 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is test the strength of paper. What you need for this experiment, of course, paper, tape, books, marbles, and a jar or a cup. All right, so in this video, we have two different experiments we're going to do. We're going to test the strength of a piece of paper, a single piece of thinner paper, right? And so the first one is we're going to just put it down and make it into a bridge and then see how much weight it can support and then do different experiments with that to see how they, how we can increase the weight it can support. The second one is I took a piece of paper and I folded it into a square, a triangle, and a cylinder. And then I'm going to take some books and I'm going to stack them on top of these to see which one of these shapes can support more weight. And then I'll tell you the science behind that. This is the first of two experiments. So this one is how much can a paper bridge hold in weight. So I'm using marbles and I'm going to use that plastic cup to put on top. So basically put your books apart and put your just a regular piece of paper, printer paper and put it on top there. And then as long as the cup can fit all the way down. And then we're going to start to our test. So we take one marble at a time, as long as they're all the same weight. And you can see it doesn't even support one marble. So it kind of pulls in right away. So what I'm going to do is fold the paper in half twice. So it's got four pieces and I put it on top. And I got one, two and three and it looks like four. So it's going to hold three on that one. So I'm mixing things up a little bit. This time I'm going to take the piece of paper, a regular computer paper, and I'm going to fold it up multiple to different times, but fold it not just once or twice, but maybe five or six times all the way across to see if there can be support more marbles. So there it is just like that. Same single piece of paper and I would make a prediction to see how many you think it's going to hold. So right off the bat I started with two and then it was not balanced right. So you've got to really make sure your papers folded evenly so it can support the cup. And as we go through I'm going to fast forward this so you don't have to do it. So but if you want to count the marbles you can slow down this video and count them yourself and I'm going to give you the totals at the end when I get there. So here it is in fast motion and I will continue to add these up for you. You could see that the the broke paper broke down where it's folded a little bit but it's really supporting it still and it's not even giving in. And here we're at 20 marbles and still going. It's starting to bend about 24 and as we start to go you can see it's starting to go it's getting there and we're coming to the final end before it breaks and it looks like we're going to have 36 marbles and 37 marble broke it. So this time I folded it 12 times so twice as many as last time and we saw that it's holding more with this. So go ahead and make prediction how many marbles it's going to hold this time with 12 folds and we pretty much should see more because we saw a lot more with six folds and so I think it's going to probably be the same. I've got this in fast motion you can slow motion if you want to see the count but here's the total we ended up with 57 marbles it broke right in the middle there and it pretty much doubled almost doubled the numbers. So here's my two different designs six and 12 folds and 12 folds was so the second experiment here is with columns and so we're going to start off with a square and we're going to make a prediction on how many books it can support. So go ahead and pick those there's one I'm going to speed this up into fast motion two three four five and switch sides here six seven eight nine ten and the 11th one broke. Okay test number two is the triangle two not one book let's try it one more time just to make sure I didn't do it wrong right one book okay so here's the last one here we're doing the cylinder so I'll speed this up in fast motion and you can slow it down if you want to look at it and it'll keep totals as we're going but you can see it already is surpassing both the triangle of course and the square as it can support so much more weight as we're getting close to the end here so there's 24 25 26 books when it fell 25 books is supported which is a heck of a lot more than the triangle which didn't do hardly anything and the rectangle so okay the science behind these columns in the books are with the shapes so the the square of course has four sides four walls the triangle has three sides and three walls and the cylinder has one wall one side right so when we're doing a test on strength we have to stretch that weight all the way across all the sides and unfortunately these two here the square and the triangle have edges and so this one has four edges and this has three and it cannot equally distribute the weight throughout the sides and therefore doesn't hold as much where the cylinder only has one wall and no edges so therefore when you stack the books on it can evenly distribute all the way and therefore hold more books than the other columns please try this at home leave in the comments below how many you've got and thanks for watching and please subscribe and click thumbs up