Design & Build Paper Bridges


Hi I am Jared welcome to FunScienceDemos. You know we use science and technology to solve problems and today we are gonna take a look at a problem. Our friend Norbert has to cross this river
How can he do that. Well let us take a look and see what would happen if he tries to jump across our river. Are you ready Norbert I think he is ready. Let us see what he can do He is gathering up speed… and it did not work so well. But I think we can use science and technology to help Norbert with this problem. So how do you think we can get Norbert from one side to the other. I think we can design and build
something and scientists call that when you design and build something
engineering. So what do you think we can design and build that will get Norbert from here to there. I am thinking that we can build and design a bridge. Now it may
not work the first time and we want to keep Norbert dry so that means we might
have to redesign and rebuild but that is all a part of engineering. Now to build our
bridge we are going to use ordinary paper. Let us see what happens when I put this
piece of paper over our river. It looks like it is going to stay but what will
happen if I put Norbert on the bridge. It is not strong enough. So I am
going to have to redesign and do something to this paper. I am going to have to change this paper to make it stronger. We know that folding a piece of paper
actually makes it stronger so we also want to keep Norbert safe and we want to test our bridge that we make and redesign and make again and to keep Norbert safe we are going to use pennies instead of Norbert. So we are going to start with two folds I am going to fold
each long side of the paper to the center. Here we go! One fold two folds and now let us see and test to see
if this bridge became any stronger so we are ready to test our first bridge. Now
we set our bridge up so that it is about an inch or a few centimeters onto each
book and we have actually folded the front edge of our bridge down so you can see the pennies that we add. Each penny is about two and a half grams that is going to
help us test how strong our bridge is. So now we are ready to add pennies. We are going to
stop when our bridges is not straight across anymore. Here we go one penny at a time: 1, 2, 3, 4, 5, 6, 7, 8 ,9 See what is happening to our bridge 10, 11, 12 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, and our bridge collapsed 24 pennies but still pretty amazing considering this piece of paper could not
even hold one penny when it was not folded. So I think it is time to redesign
our original build. Let us see if we can make it stronger if one piece of paper could hold 24 pennies I wonder what two pieces of paper could hold. How do we figure that out We have to test our idea. Let us put two pieces of paper together, set
them up on our bridge and start dropping pennies so we folded down the front edge of our bridge so you can see how many pennies we put on and remember we have two
pieces of paper. So how many pennies do you think this bridge will hold? Do you
think it will hold less than 24 pennies, about the same amount or do you think it will hold a lot more than twenty four pennies. The only way to find out is to test our
idea. Here we go! 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, we reached our 24 point. It looks like it is holding 24 let us see
how many it will hold now if we keep going 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 61, 62, 63, I think I am going to need some more pennies 64, 65, 66, 67, 68 68 pennies think about that Look at this our bridge held 68 pennies
Now remember our one sheet of paper held. 24 pennies and you would think that if I
added two pieces of paper that would double the 24 and make it 48 But this one held over twice as many pennies. I can make my bridge stronger by adding
another piece of paper 24 pennies with one piece of paper 68
pennies with two pieces of paper. Now that see how many pennies we can get on
three pieces of paper for our bridge (Counting….) (Counting…) (Counting…)130 pennies do you think
Norbert will be safe on that kind of bridge. So before we test Norbert on our
bridge let us stop and think about what we did we folded a piece of paper and we only used one type of fold. Do you think there are other types of folds we could
use to test how strong paper is I really think there are. Take a look at this. We could do lots of different folds to make our papers stronger and in fact
scientists use this simple design in things all around us. Things like cardboard things like plywood let us take a closer look at these and see the same
design in plywood and cardboard. Take a look at this piece of plywood now keep
in mind engineers use plywood to build all kinds of things like houses but look at the design in this plywood. They used layers of wood
to make our plywood stronger just like we use layers of paper. They used five
layers we used three. Can you imagine how strong our bridge would be if we used
five layers of wood making it really strong. 1, 2, 3, 4, 5 So plywood used layers to make it stronger cardboard actually uses this design to make it stronger. Take a look at the side view of this
cardboard. Can you see the folds sandwiched in the cardboard Up and down up and down up and
down. Look at the design and a simple piece of cardboard all of those little folds actually make this cardboard stronger. I think it is time to test our
bridge and see if we can keep Norbert dry. Are you ready Norbert here we go. It looks like it is working. It took a lot of testing and
redesigning but that is all a part of engineering if you want to learn more
about building designing and engineering check out our links in the video
description. Science is so cool right Norbert. Right! Thanks for watching!

32 thoughts on “Design & Build Paper Bridges

  1. Great video for a teacher, consider editing the counting out altogether until you are closer to the bridge breaking

  2. hi im not on my real channel but at my school in science we were building bridges with paper only no tape no glue so the kind of bridge we did was an arch and truss with sucked that i was the only girl in the group so we just went with my idea >:) so we came 3rd place! 1st place got ย like 156 scissors on there pillar bridge 2nd place for 45 scissors and my group got 35! I'm getting an award tomorrow ๐Ÿ˜€

    YAYYYY i think were getting ice cream ๐Ÿ˜›

  3. I think the real engineering is when Norbert could pass through ONE piece of paper bridge. In real life, more paper means more resouces. An engineer must build something cheap, fast and safe for peoples.

Leave a Reply

Your email address will not be published. Required fields are marked *