how-to-make-a-nasa-cia-flying-saucer-jets - physics demonstrations

Notice notice notice notice notice it's been watch it notice notice notice notice Notice it's been let me approach ordinary I put a stick in this corner here and I spin it so I say that in this position the moment of inertia of the pipe plate with respect to this access of rotation is very large I give it some spin energy now what do I do I slip the stick into the middle of the disk and a wonderful thing happens watch it Well, fellow can lose his professional dignity here There it is and the wonderful thing is this that however I inclined the access the the shaft the disk remains in motion in the same Original horizontal plane look at that and notice how long the spin life because I have given it and the norma some out of kinetic energy of rotation Now as I approach the sphere with the dog an interesting thing happens watch it watch it notice notice notice notice notice notice it spins let me approach listen How do you do ladies and gentlemen and boys and girls I'm Julia Sumnamilla and physics is my business and more especially this hour the physics of toys again with which we have fun abundant now I call to your attention I have done some things with mechanical toys some things with acoustic toys some with thermally excited energized toys Now some electrostatic toys a wonderful thing to witness here is a little box made of clear new site on the top with a cardboard bottom and in the box I have large some little figures in the shape of of human figures made of paper now what am I going to do I'm going to stroke the top of this box ever so briskly but likely with the flesh of my hand and watch There they are dancing devils Now some are sticking here and I want to know why they do that look look at those little rescues Look at that here is one of the same same substance really Oh look at that now watch I'm going to put my finger on the upper surface here and this little rescor down there can do many things he can drop down sort of dead or he can flip away to another place on the underside of the cover watch Oh well oh there that one did it let me show it to you again watch Oh that one right and the exploration of this would take a good half hour an electrostatic toy Let's look at a magnetic toy here is an iron frame work iron it has to be magnetizable stuff It could be iron nickel or coal ball Question could it be stainless steel answer no stainless steel is not magnetic which is a very interesting thing and here is a little blue sight wheel which has an axle And the axle is chronical shaped on the very end chronical shaped quite like this So somebody says what are you making so much of this professor well That's the chronical shaped Why The physics quite profound now what do I do I lay the wheel on there? Now what I'm going to do is the following I'm going to put this inter motion mechanically down up down up now I am in resonance with the moving of the wheel up down up down up down up down up down up down up down up down up down up down up down up down up down up down up down down Not quite not quite now the beautiful thing about this is this here is an open end and the wheel is held there magnetically at that open end Very amazing problem because the magnetic force must be enough not only not only to hold the weight of the wheel but to provide the central force necessary to bring it around and up the track again Or consider this magnetic toy here is one that is absolutely a killer to contemplate here is a little hollow sphere Which is loaded in the bottom with a little magnet and you notice that mechanically it's very stable because it has a very low center of gravity Now here is a little dog the dog is called the abundant the wonder dog a red one a white one a black one Now as I approach the sphere with the dog an interesting thing happens watch it watch it notice notice notice notice it spins let me approach another sphere with another dog Notice this one goes away the first one came toward me question what's going on here well I discovered what's going on by breaking away the front feet of the dog and I found large in the front feet a little magnet and the question is how must this magnet and how must the magnet in there be polarized in order for these to do what they do And in order to study that here's what I did I took a ping pong ball cut it into put a little tacky wax in the ping pong half ball and then a little I'm sliver which I magnetized in a very special way and you watch I'm afraid it may be too to a rough here, but watch Yeah, I get a little turning and so I have explored it in this way in order to suggest to you how a study would be made of something you don't understand The electrostatic magnetic one more one more wonderful thing classic a little chamber empty no no no not empty filled with air I put on a pumping mechanism and I pump it up now I have a question to ask which which many fall down on consider this to be a rocket and supposing I have some stuff in here as I like to say in a state of combustication or somebody says now professor you know there's no such word well if I want a word I make it I don't like combustion it's too quiet I have some stuff in a state of combustion the gases from this combustion image I ask don't the gases coming out here need the air to push against this to go and many people think that is so and then I say let us pray because that is all wrong this thing works best whether is nothing because we want the gases coming out there to have the most stuff and the largest velocity in order to have the greatest change of momentum so don't don't ever think that the gas is coming out here need the air to push against for this to go now I pump this up I am putting more and more molecules of air into this chamber I remove the pump mechanism the gases come out this way and this vehicle goes the other way and I'll ask my man out here my man Friday to catch it there it is there it is the vehicle went question this is properly designed to put some water into question how much water and how much air should you put in in order to have the maximum efficiency and this is a very difficult mathematical problem to engage in next problem toys mechanical I have here little toy duck on a string see there's a duck on a string so I call it a toy duck on a string and now now you have to get a long shot of this because I want the whole thing seen and here's what I'm going to ask let me hold the upper string at one position see it fixed on the top of my head and I'm going to pull down on the lower watch it pull down I pull down on the duck went up now I'm going to hold the lower hand fixed on the table and I'm going to pull up watch what is going on I can I pull the duck up my pull down or do I pull the duck up by pulling up in short I want to know what is the mechanism inside this toy duck that makes him do what he does or consider the classical business of the dunking duck that is hardly ever understood but I'm going to try to explain it quickly why does he do what he does and so he has a long inside his middle shaft a tooth a tooth he has some volatile liquid in his belly I have where it is head here in this glass of water now there is a vibration from his head evaporation is a cooling process where upon the vapor from inside his belly which has come up into his head condenses in this core region into the liquid state makes his head heavy and down he goes but when he gets down the liquid runs back to his lower part where upon he is lifted up again and this is the mechanism by which he works finally the case of and I'll have to step out here to do this I guess the case of the spheres on the strings two rubber balls on two strings and I trusted for you there you have one going clockwise now watch it there we are and the other one is going counterclockwise and I say that in order for this to be done my hand must execute simple harmonic motion while the spheres themselves execute uniform circular motion and thus I have mentioned the physics of the two balls on the strings and I thank you for watching thank you