How Many Walls Stops A Lego Cannon?
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- čas přidán 28. 01. 2022
- Shooting balls of different weights into Lego castle walls. The same Lego rubber band cannon is used for all shots. Enjoy!
Making of the Lego cannon:
• Building a Lego Tank (...
Slow mo camera:
Sony RX100 V (can record at 1000 fps) - Zábava
Those U walls and supported walls models are a brilliant way to show how force transfers over a wall... in the slow motion, we can see that the pieces that took the biggest hits are actually the ones at the back, it's fascinating!
Yee
I thought the same thing
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I suppose it could be viewed as them taking a hit, however I was considering net force and would say they had the most force transferred to them through the system. All of the walls pushed against each other on the axis of the hit, and those pushes were all equal. That meant when the ends didn't have something to push against them they'd fly away however they still pushed against the sections of wall that are still standing. Absolutely love this kind of interaction and am rambling a bit, sorry :)
These tests were done on a baseplate allowed to move freely against the floor. This made it so a significant amount of force was absorbed by the baseplate tilting, which is unrealistic in lego war situations. It is very likely that the cannon would have more penetration power if the baseplate were bolted down (or otherwise fastened) to the floor.
Baseplate doesn’t move in the video though??
@@squirtlefails It does move ever so slightly, you can see some ripple like movement in the slow-mo shots.
I don't know what that means in terms of energy transfer or whatever so
I'd say it moves quite significantly. The edges get a good amount of air, on top of the rippling effect. It similarly would've been interesting to see the effect of different points of impact, e.g. higher or lower on the wall.
@@rk9island i think this applies to the 1st and 3rd Newton Laws. The baseplate moving back is from the reaction and helped absorb some of the force, its kinda like suspension i think, if the baseplate didnt move back the full force would be absorbed by the walls.
bro wtf is a "realistic" "lego war situation"
I just watched a guy shoot marbles at plastic for 4 minutes and I enjoyed every second
perfectly said, couldn’t be more accurate :)
he just like me fr
*dies of laughter* thanks for killing me! see you at my non-existent funeral!
Same
And there’s something hilarious about the poor little knight flying backwards under a tsunami of black plastic🤣
This further proves that lego is a great way of a tank defense.
Single wall vs howitzer
Lego Abrams vs 40mm cannon
There was no unnecessary attempt to get 10 minutes, no long intro about subscribing, no filler, no click bait, no voice at all. You delivered exactly what you said in a very entertaining way.
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@@worldprops333 He’s not even a bot. If he’s a bot, then he would have a Mr beast pfp and a verified checkmark. His video will also look like “Who is (insert username here)?” or something similar.
@@HalfLife3onSteamPLZ ik
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1:52 I really like how the initial blow of the ball didn't break the walls, but the recoil from the baseplate resetting back to its flat position flung the walls off of the baseplate haha
ewwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww audgadgahdgaydgwuagdusgduwgahsdgwhagsjdgwjagsjd bleh bots!!!
@@worldprops333 so many bots man
The force went back, but when there was no way to go back, they went up instead. Freaky
@@runtergerutscht4401 Not really, think back to high school physics class.
One of the rules that's battered into your head is "any force will have an equal and opposite force applied to the object exerting the initial force". In any given impact, the ball is exerting force on the wall backwards (toward the lego man), causing it to either slow down or to cause it to go flying the other way. The walls accept the backward force spreading them throughout themselves and anything they're attached to, creating a downward force on the base. The downward force on the plate causes an upward force on the plate, causing one of two situations, either pushing the wall up, surrendering the wall to the initial blast backward by the ball, or the walls hold, allowing the baseplate to push off of the table, creating an upward force in the baseplate itself.
(There'd also be a backward force on the baseplate, since it's attached to the walls until they pop off, but I'm going to assume that the baseplate was stopped from going backwards, somehow.)
I like it because it was just like "Surprise! There's another wall!"
If this dude was my science teacher, I would love science.
I mean rechnically Statics are scinece I guess, but I don't think most construction engineers would call themselves scientists.
Scientist is the guy who figures out that mass and size affect the outcome of the impact. Engineer is the guy who figures out how to make the better cannon and/or wall.
@@brandonquist8394 🤓
And exactly what science did you learned here?
@@illseeyaonthedarksideofthemoon Distribution of cinetic force in physical objects.
So physics.
Seeing the reflection of the camera in the metal balls was nice
I love this because, although this is still a recorded experiment, I think it's the closest I've seen to you just playing with legos. Like, simply setting up lego walls and attacking them with lego weapons? That sounds like something so many of us did as kids and I'd be lying to say it doesn't still sound fun!
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A surprisingly large amount of science is just adults playing with toys and writing down what happens.
unfortunately, it seems that some of us kids could not play with this amount of lego bricks since they were HELLA EXPENSIVE(and they still are)
@@worldprops333 do you think everybody who isn't toxic is a bot?
When i was a kid I always tried to simulate 9/11 World Trade Center.
I threw a Lego plane at a Lego house
Suggestion:
- Add weight to the ground, so the energy is not lost in it
- Double/Triple check when a marble fails, to see if it fully fails, before going on to a stronger one
true
I bet he checked off-camera and didn't add it to the video
@@Secreto31126 still, in the presentation of the experiment numerous test should be shown to display the varying outcomes of each shot.
@@fordo5361 nah mate we don't need a 30min video that might as well be 5min long
@@MikoOhneHose not hard to have a sped up sequence of shots, instead of a 5 minute video it could be made to be 10 and have ad revenue also
I’m so glad the findings were included at the end. I really wanted to see them all compared.
As an engineering major, watching these videos gets me more excited for engineering than my actual design classes lol. LOVE THESE!!
Lol..... yeah this is more interesting than I thought it would be
Brave knight: so what kind of tests are these going to be?
Oh, just some structural tests. You should survive most of the time.
Brave knight: ... should survive?
I would be more concerned with "most of the time"
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Thanks for your 18+ spam.
I find it mighty interesting that it’s more efficient to use single walls rather than any other against tungsten.
And steel as well
More efficient for one shot.
But if you're going to do engineering, you want longevity, something that larger walls give you against multiple shots.
It’s because it acts like a long shock absorber with all the space between the walls
It's super interesting how, except for the tungsten double wall and steel double and quad, the total number of wall pieces in all the tests after single are either within 1 wall of the number it takes for the single, or the first multiple of that kind of wall that's greater than or equal to the number it takes for single walls. And even in those exceptions, it's still pretty close: all of those exceptions only use 1 more group of wall pieces than needed to meet the constrant I mentioned, and I wonder if we would see those numbers come down if it was averaged across repeated tests.
long u wall??
literally only took 5 walls to deflect tungsten
Loved that this video just started. No excessive talking/ explanations, just went into what we came to see
Man I love these things here because they are such good demonstrations of just regular concepts in both physics and engineering lol
Next up: How to build a particle accelerator out of LEGO
Hes gonna invent new lego pieces i swear
JK Brickworks has done that (well, rather a Lego football/basketball accelerator).
oh shit
How to clone the earth using legos
it would be possible when they invent extra stronk legos
There's another level you could go with the ball, but you're getting into very expensive territory. Tungsten carbide 15.63 g/cm³, ultimate level is iridium at 22.56 g/cm³
how did you calculate that and some bot is litterally doing this again
@@Vlyg11 no need for any calculating. just go look at basically any density chart
Ye
Isnt osmium even denser? Even if its super expensive
Actually, osmium is slightly denser. The original density calculations were off, and no one bothered to redo the test for a long time, long enough for it to be common knowledge that iridium is the densest.
Very good video , I enjoyed it completely, and best of all: No annoying music, no annoying voice-over narration. Just pure, Lego Engineering and quality Slow-Motion footage 🥰☝🏻⭐️ 🥇 🏆
0:16 The way the marble just took them all out so cleanly caught me off guard. xD
I love how the comment section is just a meeting of different engineers, this channel is really going well, I'm proud of it
Eh, people might think they're smart, but actual smart people wouldn't feel the need to show off their "intelligence" in a youtube comment. It's more like pit of circlejerking.
I think we should get a part 2 with this video. I want to see how you would defend against repeated strikes, let’s say 3-5 shots. Walls aren’t build to take one hit and crumble and say they worked, walls are meant to stand the test of time and battle.
Also the base plate thing everyone else mentioned.
same
Well, not really, tungsten balls are the equivalent of a cannon in real life and a real wall, also its a really close distance so the shot is at the max speed, so no, real walls against real cannons dont last long either
@@ericmagana3215 I'd say they definitely do, considering many forts throughout history took many tens, or even hundreds of thousands of cannon balls during sieges that lasted many months before finally falling.
@@tuxtitan780 but were they shot from 10 centimeters of distance?, there are many things here, for example thr base of the wall if it was buried would give thr walls stronges bases, this lego one is only holding with a few studs, but like i said, i doubt they were shot at point blank range
@@tuxtitan780 I love how Americans just ignore a key factor of someone's conversation and then tell them they're wrong when in reality you are just stupid and can't read your own language :)
I never knew Lego was this educational
I'm amazed at what a dramatic difference adding too walls did. You were shooting the crack in between them so I thought it would be weaker.
I'd like to think that this is exactly how primitive humans did their tests before building castles.
They build, lost and made it thicker
Just a man dying over and over 8 times
"Alright Sven, we've finished the wall. Now go stand behind it while we fire a cannon at you."
@@EpicNerdsWithCameras Haha xD It's always poor Sven!
@@EpicNerdsWithCameras Lmao
That is awesome, seeing how the energy dissipates. Would you be willing to do a series where the base plate is strapped down or secured, such that the walls can't transfer energy to it?
@Torrent Amador same here, its a shame CZcams is focusing more on removing the dislike button than fixing actual issues like the rampant bots that make Russia look like amateurs
@@baconwizard yea youtube is more concerned with censoring peoples opinions rather than sexbots
@@nou5440 The fact they haven't sorted out these literal porn-spambots, yet added "Misinformation" as a report reason shows their priorities.
@@baconwizard Dislike button removed?
I was gonna suggest the same thing
I love this video. Straight-forward to the point, no BS, just giving the viewers exactly what we clicked up the video for.
i love how sometime the walls just get thrown like they are in a physics simulation lol
1:52 can we just apreciate how clean that coordonated jump was?
idk can we?
idk can we?
idk can we?
Idk can we?
idk can we?
Can we also give some love to the knight putting himself literally in the line of fire for these experiments? That takes a lot of BALLS to do!
That little man is so brave. He was hitten many many times, crushed by walls in such a brutal way, and still he`s standing the ground again and proudly hold the flag !
This does a really good job of showing some properties of physics. Great job!
2:51 that was a really good design! The ball hits the middle of the wall and the energy spreads out to the side and goes into the side walls making the side walls fall off. This keep the front wall standing and protects the Lego man!
S C I E N C E IS AMAZING
This only happens because the base plate is not rigid. The breaking of a wall in this case is disconnection from the floor. The front walls survive as they can pull the base plate when rotating but not the back walls. So they break off.
@@Cyber_N-7660 P H Y S I C S (earrape)
Floor needsto be secured down. Otherwise a lot of energy is absorbed by the flexible floor instead of the walls.
@karolin don’t care
@@literallydeadpool based
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@@dinhtuan752 i know
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Love to see a video which goes straight to the point without tons of jargon or other unnecessary things. Gotta like that.
1:51 That Blue Marble just used his Karate skills to break the 1st
Quad wall in half. Good Job Marble!
I feel as if the results would change if the lego floor was held to the ground instead of being free to move up and down
Yeah I'd agree. I think he'd need less walls
Yeah, the energy would be more focused on the wall, instead of going over to the lego floor.
@@leafoftales4098 I think he would need more walls
@@Egerit100 Agreed
this is a bot.
I'd love to see you push the power of your lego cannon, gradually increasing the force and compensating each time it fails or breaks
Next video: How many neighbors stop a lego cannon?
Like that robot from the incredibles
@@Hypersaiyanike That's so weird, I just watched that scene.. yeah like that..
i hate how many bots there are
@@worldprops333 me too
Interesting that 13 single walls is actually more resource efficient than 8 double walls for the same survivability (especially when you consider that 12 single walls was BASICALLY a survival)
(Although obviously if you were to build this as an actual castle, you’d be getting effects more like the octa-wall, so a double layer in a 8x8 or 10x10 square would make for a pretty tough structure)
I just had an idea from watching this video...
What if there was a competition where there are 2 competitors, 1 defender and 1 attacker.
The defender builds a Lego Base however they like within guidelines coming up with what they feel can withstand the attack.
The Attacker has these Canons and tries to expose and destroy an item at the centre of the defenders base (could be a mini figure or something) and once that item has been destroyed within a certain amount if attacks the attacker wins or if they fail the defender wins.
Obviously more rules need to be applied otherwise you could just make a 10 brick thick indestructible cube but I think it would be cool.
Poor lego guy. He goes through so much pain for -our entertainment- scientific research.
Dude. You seriously underestimate the lego guy.
All lego guys ever do is step on lego, they are practically immune to pain.
He had luck when ever the "BALLS" did not break through.
Yet he remains unflinchingly 🙂 throughout this experiment.
This isn't just for our entertainment. This is important scientific research.
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Wow this is actually really informative on physics, it always blows my mind when people use legos in creative ways
Destructive ways, too
Respect to the Lego figure who went through massive fear of getting killed by a marble
The varying of parameters to measure system sensitivity to perturbation as demonstrated in this video follows the essential principles of paramaterised ocean-atmosphere systems modelling and I'm sure my students are going to love it!
"Add more walls!"
- Sun Tzu, the art of war
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@@dinhtuan752 how do you know
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Ahhh yes yet another brilliant experiment.
Dang these bots are so annoying...
@@shotgun_blammo sadly, I was reporting these bots several times, but CZcams didn't do anything with the comments I reported, even hasn't deleted them.
ok, thanks for my content.
Wait... They are deleted!
@@mic8per yes, it looks like but there are still a few left
Damn, I can't believe one of these just popped up on my recommendations then I just zone out watching these relaxed because they're strangely therapeutically appeasing and satisfying to just watch - brings me back to get old Legos and constructs days but to the end the degree of ways I never thought possible lol - subbed and keep doing what you're doing - stay safe 😊👍
Watching that little piece of man flying in slow motion was a true epic entertainment!!
Thank you for this moment 😊
3:45 man just got uppercutted
Amazing how the density of the ball can have such an impact when fired from the same device.
I think this is because the cannon is limited by the maximum speed it can get the launcher to move. The balls all leave the cannon at similar velocities, so more energy is transferred to speed up the heavier balls instead of being lost in the cannon when the launcher hits the front. As the projectile mass approaches what the cannon is capable of moving, I think we'd see diminishing returns on how many walls it could breach.
Potential energy depends on the mass, just like how they can have different potential energy when sitting on the same table.
cause the launcher has mass too and the heavy ones can extract more energy from it than the light ones
F=ma vs e=mc2
Momentum vs kinetic energy
Pushing force vs impact energy
The rubber bands are accelerating both the push bar and the ball. With the lighter balls more energy is going to the bar which is lost when it strikes the end.
Watching the little soldier fly across the Lego board cracks me up.
This is a great way to show the engineering principle of moment of inertia (I). The length of the dimension perpendicular to the stress is much less effective than the length of the dimension parallel to the stress. Hence why the U-wall and single supported wall worked so well compared to the other combinations
The Lego floor seemed to hop on impact. I wonder if the results would be any different if the mat was more secured to the ground
Walls together strong 🤝
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Lol
There is something hilarious about seeing him going from "survived" to getting absolutely obliterated off screen the next shot.
2:28
my argument when someone uses 🤓
It's so interesting to see that each additional standard wall reduced the impact force by roughly half. Physics is neat.
Now we know that if we want to attack someone with a cannon the weight of the projectile is very important and if we what to defend form someones attacking with a cannon we can build a single well-supported wall. Thanks for the physics lessons.
Not weight but density, a big enough stack of paper will be as heavy as the tungsten projectile, but it won't be as practical and as effective.
this comment section has a bot infestation
I love how this demonstrates the principles of spaced armor too.
Once again this shows a truly real act of scientific data gathering.
Real world ballistic data can be extrapolated from this simple test.
Good work.
0:44 This just got real. Tungsten carbide is some dense, tough stuff.
data displayed at end of clip is even more interesting than test itself, the numbers resulting from the test are beautifully mathematically related to the mass of the spheres - and therefore to the kinetic energy. It would be awesome to check those 'bullets" shooted at speed generating enough force to penetrate wall (for the one made of steel), and than find out what will happen to the other ones at same velocity :D
Great observation! some quick data analysis reveals that the number of walls is approximately modelled by n=m*sqrt(x), where n is number of walls, x is the weight of the ball, and m is some constant coefficient. The coefficient m for the double wall was exactly double that of the quad wall, but the other coefficients didn't have any nice relations.
For those curious, I plotted the transformation z=sqrt(x) (square root of weight) against n and got a graph that was roughly linear (I tried a few other transformations, such as logarithmic and cube root [single wall fit a cube root well], but square root seemed the best fit across the board). When you have the "linear" graph n=mz, you can calculate m by doing rise/run and compare the model to the actual values. The model for the double wall was the "nicest" because comparing theoretical values correctly matched the actual values (after rounding)
2.12035979898674
3.37485975740272
5.99728316967547
8.12035979898674
Obviously many things made certain points deviate from the trend, such as the discrete nature of n, the fact that the kinetic energy may not have increased the same for each ball (as the cannon would eventually reach a limit where the increased weight would absorb all kinetic energy of the elastic bands, meaning any extra weight would have the same KE), and the fact that the flexible floor absorbed some impact, to name a few things.
@@Wagon_Lord also - friction and resistance between the floor and walls resulting from the method of connection - push-fit. And in case of floor, other than flex i will assume also motion and friction wich will count as absorbent, different each time because of changing mass of entire structure dependant on number of used wall elements
@@Wagon_Lord Quite strange, I found that the number of walls destroyed is more proportional to the cubic root of the weight...
@@noefillon1749 Yes for the single wall I found cube root/cubic a better model, but for the others, square root fit the trend better
@@Wagon_Lord I chose to only look for the first column because the number in the others are really small.
Anyway I would like to test a model :
The potential energy E0 in the rubber band, that will be given to what is attached to it is a constant (doesnt depend on the mass of the ball).
The energy lost by friction with lego thing in contact withe the ball is also constant Ef1 = F*L where L is the length of the ramp.
Let's say E0 - Ef1 = E1 (it's a constant).
The energy lost by friction with the ball is proportional to its mass, Ef2 = k1*m (may be it's less than a proportional model but not more, because if the ball starts rolling in the ramp, the friction decreases). May be we can negelect this contribution.
Then the remaining of the mass E1 - Ef2 will be given to the ball (E) and to the lego thing attached to the ball (E') that also moves at the same speed, proportionnally to each one's mass (m and m') :
E/m = E'/m'
and E+E' = E1-Ef2
E = (E1-Ef2)*m / (m+m')
E = (E1*m - k1*m²) / (m+m')
We can use this model supposing that the number of wall destroyed is proportional to E :
n = (n1*m - k*m²) / (m+m')
This model shows that there is an optimal mass to destroy the most walls (which is quite realistic, even though I don't know if a power between 1 and 2 on m in k2*m² isn't better than 2).
I suppposed that the pulling force of the band was bigger than the friction. But the contrary is totally possible and this is where the model gives negative values. It should be n = max(0 ; (n1*m - k*m²) / (m+m')).
Straight to the point
No intro no explaining just pure content 🔥
everyone's gangsta until they come up with a ball made of something that your science teacher taught you about in college
Lego soldier be like:
"I'm not getting paid enough for this."
3:06 the side walls popping off, but front walls standing is some loony toons shit.
No it’s because the force was transmitted to the ends of the walls
I have learned more about physics, construction, torque, iterative improvement and patience from this channel in ten videos than from my entire time in the education system.
"How Many Walls Stops A Lego Cannon?"
Bro, That's A BALLISTA
I love how when one quantity of walls finally stops the projectile, the next one just clears them all right out of frame.
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Would be interesting to see how the wide walls fare against multiple lighter shots, once the connecting bricks have been damaged/blown off I assume that the wall is weakened substantially at that point.
If only he taped the base plate to the table for accurate force dissipation
Well at that stage , adhesives should be allowed too then
shut up bot
I suggest some reruns, we must be ABSOLUTELY sure it protected the Lego man
I love how every first time for a new type of ball just absolutely DEMOLISHES the defense
And that's why walls built to withstand artillery fire were packed with dirt behind them. They were pretty much layered hills laced with stone bricks.
theres a lot of good practical physics in this video, pretty cool
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I felt sorry for the little Lego Knight, so valiantly guarding behind his wall(s) whatever was coming his way.
With just walls most efficient:
Against plastic(1.5g) - double and quad(4 walls)
Against glass(3.8g) - doubles(6 walls)
Against steel(12g) - singles(10 walls)
Against tungsten carbide(22g) - singles(13 walls)
1:21 Getting piled on by walls :D lol got me chuckled!
I just love seeing a set of walls hold up to a shot, then the next level shot crushing the Lego king in a pile of walls. Made me giggle every time.
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This video goes straight to my favorites. I love the editing, amazing 👏
I love your videos. Perfect content - no commentary, just great footage. Thank you and I subscribed instantly.
1:46 only that flat 1x2 went flying!
Watching the walls jump out of their spots from the impact is really, really satisfying, especially in slowmo.
I feel like a child. I laughed so much.
The nerves of steel on these soldiers is incredible.. 👏
I remember the days of eld where Knights were so chivalrous to one another, they allowed the enemy Ballista to get within 7 bricks of the wall before firing.
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The bravest little soldier, that one.
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Ladies and gentlemen. The perfect demonstration on why wall support is exceedingly important.
I feel like these could be used as a great way to show how solid engineering solutions can save a lot of money and resources compared to brute force solutions. Very nice!
3:27 new sets functions be like
That poor castle will make a good historic site in 500 years.
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reminds me of a downsized version of a slingshot crossbow I made once; perhaps the heavier balls deliver more energy as the rubber band is limited by it's contraction speed with the lighter weights.
We used to make these back in the day, the draw was manual though, as this was the early nineties. We all built a fort, occupied it with the lego toons, and then wreaked havoc on each other. We called them smoothie guns because of the need to use the smooth tiles on the firing track. Good times.
2:36 lol ablative armor
Love how the wall simply split in half at 1:07
I love how its just, plastic ball(casual, we chill), and then a marble(ouch, that would hurt if it hit me), and the smell ball(ok now this is an actual weapon), Tungsten carbide ball, *this time out loud* BRO SKI CHILL
This is a perfect example of how arrow lethality works in hunting. The heavier arrow may go slower, but it penetrates better
My favorite type of run 0:27
Gyro favorite food
Finally another jojo fan
Is that a jojo reference?
@@arandomstranger6976 no
3:01 *dethathes booster and faring*
The walls flying apart in slow motion is oddly satisfying
I love how that middle piece always gets blasted into space