To purchase this video for media use visit video.storyful.... For Storyful Newswire subscription inquiries, please contact sales@storyful.com Source: TH-cam/Mark Hossler
I once built one from toothpicks in College for an intro to architecture class ( I was in Engineering school) The teacher brought a bunch of weights for the test (like above). They saved mine for last (it looked the nicest). It was able to take ALL of the weight the teacher brought and ALL OF THE TEXTBOOKS the student had brought to class and STILL did not break. The teacher stopped the test before it broke and "confiscated" the model to investigate. He thought I had cheated somehow. I HAD NOT. I never got that model back after the teacher took it. Funny part - the teacher said - as soon as ANY toothpick breaks, we declare the test over. I told him - NOT WITH MY Bridge - Some of those toothpicks are in there to pretension the bottom chord. They WILL BREAK early on, but the bridge will continue to hold. It behaved EXACTLY as I predicted. The pre-tension supports did break early, but the bridge never failed. One of my secrets: I used to build model airplanes and knew it was CRITICAL to get the two sides of the bridge PERFECTLY FLAT and parallel in the final assembly. I also searched all over town to find the highest quality toothpicks I could find.
We did this about 20 years ago in shop class back when I was in middle school. My class got into groups, but I was not in a group for the project, so I did it alone. My bridge design got second place, I forget how much it held up.
We did this in Highschool 30 years ago. TSA. Technology Student Association. Had state and national conventions. We were limited amount of sticks also had height width and length restrictions. Had 2 hours to build. Also during testing they used a bigger piece of wood that would distribute the weight to the structure better. With only that small washer it’s mainly pulling in that small area. Watching sure brought back memories. 👍🏼
My friends and I once won the nationals in a year with TERRIBLE wood. Second place carried 15kg and ours did 72kg. We felt like the smartest kids in the country that day.
I was in a structural design class in high school back in 1974 where we had one of these competitions. Ours was limited to using toothpicks and elmers glue to build our bridges. I think the one thing in common was how much joy it gave our teacher, as each of our bridges failed.
1980 high school engineering class. We used 200 paper straws (available back then) and a tube of glue. my bridge held over 90 pounds. However my later catapult was a major failure. (much to the disappointment of a classmate who had signed up to partner with me thinking I would provide a great design)i
My father was a model railroader, HO gauge. He built a balsa wood a 4' long trestle bridge, true to scale. To test is he put 21 (6+5+4+3+2+1) cans of tomato soup on it ... didn't budge.
I think this test could radically change if you had wood timber that had joinery to tie the structure together. It is all about how things are connected first, then comes the engineering to spread the load.
i think it is not really a fair test since the mass of the weight was right in the center of the bridge. It'd be interesting to see how the bridge would hold if the weight of the mass was distributed more evenly as how bridges are used in the real world.
Dude, didn't your teacher taught you that the load must be put ON the nodes and not on the bars? Putting the load on the bar you are basically relying on the strenght of the bar itself!
I don't want to be rude, but the bridges seem to have poor efficiencies. The bridge at 1:32 held a decent bit of sand, but it apparently weighed 30 (I can only assume grams) I might be mistaken but it didn't seem like there was very much sand in the bucket.
this is a little irrelevant but my physics buddy took the sticks used for bridges, made a plane out of it, strapped his brand new iphone he got that day to it, and threw it out the window of the highest floor of our building.
I hate that they poured the sand "unscientifically"... would have been so much better if they measured the amount of sand, then listed how much each bridge held...
This is dumb, they all break after the first bucket so why in the world wouldn't you use smaller weights so you can actually see the difference in what they held? All that effort and he just wrecks them with no actual control or science involved.
Bro I have to build a bridge from one table to another and tha gap is long, short bridges are easy like those but I AN 11 YEAR OLD LITTERLY HAVE TO DO DOUBLE THE LENGHT of that bridge
![CONCURSO SPAGHETTI BRIDGE 2019 en UAH - Concurso Puente de Espaguetis [Real Poly Bridge 😀]](/img/n.gif)
The made us wear safety goggles when handling salt water but you're fine with flying sticks.
孩子，你要学会自己打破0回复
Best practice isn’t always practical. Especially when the football program got the money.
The problem was with your program not theirs
I once built one from toothpicks in College for an intro to architecture class ( I was in Engineering school)
The teacher brought a bunch of weights for the test (like above).
They saved mine for last (it looked the nicest).
It was able to take ALL of the weight the teacher brought and ALL OF THE TEXTBOOKS the student had brought to class and STILL did not break.
The teacher stopped the test before it broke and "confiscated" the model to investigate.
He thought I had cheated somehow. I HAD NOT.
I never got that model back after the teacher took it.
Funny part - the teacher said - as soon as ANY toothpick breaks, we declare the test over.
I told him - NOT WITH MY Bridge - Some of those toothpicks are in there to pretension the bottom chord. They WILL BREAK early on, but the bridge will continue to hold.
It behaved EXACTLY as I predicted. The pre-tension supports did break early, but the bridge never failed.
One of my secrets: I used to build model airplanes and knew it was CRITICAL to get the two sides of the bridge PERFECTLY FLAT and parallel in the final assembly.
I also searched all over town to find the highest quality toothpicks I could find.
We did this about 20 years ago in shop class back when I was in middle school. My class got into groups, but I was not in a group for the project, so I did it alone. My bridge design got second place, I forget how much it held up.
We did this in Highschool 30 years ago. TSA. Technology Student Association. Had state and national conventions. We were limited amount of sticks also had height width and length restrictions. Had 2 hours to build. Also during testing they used a bigger piece of wood that would distribute the weight to the structure better. With only that small washer it’s mainly pulling in that small area. Watching sure brought back memories. 👍🏼
My friends and I once won the nationals in a year with TERRIBLE wood. Second place carried 15kg and ours did 72kg. We felt like the smartest kids in the country that day.
I was in a structural design class in high school back in 1974 where we had one of these competitions. Ours was limited to using toothpicks and elmers glue to build our bridges. I think the one thing in common was how much joy it gave our teacher, as each of our bridges failed.
1980 high school engineering class. We used 200 paper straws (available back then) and a tube of glue. my bridge held over 90 pounds. However my later catapult was a major failure. (much to the disappointment of a classmate who had signed up to partner with me thinking I would provide a great design)i
This would have been lots more fun to see how much weight each design held, and who won. As it is, it told us nothing interesting.
It also didn't lay out what the rules were and what the criteria were to win. Could have been so much better.
Hey look they turned poly bridge into a real thing
damn dis shit crazy
I too would like to have a little more information other than just watching you destroy the bridges.
We did this also in middle school. A few years later a bridge was built over a river not to far away with my same design. I was never given credit.
Yeah I doubt they're gonna use a middle schoolers design to hold people up. Unless you copied bridges that is already proven to be trustworthy
You are hereby credited with a the design of a bridge, go forth and cross.
My father was a model railroader, HO gauge. He built a balsa wood a 4' long trestle bridge, true to scale. To test is he put 21 (6+5+4+3+2+1) cans of tomato soup on it ... didn't budge.
I think this test could radically change if you had wood timber that had joinery to tie the structure together. It is all about how things are connected first, then comes the engineering to spread the load.
You're right, its the connections that failed, not the members
We did this exact design project in Junior High, I was 13.
i'm doing this project right now, I'm 14
@@Gizmos_and_stuffdoing this rn im 17
@@uhhranz how's the project going?
Doing this as a freshman in Engineering School, I’m 19
@@ImTheReverse Better late than never.
he has a Godzilla complex
Lame! Didnt even do the obvious of telling us how much weight bridge could hold before failing
Should be using a load cell to see how much weight each design fails at.
The trick was soaking the wood in watered down glue overnight before building it.
Obvious design flaw at 2:57. Missing lower chord at mid-span on both trusses -- right at max bending moment.
i think it is not really a fair test since the mass of the weight was right in the center of the bridge. It'd be interesting to see how the bridge would hold if the weight of the mass was distributed more evenly as how bridges are used in the real world.
What good fun.
One time we were testing a model bridge and we eventually ran out of weights, there was about 300 pounds hanging off of it
I feel a arch here would be incredible but I'm not sure on the constraints placed on the builder
An arch would work if the joinery was better, the structures break at the joints not on the members
Doesn't seam like the kids were given the parameters prior to the test to properly build the bridge to carry the load at certain presser points.
Why didn't you show the weight
1:32 How many cm is the bridge span ?
352 meters
One of my 7th grade classmates made a bridge that didnt break...it held over 250lbs.
Safety first Eisenstein
Dude, didn't your teacher taught you that the load must be put ON the nodes and not on the bars?
Putting the load on the bar you are basically relying on the strenght of the bar itself!
I don't want to be rude, but the bridges seem to have poor efficiencies. The bridge at 1:32 held a decent bit of sand, but it apparently weighed 30 (I can only assume grams) I might be mistaken but it didn't seem like there was very much sand in the bucket.
Is it really in the structure or in a STICKS used in experiment?
line bender both
How much does each bucket of sand weigh
1000
@@mark92941000 what? apples? bananas?
It's not possible for the structure to be stronger than the material
Careful - you're competing with Kamala for meaningless statements there!
this is a little irrelevant but my physics buddy took the sticks used for bridges, made a plane out of it, strapped his brand new iphone he got that day to it, and threw it out the window of the highest floor of our building.
They need that price is right you lose sound.
I hate that they poured the sand "unscientifically"... would have been so much better if they measured the amount of sand, then listed how much each bridge held...
looks like 1:32 was the best.
Somewhat 1st
bridges
It doesn't look like testing, it's intentionally breaking,.
That's the joy of it
Not very scientific. Much of the strength in such structures are in the joints.
Tension designs using compression materials , bound to fail.
It's wood, not concrete. Take a trip to Vermont sometime.
Last first first last first last first
Dumb test. Why not use metal and curves and proper welds? Lack of imagination here...
This is dumb, they all break after the first bucket so why in the world wouldn't you use smaller weights so you can actually see the difference in what they held? All that effort and he just wrecks them with no actual control or science involved.
Heyyyyyy
first
no one asked what grade your in
@@switchtrackrailphotos5702 ??????
"first" 🤓
1st like
First last
Wow if these kids are the reason America is falling apart just there no learning wow
They're definitely not understanding physics if they're yelling "pour faster".
Bro I have to build a bridge from one table to another and tha gap is long, short bridges are easy like those but I AN 11 YEAR OLD LITTERLY HAVE TO DO DOUBLE THE LENGHT of that bridge
how did u do? can you share the design
@@franciscogonzalezjejj did you know what my teacher said never happened we just had to make from one chair to another
@@rafiqstarline and what was the distance then
@@franciscogonzalezjejj yea I need to wait on Wednesday or next Wednesday than I would know but it's around forgot