Toy Physics--- tumbling toy -part 2 /// Homemade Science with Bruce Yeany

[@EmersonPeters]

I wonder if anyone else watches these for fun. They are quite interesting! I love how these toys are turning a continuous motion into a discrete one.

[@jianneperez534]

Thank you so much sir! You are making science enjoyable for most of us students who see it as a difficult subject to study. Thank you for your effort, I hope many teachers look up to you! :)

[@YeanyScience]

Thank you Jae, I appreciate hearing that it helps.

[@YeanyScience]

The physics of these tumbling toys are a bit simpler than the tumbling toys that work the way down the ladder track seen in my other video. Both are considered to be examples of a type of nonlinear motion. To understand it’s motion, the first thing to consider is the movement of a ball as it rolls down a ramp. You might want to research a bit about vector forces and look at diagrams of rolling objects. Basically a ball has both rotational motion in that it turns and translational motion as it moves downward. There is a gravitational force pulling the ball down the ramp causing a torque on the top ball towards the bottom of the ramp. The friction between the bottom of a ball and the ramp applies the torque that actually causes a ball to roll as it moves down the ramp. Without this friction a ball would slide rather than roll down a ramp.. Now consider the toy. With the ball inside the container there is a frictional force between the ball and the paper tube. The ball inside rolls down the inside of the tube until it reaches the bottom tube edge, the ball and tube both turn together and then the ball rolls down the inside of the tube again. It repeats this over and over. As you watch the toy roll, notice that the outside of the device and observe how it moves down the ramp. You’ll see that it is actually rolling and turns about it’s surface just like a ball does except that it’s movement is not a symmetrical motion due to it’s oblong shape. The ramp has a rough surface and in some cases, sand is added to the exterior of the toy so there is sufficient friction to rotate the toy, without enough friction, it would simply slide down the ramp on it’s oblong side instead of turning. The friction between the ball and the inside of the container also allows for sufficient amount of torque that causes the container to rotate with the ball when the ball is against the lower end of the tube. This becomes easier once the toy is in motion than on it’s first turn. As you may notice, the toy will continue to rotate a few turns even after it has reached the bottom of the ramp due to it’s moment of inertia.

[@phdtobe]

Bruce Yeany Also, since the diameter of the ball is smaller than they diameter of the inside of the end of the tube, the relatively heavy mass of the ball shifts the center of mass of the entire toy beyond the lowest point where the tube makes contact with the ramp. That imparts torque on the toy around that contact point down the ramp, helping to flip it end over end. But this CoG-based torque is probably small relative to the ball-rotation-baded torque. I'm wondering if you could devise an experiment to measure how much each torque factor contributes to the toy's movement down the ramp.

[@blouseparadise5208]

The most nerdy comment and reply for that

[@blouseparadise5208]

Who the hell asked about these paras

[@mynameiseilers]

I remember mini versions of these being sold when I was really little. I wondered how they work since. Thanks for fulfilling that thirst for knowledge, and great video as always. Keep doing what you do.

[@helpmenigga6426]

Stfu you gay kid.

[@Dari300ra]

i don't know how i found your videos, but i have to say as someone who is interested in projects to do with my 7 year old you're simple physic toys intrigue me and give me a good place to start with a good explanation of who to make them

[@shdsteel]

Love rewatching these now that I'm older. Science can do some amazing stuff.

[@YeanyScience]

I love doing it

[@joblessalex]

My favorite effect is actually at 2:29 when it falls. Note that even though the ball is way heavier than the plastic tube, it still falls at the same rate. The ball stays in the top until the floor adds an opposing force on the tube and the ball falls to the bottom.

[@YeanyScience]

thanks, I like that too

[@rawjatuladob3969]

সৃজনশীল কর্ম শিশুদের মস্তিস্ক বিকাশে অবদান রাখে। মহোদয়ের প্রতি অভিনন্দন ও ভালো বাসা অবিরাম ।❤❤❤

[@MrZgx10]

I remember a toy called "Mighty Beans" very well and this is what they were.

[@Dummythiccdakota]

Zachary Gustin was just about to comment the same thing

[@mmmmmmmmmmmmmmmmmmmmmmmmmm7165]

D3urke Dancer I was just about to comment the exact same thing too!

[@michalnemecek3575]

I'm late.

[@AaronDarden]

YES, I sure do

[@grayscale2355]

Zachary Gustin I was gonna say the same thing

[@212superdude212]

we have these in the UK but there a lot smaller than your version, we call them runner beans

[@jonas2431]

works like mighty beans

[@JohnJacobJingleheimerSchmit]

jonas martin That's exactly what I was just thinking!

[@igt3928]

A hollow ball filled with a viscous liquid with a steel smaller ball inside will roll very slowly, counter-intuitively. You can make a snail toy using it as a wheel.

[@ИванКопец-б6ы]

Лет12 было,когда увидел эту игрушку,а скоро бахнет 75!!!😊

[@elenalabrecque]

Professor Yeany, We tried making the tumbling toy (a bunny that you demonstrated). We used printer paper, and a couple of glass marbles, covered the surface with glue and sand. The tumbler tends to slide down, instead of tumbling. Is there not enough weight? How is the slide vs. tumbling movement related to the slope of the ramp? Thank you very much for inspiring a large community of scientists! Kinds regards, Elena

[@YeanyScience]

It is hard to guess the problem without seeing what you have, but since you say the tumbler is sliding, I'd guess there is not enough friction on the board surface. Try a rougher material on the board, either glue and sand or a rough material.

[@MrTwostring]

Ha - I recognize the opening music. I used it in my "swimming in Feb in a wet suit" video. I've been enjoying these videos - especially the do-nothing machines.

[@Kratax]

Would be weird if the toy just kept tumbling on, out of the house.

[@xForeverYoung17x]

Can you elaborate the concepts of Physics illustrated in this toy?

[@YeanyScience]

the explanation is posted

[@blokprintzprintwithpaint972]

Gradient v length of tumbler = a yummy graph. Might have application in slowing the descent of things.

[@ChrisPonate]

Would be Awesome to see how long of a tube you can use until it works no more. :)

[@macalisterjc]

intro from the acoustic letter?

[@TinuMehra]

Cute toys than the frst part🙂 Once again... Keep up the good work SIR😇

[@prorigami2444]

Your channel is amazing. I subscribed

[@YeanyScience]

thank you

[@taanisharora5577]

Which material is that?

[@swiftstar4786]

You should try and put honey or syrup in one of them so the ball moves slowly and then flips

[@michalnemecek3575]

You mean this? kzbin.info/www/bejne/baq9qJ1nZpaZlZY That could look cool.

[@monadtraders6656]

can u please tell me the scientific facts in this toy

[@easyphysicswithbanan2961]

The center of mass of the system (the tube and the ball) changes position. And once it is out of the small rounded base of the tube; the whole tube flips around.

[@mahiabir]

Can you make a Circular track and keep it tumbling for eternity?

[@YeanyScience]

that is a good idea, I will take a look

[@YeanyScience]

I found a slow moving motor, and a basket to try it in,

[@drexlermendoza5466]

Hi sir yeany!May i ask why does the second version that i tried to make does not stumble at the board but only stumbles once when it reaches the eng of the board?

[@drexlermendoza5466]

Or does it depends on the angle the board was put?

[@drexlermendoza5466]

What kind of papers can I use as alternative for the second version tube?

[@YeanyScience]

heavy stock paper, I like to add a very thin film of glue and then sprinkle sand on it. I would suggest doing the same thing with the board that you tumble them down.

[@drexlermendoza5466]

Thanks for the reply Mr. Bruce! Thank you very much! since i first saw your channel ...i thought that you tutorials can be a great help for me since in our school we were told to find and make a physics toy that is why im so thankful for your projects and etc.! Keep up the good work sir!

[@skyr8449]

make one using a fluid!

[@YeanyScience]

Good idea, I will try

[@skyr8449]

Bruce Yeany thanks for the response! I am curious of if it will work.

[@phaphachboy]

Those are some cool versions of the tumbler toy. I know a version that gets offended if you assume it's gender.

[@christianjones325]

name of song at the beginning?

[@YeanyScience]

it is called acoustic sunrise, one of apple's free music jingles for movie editing

[@sheikhussain7415]

can you please make dc motor in coke can or round bottle or something just like real motor! i searched a lot for that type of home made dc motor!

[@YeanyScience]

sheik hussain Hi, Thank you for the suggestion, I will see if I can find one

[@sheikhussain7415]

thanks for reply and email me when u make it! have a nice day friend :)

[@MyChannel-t5x2r]

Your idea help me to make one kind of tumbling toy :D Can U check it out and tell me what do U think ?

[@YeanyScience]

I think you did a really nice job with it, good instructions on building it

[@palakgulati411]

amazing ..gud ways to learn

[@harshmankodiya9397]

Nice channel

[@eleuteriocastano3890]

What if ... let this go down and up a brachistochrone????

[@utkarshpatil4937]

Amazing

[@sheikhussain7415]

nice videos

[@michaelmayne6097]

They're like mighty beans

[@fcu042ab]

I like that man

[@abdullahmohieddin]

Pretty much mighty beans

[@bluntosophy]

i wish u were my science teacher

[@YeanyScience]

thank you Nick

[@imsohungrysgt9458]

reminds me of those mighty beans

[@Oldie_69]

It is really best toy

[@aztek54208]

+Bruce Yeany - Wow.... with that accent, u must be from the Philadelphia area! Lol. (Or south jersey)

[@YeanyScience]

LOL, AZtek54, this is instantly one of my favorite comments, it's not negative on how I talk.

[@mushuroom7392]

... did this for math and science at school

[@YeanyScience]

awesome

[@tunerkismanlibor8147]

У меня эта игрушка была еще 30 лет назад

[@ahmetizmir1081]

Drug capsules and a small steel ball are enough.

[@AgentOffice]

this one is scary!!

[@deadlynightshade7867]

Science version of art attack

[@annavassilenko9759]

Офигеть крутой чел

[@juanmanuelyounghoyos7350]

i am latinoamerican

[@sandymoonstone855]

🍎 📷 👌 yikes 😱

[@Zak-ob5ze]

All you've done is show, not explain

[@Canzandridas]

I hesitated to subscribing but what the heck!

[@allinone.5624]

Osm

[@samteems280]

its my third virgin

[@allinone.5624]

Osm