Ive experienced a sudden stop at about 10km without a seatbelt, and the sudden hard knock of my head against the windshield was a very clear wakeup call . Even at that speed i had a nasty headache and a mild concussion
In my 20s, usta pedal my bicycle down a long hill with two lanes of light traffic on my side. 30 mph. No helmet, probably wearing shorts and tshirt, sewer grates on the edge. Traffic signal at the bottom. Idiot. Then I started skydiving. Good times, meaning I survived. 🙄😁
I fell off motorcycles at 100kmh or more several times. These are not impacts at 100kmh unless you slide into a stationary object. The biggest impact I experienced in each case was falling from a seated position onto the road surface. You can reproduce this impact in your kitchen by falling off your chair. I did suffer a small bruise in one of those incidents.
I saw a video about accident impacts. The guy in the video recounted how he asked various members of the audience what speed they thought an impact with minimal injury might be after explaining how an unrestrained passenger impacts the interior of a vehicle. Most said between 30 and 80 kmh. He then told them that an average runner runs at around 20kmh and invited anyone to run head first into the brick wall for the entertainment of the rest of the audience
@@strobi0001That's if we're talking long distance running. For a short sprint, 20 km/h is actually a pretty normal speed for someone who's not that well-trained.
@@aoyuki1409 Sprinting was not mentioned originally. Anyway, the whole story is like, if you watch from far enough and neglect as much as possible, can be true. If you understand physics, you can decide by yourself.
@@strobi0001i mean with your corrections it's even more striking though ? You probably don't want to be running directly into a wall, even at a speed which doesn't even reach 20km/h because most people don't run that fast. So applying that same logic to car speeds, you REALLY don't want that happening (especially without wearing a seatbelt)
Had a 30 mph head on crash about 30 years ago. Wearing a seatbelt. I still have the scars. Edit: I never thought this comment would have got so many comments. To clear any confusion. What I'm saying is I wore a seatbelt and have scars that are still there to this day. Imagine what would have happened if I wasn't wearing a seatbelt. I knew I would be in a really bad way without a seatbelt. I've never really thought about it much until I wrote the original comment but wearing that seatbelt possibly saved my life.
Unless u were both doing 15mph. It was a 60mph head on collision. That’s why most people die even at low speeds. When ur approaching each other you have to add the speeds. Edit: For all u numb skulls. It’s not like hitting a wall at 30mph. The fucking wall is doing 0mph while the opposing car is doing 30mph. Come on people.
It's amazing how easily people underestimate speeds. Hitting something at 10km/h is like falling from a height of 40cm. Not too bad, but you feel it 20 km/h already is like falling from 1.5m height. Faceplanting on concrete like that already can kill you. 30km/h is like falling from 3.5m height. Ouch. 50 km/h corresponds to almost 10m fall. 70 km/h corresponds to 19m fall 100 km/h to 39m fall. Of course, if you are the one who is going fast and you don't hit a wall but slide across the road, then it's less extreme. But if you're a pedestrian who gets hit by a car or even a SUV or truck, then the above pretty much does apply.
Cars have crumple zones. You can't say that the force felt by a driver in a 40km/h head on CAR crash is the same as coming to a full stop instantly. The car structure would take some of the forces and expand them all over the main structural parts. The shock would not be as strong as in the first situation...
@@vali2638 to some extent sure, but I hardly think it would absorb most of the energy. The car itself sure, but if you are not connected to the car by more than the friction of the seat surface and maybe your foot on the pedals, then the smoothened deceleration of the car can't do all that much for you. Ultimately, the car around you will be well on its way to stationary while you are still flying at almost the speed you were driving at, and whether you hit the dash at 30kph or at 25, while likely a non-insignificant change of outcome, will still hurt like an absolute b!tch and send you to the hospital
yeah but this device and those devices you saw aren't really accurate, a real car always absorbs some of the energy of the crash while these things only simulate a sudden stop from 100% to 0%
@@JaydenPlaydeni don't care if it absorbs literally 90% of the speed, i dont imagine you stub your toe at more than 5 kph and that hurts a lot, on just one toe. 50 kph isn't that fast, your head is way more sensitive to damage than your toe, and i seriously doubt it actually absorbs 90% (which probably wouldn't really help anyway since the sudden deceleration is why crashes are dangerous and its not like it gets 5 minutes to slow the car down).
We had one of these in my driving school and they asked us how fast we think we could go and brace without wearing a seatbelt. I said about 5km/h but some idiots thought they could brace at like 40km/h. We got on the machine one after the other and I think did a test without a seatbelt at like 10km/h and one with a seatbelt at like 20. Obviously those people changed their minds.
@@Shrimp_Insurance Definitely broken glass. My passenger wasn’t wearing his either and we both went into the windshield. My dad tried for years to get it though my thick head to wear my seatbelt but I finally understood that day.
No, the top of the headrest has to be level with the top of your head. Also, the space between the headrest and the back of your head should be no larger than 4 cm (slightly over 1 inch) while driving.
It doesn’t have to be level with the top of your head - it only has to be high enough to not allow it to cause your skull to be detached from your spine on impact. And it also only needs to be that in a rear-end collision, which is not what was happening here.
A friend of mine was driving down an old logging road going back to his camping site. He dropped a smoke on the floor, stopped the vehicle, but let his foot off the brake while he bent over to look for the smoke. He couldn't find it so he was down there for maybe 10 seconds and in his mind he had not even moved, but in reality the car was slowly accelerating to somewhere between 10-20 kph and veered off the road into a tree. He is now in a wheelchair for life he broke his neck and will never walk again... The car wasn't even damaged like seriously not a scratch. You just never know what might kill you.
Handicapped for life over a single cigarette. Wow, id never be able to live with myself. Everyday not being able to walk and just imaging all the things id be able to do if it were not for a single cigarette. Just imagining it is making me depressed.
I've been in an 8km/h crash simulation with seatbelts, and even though its slow, it does hurt. You dont receive any damage, but I felt it for the next 1-2 days.
@@jazzabighits4473perhaps, it isn't much, but it's about a double of the speed of walking. Doesn't it hurt, if you would hit the wall, just walking forward with standard speed of ~4-5 km/h?
@@Aboutallinfo Slightly. But you get harder impacts playing footy and getting tackled, especially when you're running and someone else is running into you. I understand there is "give" because running into a human isn't like running into a wall, but the higher speeds should make the forces about the same (or higher in terms of footy, especially a shoulder charge).
That's a matter of detail, but when a crash between a car and a wall occurs at the same speed as in your experiment, the car's structure will deform and will absorb some of the energy of the crash, therefore the inertia of the body will be somehow lower (in your experiment there is no deformation, therefore the entire energy of the crash is transmitted to the gentleman sitting on that car chair). The same applies when there are two cars each travelling at 10 km/h, both of the cars will absorb some of the energy. Of course, this is no excuse for not wearing the seat belt - this is mandatory at any speed one would be travelling!
Without a seat belt, the car absorbing the force of the crash does exactly jack for you - you continue forward at the speed the car was going. That's why you wear a seat belt, so you decelerate with the car.
That won't help an unbelted person. That would only be the case of the car and person were attached as a rigid body. In the case of no seatbelt, they are separate, unattached. The car may slow down and stop but the person will keep going at the speed the car was going until it hits something to stop it. In a lot of cases, the hard dash or the pavement outside of the car.
10 km/h = 6.2 mph, this is NOTHING in terms of speed, yet watch how much he gets FORCED out of his seat by MOMENTUM. Newton's 1st Law (it's a law, not a suggestion): An object in motion stays in motion unless acted on by an outside force This means the "car" stopped but you keep moving forward until you hit something. Now if you are wearing your seatbelt, guess what, you hit the seatbelt, thus stopping your forward momentum. If you are not, you get thrown into the dashboard and windshield. Now imagine that guy getting thrown into a windshield at that speed, it would likely give him a pretty damn good headache. That was just 6 miles per hour, we travel more than TWICE that speed in RESIDENTAL AREAS (typically 15 miles per hour), so DOUBLE that force, now you have a guaranteed grade 1 concussion at just 15 mph without a seatbelt. Now lets move on to city roads at 30 miles per hour, we can effectively double the previous result, congratulations you now have a grade 3 concussion with a possible skull fracture and you may have broken your windshield with your head. Now lets move on to our last example, city highway speeds which tend to be 45 - 50 miles per hour. You are guaranteed a grade 3 concussion, TBI, brain bleeding, and you WILL shatter your windshield with your head, skull fracturing is almost a guarantee here. Your instant L/D (Live/Die) chances are 40/60, that's INSTANT DEATH chances. Wear your damn seatbelts.
My cousin was in a very low speed crash. She didn't wear a seat belt. She was paralyzed for many years. RIP. If she wore a seat belt she would have walked away.
This would be a perfect intro for a CSI episode. Everything's normal at first, but when they press the start button the car gets launched into the wall at 250 km/h and the guy dies. Then Marg Helgenberger comes in to figure out who tampered with the controls.
The worst bicycle accident I ever had was at 1-3 kph. I bunny hopped my front wheel up onto the kerb and the wheel came out of the quick release. Just went face first into the pavement while tangled up with the bicycle. I lay there for quite a while in shock before a motorist stopped. Sometimes, the lack of momentum to distribute force over time and distance i.e. sliding makes for a very harsh impact.
I had a similar crash. Hit a hole on the street and the bicycle stopped and that made me spin into the ground. After the hit the bench kept going and hit me in the back of the head causing some bleeding. I was in such shock that I wasn't quite there processing what was going on. It was weird because I was calm though.
Imagine running your max speed straight into a wall, that won't kill you but can definitely hurt and injure you quite a lot depending on which part made contact first, might take a few days or even weeks to heal. That is about 12 kmph. If you don't ever wanna experience something similar or MUCH WORSE, wear a seat belt.
I don't think the comments here get the point, which is that even at really low speeds that shit would launch your face into your windshield and steering column in a real car. This test is only safe because there were no material obstacles.
Very importantly, the guy also had almost 3 business days to expect the wall and impact, bracing yourself at this speed is still possible with enough warning. Considering you can brake to standstill in under a second from even double this speed, there's no accident you could ever get into where you could ever brace like this (because you could easily just stop the car before ever hitting something), unless you're not driving and whoever is is sleeping, or you're sitting in a parked car and someone speeds directly into you
Expect that it's not realistic, here the seat stopps almost instantly, while car is designed to wreck a little, so it will absorb the impact, and impact going 10km/h would be much less noticable
What even scarier is that, based on physics, the forces climb exponentially. So a 20mph crash is 4 times this 10mph force, 30mph is 9 times the force and a 50mph crash is 25 times the force.
@@NithavelaNo, an exponential function is of the form b^x, where b is the base and x, the variable, is the exponent. A quadratic is of the form x^e where x, the variable, is the base, and e is the exponent, in this case 2. If you graph both functions, you'll see that they have very different behavior.
There does not appear to anything that puts this video in context. The setup resembles a car interior but there is no steering wheel or dash board. It looks like some of the force of impact is diminished by the test subjects transition to near-standing. Whatever the braking mechanism that brings the seat and the subject to a halt will have an influence on any potential for injury depending on the level of deceleration. The screen at the end of travel would have less potential for injury if it could absorb energy like an air bag or a pillow. A hard surface like metal or concrete or even glass would have different implications.
They could have made it a prank . Tell the Guinea pig it will be a 10 kph impact when in fact you launch the seat at about 50 kph. If the guy is upset just yell : it’s a prank bro! Come on it s a prank brooooo
Yeah I know on youtube robbing a bank at gunpoint and attempted murder is considered "pranks"... And the most sick is that youtube allow these "prank channels" doing things that normally give you 10 years to life in prison to go on posting, just because they call it a "prank".
I think future generations will wonder how did we normalize such a dangerous method of transportation such as motor mobiles, that can kill you in a matter of seconds
I was surprised how, with his feet firmly on the floor, the upper body move UP! So specifically up, not forward. I can definitely see how banging the top of my head into cab roof would hurt, would distract and disorient, and very much impair my driving skills. Right at the moment I need them most to maneuver out of an oncoming crash. A good reminder to wear a seatbelt. And drive smart.
As his feet didn't move (gripped on the floor even a small amount) his body in motion rotated around that static point. Hence, he came *up* out of the chair. In an average car, your knees tend to be straighter with your feet more in front of you. Unbelted in a crash you slide off your seat making contact with whatever is in front of you. Modern cars have 'knee bolsters' softer dashboards and air bags to put something soft between your head and hard bits- like glass. Yes, wear a seatbelt. Don't trust that your smart driving will compensate for the other idiots out there.
I've ask my students every year, "Do you think it's safe to drive 20mph without a seatbelt? What about 15mph? What about 10mph?".... (32kph, 24kph, 16kph respectfully)... I then ask does anyone know in mph how fast they can run? I ask the track students what there times are at 100 meter dash... We then calculate it mph or we have the students sprint across the lab. Its usually like10-20mph. So I think ask, "what do think would happen if you run full blast without slowing down into that brick wall?"... "What if you went head first?" Then why would you think it would be safe when your going 10mph, wreck, and slam your head into the windshield at that speed? A seatbelt distributes the force over a large area. It give slightly also.
You're exactly right, but the problem is that you will hit the inside of the car at 10 km/h after it has stopped. The slower deceleration of a well-engineered car doesn't help you much when your rib cage is smashed against the steering column (etc.)
That's not how this works. Crumple zones spread the deceleration of the car out over a longer period of time, but someone who isn't strapped to the car will get flung forward with the same speed difference regardless.
The car will stop relatively smoothly compared to the video, but that hardly matters for crash severety here. Usually, that crumpling is great for you because it reduces your speed a lot before you start kissing the steering wheel, but for it to be of much help this smooth(er) deceleration needs to be able to affect you. Without a seatbelt, you pretty much only have the friction of your pants on the seat, so the amount of force the car can transfer to you is quite small, i.e. you will not decelerate much whilst the car crumples. However, you will decelerate soon after, just that the impact will be with the dash and the crumple zone will be your face
@@markchristian787 it literally can't be reliably proven, hence why it's a theory. ever heard of correlation=/=causation? Regardless, you're either a troll or a very ignorant person, and I have no intention of conversing with either any further. Have a good day :)
I don't believe this, me running at 10km/h seems way faster than that chair moving. Tomorrow i'll try it at the gym (the running part, not the inchident)
I don't know why but I'd rather die before being required to wear a seat belt. And I 100% believe everyone should because it makes logical sense, but still I don't want to
Remember, even a 25 km/h impact with no seatbelt is the equivalent of sprinting headfirst into a wall. Cars are much faster and heavier than our normal perceptions of speed and mass are used to.
What did it for me: As a kid I would watch the tv’s that the Mercedes garage my dad worked at, on it they had all the crash tests with shots from outside and inside the car, but more importantly cases where passengers/driver were not wearing seatbelts. If you’ve seen a very reel crash test dummy punch its face in a dashboard - or worse - it’s skull through a windshield then those 3 seconds to buckle up are a real no brainer
I rolled a semi many years ago and the one thing that saved my life was not wearing my seatbelt. If I had of been wearing it I would have been crushed and pinned but saying that it was a 1 in 100 situation and I've worn one everyday since.
impulse and momentum, crumple zones on cars distribute the force and slow down overall deceleration. this is unrealistic and when people realize that they’re gonna stop wearing seatbelts. this is like the ‘D.A.R.E.’ of vehicle saftey
With all due respect, why all the physics words when you don't entirely understand how they work in this scenario? Sorry if this sounds aggressive, I really don't mean it that way but I don't know how else to say this, I'm not that great with words. Just to clear things up for you and anyone reading this (my creds are I'm not a physics major but studying an adjacent field, and I was a massive physics nerd for forever): Yes crumple zones are an amazing concept, but for the car slowing down (more) smoothly to do anything good for you in a crash, you need to slow down with it, i.e. a lot of the force of deceleration of the car needs to be transferred to you. With a seatbelt this works wonders and will reduce your speed a lot before you start getting close to the wheel / dash / front seat (which is when an airbag comes in handy), HOWEVER: you aren't wearing a seatbelt here, which means that the limit on how much force the car can transfer to you isn't the force limiter of the belt or its tensile strength / your ribcage's tensile strength, but instead it's the relatively modest amount of friction resistance of your butt on the leather / canvas interior. Put in simple terms, unless your back and butt are glued to the seat you're flying, because the only thing keeping you in place is that friction and it's far from enough to slow you down even remotely as quickly as a crash. Compared to a seatbelt across your torso the force that can reach you will be almost nothing, accordingly you will feel little of the benefit of the car crumpling. Now, the car has stopped or is close to doing so, and this part of a few fractions of a second probably felt fine because you didn't feel much force at all. Only problem is, you are still flying forward at almost your driving speed, maybe a few km/h less if you predicted the accident and managed to brace a bit, but the car structure around you is stationary, meaning your skull and torso are now the new crumple zones
