Scaling Up Centrifugal Forces On A GIANT Sit n Spin

yes,

spin

,

spin

, in today's video we are building a big sit and spin. Well, this is our sit and spin and now we have a big one. I fit into this one. You have a good swell, by grace. This is a little more. the small side just a little bit she can use it much better than me, but not yet, it's not perfect yet, there it is, yeah, so we have a small one, we need a big one, we're going to try to build a big one. Sitting spin for us to play because it sounds fun.

I think it's great. This is the basic idea: we are going to build a great sit-and-spin. Take a look at its mechanics and how it gets its spin. Let's explore some different

forces

, I think it's best if we start by taking this apart and getting our circles so we know, so why take this apart if you want to cut out our circles to sit and spin because it has this circle? at the bottom and then you have this larger circle at the top that rotates, um, we need two of these two of what two circles, yeah, then another one for the top, yeah, okay, so a 30 and then we have a Lazy Susan piece bobber hard hardware which is the word we're going to use as our ball bearing system that has and you wanted the entire seat to be 30 inches wide so we'll have like three extra inches beyond the diameter of the hardware all the way around, which is It's going to be a lot of fun, cool, so while Nate does that, I sketched out the physics of our device that we're playing with and I sketched out what Nate needs to do so we can talk about how it all works .

It works as a large system, so to understand the mechanics of our sitting and turning we need to look at centripetal and

centrifugal

force. Centripetal force is the force necessary to keep an object moving in a circular path and in an inward direction. Centrifugal force, On the other hand, it is an apparent force, which means it is not real, it is the force felt by the object moving in a circular path and acting outward from the center of rotation. Now if I want Nate to be on a circular path then we need to use a centripetal force which means he has to hold on to the handlebars and that will keep him with a point of contact moving him in a circular motion so as Nate moves in a circular path, you will have a force that will make you feel like you are flying and moving in a straight path which is a

centrifugal

force, so when Nate, let's go, bye, Nate leaves because a moving object must stay in movement, so when we're in shipping, turn.

We are experiencing both

forces

, a real force, the centripetal force, and an apparent force, which is more or less a false force, okay, let's get spinning guys, we have a 3 4 inch piece of plywood and this is what we are going to use. To build our device, this is what you would use on a Lazy Susan to make it larger than life. Lazy Susan, but we're going to use this as a ball and bearing system so we can spin, as you can see the one I have. like held against my back the inside doesn't turn the outside so that's going to be cool I'm excited I'm building a string compass to make our circles so we're going to have a marker and then we're going to put the string in the center and we use it as our pivot point to draw the circular pivot.

I want it to be 30 inches in diameter, so I have a 15 inch rope here that will be the main base, the part that I sit on. We also need a hole in the center for the control mechanism which is the tower sticking out of the light green part in our toy version. We're going to use some ABS plastic and our 3 inch ABS plastic tube will fit into this. flange, then I need a circle the size of this base part of the flange also marked because we are going to have to cut that hole in the center to make it that size, this is almost four inches, so if we have a four inch hole that would work great, we would barely have room to get this over, which is what we want, we don't want a lot of room, we just want a little bit, so while Nate is doing his little loops and making circles, I'm taking this apart so we can see inside because here There are some very interesting and unique things going on so our hardware ring will fit in there, so I wanted the ring to be centered and inscribed on the inside. our largest circle, so I already had the center point marked, so I measured the diameter of the ring, divided it in two to get the circumference, measured that point from the center, drove a screw into the center and then wrapped a rope around it from that point. and I tied it pretty tight, which gives me a radius of that distance in a loop, so I think it should work pretty well while Nate draws those circles, we're going to look at our circles here as we sit and spin, so this is the part where you sit here and when you lift this you get this you actually get this ball and bearing system that's here and they just come out so people have created them online using marbles you can do that or you can just do what we did us and buy a Lazy Susan Spinney Mabobber hardware, but yes, this is really unique, this is what gives us essentially creating a frictionless area that we can slide on and spin on what we feel when What we are spinning on These surfaces are those centrifugal and centripetal forces that we talked about before and that are very important in physics and it's something that we are experiencing and children are experiencing from a very early age in these thin spins that we want to see. if we can move our inertia and spin faster if we're sitting on the outside of the sentence bin or if we sit closer to the center of the sentence fin, that's something we're going to try on our biggest Sit and Spin because, frankly , we don't have enough room in the small seated turn to get closer or further away.

I'm learning something new. Looks like I'm still training. I learned how to use a circular saw the other day. No. an angle grinder now we're learning how to put ab cement apparently there's a technique to it yeah and it's going to be the same thing you do with other types of pipe glue so I'm going to ask you to do it so come on. over here, so the inside of this is going to be a little foam ball, so what you're going to do is okay, you can take that and you're going to paint the entire inside of this ring.

Good, now you should feel. in your mouth and nose, can you get into that? No, it will catch up with you. It will be very similar to the dentist's office. It has something like a numbing tingling like the glue they use, all over the inside. of this and then the outside of this and then you're going to press it and turn it 90 degrees and that's good, wow, that's fun, come on, it works, yeah, it works, oh yeah, grace, are you there?, yeah, I'm here, can. I feel it in this one, I don't feel it as much in the little one in this one, I do feel it pushing me and wanting to get rid of me, that's why it keeps wobbling, yes, all your weight is on one side, yes.

I'm going to turn it in a different direction, dizzy now it really is, it feels like my body wants to turn around on itself. You are doing it very well. Turn me around. How does it feel strange? It feels like you are turning over on yourself like when you go to bed. like you're going backwards, Nate, and I was holding on to this center post stretch, he doesn't have that ability, his arms can't reach it, bad stretch, so when we spin him around here, he should if the physics works correctly. we are going in a straight line and we are not continuing around this circle so we will make it spin, there is not enough force to deflect it, if we spin faster it can continue traveling in a straight line because it has nothing holding it down to keep it in that circle. centripetal force of circular motion, that's all we have for you today.

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