vsauce, i’m jake and my parents have leftme…home...alone. which is scary because i’m only 8 yearsold but the silver lining is, that being 8, i have an incredibly intuitive understandingof thermal dynamics, mechanical engineering, and physics in general. which is good because there have been a lot of robberies in my neighborhood. so to protect myself i've recreated some of the traps from the movie home alone. now, there have been videos and articles about this before, about how damaging the traps would be. but nobody has recreated them, physically,and tested them on the human body…or in our case, a ballistic dummy.
so we will be testing two traps that alwaysstood out to me as being the most fascinating: the red hot door handle, and paint can tothe face. as a bonus, even though it isn’t a trap,the crowbar to the chest because that just has to be dangerous, that is if you even madeit past those first two. oh…i think i hear the bandits coming towardsthe house, i’m gonna go get ready. hey, we’re the threadbanger bandits andwe are robbing all these empty houses, right corinne? that's right rob. we're gonna knock off this little 8 yearold kid cus it’s not like he has a bunch of intricate traps set up that could seriouslyhurt us.
exactly. corinne, you check the front door and i’lltry the back. now we need to heat up a door handle to sucha, literal, degree that it glows red, becomes incandescent, that is the emission of electromagneticradiation from a hot body that makes it visible. in the film they use an electric bbq lighterplaced on the interior side of the door, and the heat then transfers from the brass knob,through the steel spindle into the exterior knob. one thing to consider before we test: theobject that is holding this hot door handle. the door is metal but the interior of it iswood and foam…so if i had to hypothesis
what’d happen, if we heat the knob closeto 1000â°f, the temperature at which it will glow, then the metal door will start to warpand the foam and wood inside it will combust into flame…which wouldn’t be good. but there’s only one way to know for sure. after 30 minutes the interior door handlegot to around 900 degrees f. the exterior door knob, only about 65 degrees f. it’staking a very long time so to speed things up we are going to use this map gas torchto get things a little bit hotter a little bit more quickly. the exterior door knob only got to about 115degrees f which still wouldn’t be that pleasant
to touch but wouldn’t do that much damage. the interior door knob we got to a total temperatureof 1400 degrees f. which is incredibly hot. to test how badly it would burn instead ofusing a hand we used pork belly, which has similar skin thickness. and held it on the door handle for 3 secondslike in the film. and the burn results were pretty similar tothe movie and pretty severe. but more importantly what did happen whichi thought would, the interior of the door lit on fire. the wood, the foam burned.
the metal right here warped, we could actuallysee some fire coming out of the door knob. over hours you could probably get the exteriordoor knob to heat up not hot enough to glow, to be incandescent. but the interior door knob would get thereover a long enough period of time. let’s move on. and it should be noted that with this goingfor hours the door would most likely, totally light on fire which defeats the purpose becausethe villains could just walk right in. so...ya know. the hot door knob is very similar to the blowtorchto the head trap from the film which my friend
mark rober and i tested over on his channel. and speaking of heads and mark rober, let’sfind out what happens when a full can of paint hits you there. to help explain, the star of my favorite b&w gangster film “angles with filthy physicsâ€, mechanical engineer mark rober. i’m gonna give you to the count of 10 to get yourugly, yella, no good - oh, vsauce! it’s you. let’s talk paint can to the face physics. a standard 1 gallon can of paint has a massof about 13lbs. in the film the can is
dropped from the top of the stairs with thebandits roughly in the middle. this means, as it falls, it gains speed becauseof the conversion of gravitation potential energy to kinetic, which works out to 17 mph. this is the speed of the can as if it werejust released, but you add in a swing before release meaning you have a 13lb paint cancoming towards your head at 20mph. now if we assume your face crumples a bitand stops this paint can in about 3/4 of an inch of travel, that puts the impact forceat 12kn. that is like getting bare knuckle punchedby mike tyson twice at one time. 12kn is 6 times more force than is requiredto break your nose.
then, if we take that force and divide bythe mass of your head that means your head snaps back at 266g’s. that means there is virtually a 100% chanceyou will be knocked out and a 42% chance your skull would actually crack. now where was i? oh yeah! i'm gonna give you 10 seconds to get no good, yella belly, ugly, dirty rotten keester outta here. as mark was saying, your skull cracking is not good. also, because of the way the head is struck,the bandits are likely to suffer an unhealthy dose of whiplash – causing even more damageto the brain. after this trap, your burgling days are most likely over. hey!
he’s at the top of the stairs! i think i need to go to the hospital, my handis pretty burned. get him! time to test the trap! so a paint can to the face would be incredibly devastating...which i feel is an understatement. but luckily for us, threadbangerbandits are very, very tough so this brings us to the last test: the crowbar to the chest. i just need one thing...oh. here it is! ahhhhhhhhh!
why is this happening to me? rob...what are you doing? corinne…don’t move. the crowbars weighs about 5lbs. and is swinging through the air ataround 35 mph it will deliver a total force of 15,000n. about 4.5 times the amount of force neededto break an average human rib. it broke through the skin, 7ribs, and in this test actually punctured a lung and the heart. ok, so after doing this tests, what did we find out? well, the hot door handle would get very, very, very hot give enough time, a very long time.
you'd get 3rd degree burns on your hand and you would probably have to go to a hospital. you wouldn't be able to use this baby for the rest of the night then we get to paint can to the head. which is devastating, really cool, but really devastating. that would be the end of your robbing career and you probably wouldn't walk away from it. but you do, some how, and we get to crowbar to the chest. which not only breaks your ribs but punctures your internal organs. and that's not good and you should really go see a doctor at this point if this happens to you. please this is just a psa from me to you. so could you survive the home alone traps? most likely probably, pretty much, no you couldn't.
which makes me think i should check on rob and corinne... and, as always, thanks for watching.
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