Let's find out, grade 2; Tops

Oh. Now when my two boys and girls to listen I love your son's wedding brings you another spying program. And oh wise and girls. Today we're going to talk about tops that spin. Are you ready. Mr. Spinner and Mr. Turner you have some hard work to do. Are you ready to do hard work. Good. Have you ever watched a top spin round and round until it fell over. Have you ever wondered just what made it fall.

I've kept well not been for a long long time will it. The top will fall over when it begins to run down. Go slower. Let's see if we can find out why it falls over. Mr. Spinner. Find a cardboard disk. The big flat circle of cardboard. Is it cracked. Be sure it's not bent. Are folded. Lay it down flat on the table and see if it is as flat as a table top. Is it good. Now listen carefully. Pick up the cardboard bins and stand it on its edge hold it still if you got it standing up on the end. All right now take your fingers away. Repeat all over it. Goals it won't stand on its then

and you will it. How can we make it stand up. Do you suppose. Do you think that if we spin it it might stand up. Well let's try. Mr. Spinner pick up the disc again and hold it on its edge. Put your hand on the top. Now the part that's up on top. Now twist your fingers and give it a spin. Did it's been for a few minutes a few seconds. Well try it again. And while it's spinning. Watch it. Did you get it to spin. Try again and see if you can get that cardboard to spin. Just a few times anyway. They did span. Now while it was spinning did it stand up on the edge. It should have. The cardboard stood up only while it was

spinning around didn't it. All right put the cardboard down and let's try something else. You can play with that one. After a while. Mr. Turner when you pick up the coin the piece of money. It's a flat disc too isn't it. It looks a little like the cardboard that Mr. Spinner used. Now I don't know what kind of a coin you have and maybe a nickel are a 25 cent piece or half a dollar. But anyway you pick it up and see if you can make it stand on its edge. Try it see if it will stand up on edge. Sometimes we can make a coin stand up on its heads but that's pretty hard to do when you make it stand up on the edge. Keep on trying little stand up. All well never mind. Let's see if the coin will spin

and stand up on its head a little better than the cardboard disc did. Now the coin is much smaller than the cardboard disc and you might have some trouble making it spin but if you're careful it will spin for a longer time. Let's try this turn or stand the coin up again on its edge and hold. Hold it near the top with your thumb and finger. Now twist it fast and let go. Then it's been well try it once more. Spin it again. It has been this time. Well now I wonder if you were having trouble your teacher may be able to make the cawing spin for you maybe her fingers will work a little bit faster than yours. But then you can practice after a while when you do that. All right teacher if you're having trouble making that kind spin when you try it for us

please go ahead and spin the cawing. Who did the coin spin longer than the cardboard did. Has it fallen over yet. Well even if it hasn't stop it please. And let's ban it again now this time. Watch it very carefully what happens when it begins to spin lower and lower. All right. Keep on spin it now. Is it spinning or I watch it now. What keeps that kind being as it spins lower and lower. Something happened to it. It gets flatter and flatter doesn't it and then finally it's down flat on the table and it's not spinning any more. All right let's stop spinning that kind a minute and think what made the kind spin in the

first place. What did you do it do to it just started spinning. You pushed it didn't you. You really did with your fingers. It turned around when you gave it a push. All right. Now are you ready to try something else. Put the going down on the table. Remember how the cardboard and the coin spun around and finally stopped. Mr. TURNER. Are you the boy who can spin a real tap. Well good for you I hope Still if you're not. I wish the boy who can spin a real top would come up to the table now. Pick up your top and will you wind the string up please around the top. Now watch what Mr spinner is doing boys and girls if he got the string all wound around there all right are you ready now.

I guess we better ask you to spin the top on the floor. Can everyone see the floor it must've been his feet. If you can't move just a little bit quickly now. All right now can you all see the floor at Mr. Binnie feet. All right Mr. Spinner. Man your top. Is it spinning. If it is watch it carefully. If it didn't spin that time tried again. Wind it up if you need to but watch it while it's spinning. See how straight it stands at first while it's going fast. Then as it slows down. See how it tips over and sort of wobble back and forth and finally goes slower and slower and then bang over it goes. Now if you don't get

your top spinning try again after the broadcast would you. And be sure to watch it as it slows down when you do that. Maybe you saw it right now and maybe you had trouble getting it to spin but you can do it after a while and you can watch it very carefully now. Have you got another put the top down for now Mr spinner. Even if you didn't get it to spin put it down and you can try this later. Now have you got another kind of top there. Some of you may have a top that is run by a spring the kind that you wind up by pumping up and down with a rod through the center of the top. If you have one of that kind will Miss Turner hold it up on the table. Try to stand it up straight and let go of it. Missed your inner group your own stand alone will it on that little point. All right now Mr. Turner spin the top. Go ahead pump it up and down and

spin it. Is it spinning. Is it standing up as it's been. Now watch it as it slows down. Sometimes cops that are run by spring we run a long time before they slow down. But let's watch this one now and when it spins slowly enough it will fall over won't it. Well you keep on watching it and while you're watching let's think let's think about this for just a minute. Q. What keeps the top standing up straight. I hope you were right. It stands up straight only when it's spinning fast doesn't it. That cardboard disks stood up when it was spinning. The Korean stood up when it was spinning. Mr Spin his top stood up too. I wonder if you know who I.

Where maybe you do and maybe you don't but since you're a scientist you want to know the very right words to call all things won't you. More I knew you would. What do we call the force that holds everything against the earth's surface instead of letting things through I often does space. Do you remember. Well do you know what it is that pulls a ball back to the earth when you throw it up in the air. What pull you back to the ground or the floor when you jump up. I wonder if someone said gravity. Well good for you if you did gravity the pull of the earth the force of the Earth pulls things toward the earth. If you throw a ball in the air away from the earth it will fall back again won't it.

And if you stumble. Gravity pulls you down and you fall. Gravity is the name of the earth. Cool. What made the cardboard disk fall over. What made the coin fall over. All right and the top two. But when the top is spinning it doesn't fall over. Now the reason that caps stand up straight when they are spinning is that this spinning gives them a force that pulls away from the Earth's gravity. That force of this spinning top is called. Now listen carefully. Stand true for gold or try to say that word Listen first send traffic on San traffic go for. All right. A spinning top has some trickle or

no you know why a cop stands up on a small point only when it's spinning fast don't you. Well now when you try to spin those props and when you think of those two words you learned today. All right bye. And now to Reggie Knight in the studios of St. Louis more of Education radio. This is the end i.e. Radio Network.