically, if the elevator breaks down on the 20th floor, it is no different from jumping off the 20th floor! Here, don't argue that the elevator has friction, and the bottom of the elevator has various buffering effects. This argument is meaningless, no more discussion!
We only discuss the situation that the elevator is supposed to fall freely!
Then the question is simple: suppose you jump from the 20th floor, you can jump at the moment when you are close to the ground, and then you may not be killed?
We can gradually rise from low to high to understand a little. It shouldn't be a problem to jump off the first floor. You have the opportunity to buffer the time of contact with the earth by "jumping", so that you will not die or get hurt at most!
Then the second floor, the third floor ... all the way to the twentieth floor. You will find that this is the process of quantitative change, so that you will die if you jump from several floors. We are not sure, but there is basically no way to jump above the fifth floor!
The most important point: Are you sure you can jump in the free-fall elevator?
You can't jump until the elevator breaks down! In a broken elevator, isn't it equivalent to jumping off the sky on a board?
With the rapid descent of the elevator, the human body is also accelerating. Your jumping speed is much lower than your drooping speed. If you don't pick it up, there is still hope in life. The correct posture should be to lean back against the wall, use the wall to protect the spine, and half squat with your legs apart, so that your legs will slow down the impact of sagging. How high can you jump? 10 meter? Are you kidding?