 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is how to roll a funnel uphill with the help of Senator Gravity. What you need for this experiment is three books, two funnels, two pieces of wood. I use a yardstick, some tape, or a glue gun. All right, welcome back to Kids Fun Science. So this experiment, you need two funnels and then you're either going to have to put them together. I got them at the dollar store, so very cheap. You're going to put them together, so you either have to use a glue gun or you can tape them together, any kind of tape. As long as they're put together and the funnels are going out like this. So that's the setup. So the setup on the table is you need three books. You need a thin book, a smaller book on one end, and then you need two other books that are a lot higher. Now I'm using three yardsticks. That's only because I'm doing an experiment at the end. You do not need three. You only need the two yardsticks and make it into a V shape where the higher end has the V out farther. The experiment is going to cover the center of gravity, right? So the center point of an object, right? So here I have yardsticks and a couple books. As you can see, I have a lower end yardstick here, and I'll show you in a bit, a lower book here, I mean, and a larger book over there. So the yardsticks go all the way up. So we have the yardsticks here, and they're about three feet long, about 0.91 meters, so almost a meter long. And I have a small book on one end, and a large book on the other end. So you ever hear all things roll downhill? Well, that is true, and I'll prove it. But in this case, it's going to show you that they roll uphill. So when we place the two funnels in between the yardsticks, they roll uphill, just like that. So to measure it here, so you can see that it's lower on this end, it's two and a half inches around 6.5 centimeters on the bottom part, and then it's four and a half inches, so two inches more, about 11.4 centimeters on the top part. So when I let go of the fun on the lower end, it seems to roll up the hill, which is pretty awesome. So the science behind this is when the funnels are glued together, the center of gravity is directly between the two wide openings. When the funnels are placed on the yardsticks on the table, they begin to roll because the center of gravity is going down. As you can see, the funnels go below the yardsticks. The yardsticks allow the center of gravity of the funnels to go down as the funnels travel up the yardsticks. The funnel shape causes the optical illusion as it appears to be rolling uphill, even though the center of gravity is actually rolling downhill. So it does fit all things roll downhill, even though it looks like it's rolling uphill, because the shape of the funnels. So the key to this experiment is the shape of the funnels, the V shape position of the yardsticks, and the object center of gravity. This concept, after I show you some of the experiments I've done, I came up last night and I started thinking to prove that I don't have the table lifted or something trick. There's no trick. This is science on how I do this, that I was going to show you that it does roll downhill at the same time it rolls uphill. And I'll show you that right now. So I'm taking my funnels and I'm putting them right here, and then I'm taking this tape and I'm putting it right here. And when I let go, one comes down and the other one's rolling uphill. So as we know, all things roll downhill, you saw the tape was rolling down, but the funnel was rolling up. So I don't have the table any angle or anything. It's just straight on the ground and it's pretty incredible. And I'll do that one more time. It's pretty awesome. And I'll explain the science behind it. Here's another visual here showing it the lower end. I'm going to mark this and show you how high it is in the center of gravity right here. And then on the other end, you can see it's below. So it's actually, because of the funnel shape, it actually goes downhill and that's why it rolls. Here you can see it's not, you can't see the funnel, but as it rolls down, you can see the funnels, therefore the center of gravity is going down. Here on this shot here is from the other angle. You can see the lines eventually were started on the yard sticks when I only have two of them. And then as it goes out, it doesn't have the lines anymore. This is going uphill. I hope you enjoyed this experiment. If you did, remember to click thumbs up and to subscribe as I put a new video up every week. Thanks for watching.