Bruce, it is brilliant!!!

How can you make something something so simple be so awesome? Amazing Bruce, as always! Please, don''t stop making such great content!

Fascinating demonstration. Thank you, Bruce 👍👍😊😊

I still do this as a teacher at school! A regular glue stick works wonderfully well! Also as the section that you twist has tiny ridges it makes a high squeal as it spins.

I really liked the way you managed to convey all the ideas and explanations in this video. Other channels rely on fancy CG visualizations, but you managed to get just as good visuals home made contraptions, creativity and some elbow grease. I also really liked the way you approached the explanation. I wasn't sure the mark on the top would trace a (regular) cycloid because unlike the bottom one, is moves with lots of slipping. Yet with a very simple argument you showed that they both must be tracing a cyclioid. I knew before that the reason you see the mark from one side but not the other was that on one side the spinning goes against the moving/lengthwise rotation, but this video elaborates a lot further than that. Really good work.

@TheRadioAteMyTV

6 ай бұрын

Those fancy CG visuals are a lot easier to come by than his very skilled ability to craft stuff. He is a master of creation of cool supplies. That's anything but easy to come by. Yet another reason to hold him in awe.

Interesting extended Euler effect, thank you.

The one shown at 4:52 is my favorite. Very cool demonstration, and so easy to do. I think I will try it out on my kids tomorrow.

Possible explanation for the lack of mark: the video playback speed is not correct (say 30FPS instead of 60FPS) and the mark happen to fall on the drop frames. 2. Monitor refresh rate cause similar issue. Indeed, if playback at 360p instead of 720p60, the text loses half their letters.

@scottk3292

6 ай бұрын

I'll mention the difference between camera sensors here. A ccd camera, which slowly gathers the light between frames, and which produces motion blur, will be better at capturing these quickly-moving marks, but will have motion blur as an artifact. A camera with a CMOS sensor does an almost instantaneous grab of each horizontal line of the image, scanning down the frame. It's called a "rolling shutter" and it has no motion blur, because it's not storing up much of the light between frames. CMOS sensors are known for distorting fast-moving objects, because the top of the frame was grabbed at a different time from when the bottom of the frame was grabbed. A good example of this is when a plane propellor or the blades of a helicopter seem to bend around in funny ways in video. For capturing the spinning tubes, an old CCD sensor probably would work best, whereas a rolling shutter would make a total mess out of those spinning tubes. The motion blur probably helps to make the "visible" details more visible, and the fast-moving "hidden" details better hidden.

I've been watching you for years, and i'm so happy that you just keep on rolling along. This is something we've all done in the past, just pressing a tube under finger, and watching it spin. It's definitely fun, but you've made it pretty mind blowing. Please keep these videos coming out as long as you can!

@TheRadioAteMyTV

6 ай бұрын

I thought by the title it was going to be a re-make of the one where he taped the cup bottoms together and then put string on the center like a yo-yo with fat sides, but nope, it's a brand new awe inspiring video. I have been here since his sub count was in the hundreds and it's be joyous to learn from him and know so many teachers and students were able to use him as the golden resource he is.

Thank you, Bruce! From one science nerd to another, always enjoy your content!

That's so cool. Thanks for having the slomo footage too. That really helps see what's happening.

I liked all the variations you explored. The persistence of vision reminded me of a keychain trinket my sister had. It was a flat heart-shaped piece of metal on an axis with broken lines printed on either side like hieroglyphics. When thunked with a finger causing it to spin, the words I Love You appeared.

Another triumph! Thank you.

Very nice. Thank you.

Super cool! I love all the variations and experimentation.

Wonderful - thanks, Mr Yeany.

Just making a comment before getting to the end to see if I can guess. The end that you push down on will have the whole tube start spinning around it's long axis, and will push the side of the tube you push down on away from your hand, making it simultaneously spin around its short axis. Therefore, the side you push down on will be moving toward you around the long axis, and away from you around the short axis, making the speeds somewhat cancel out so it moves much slower and is much easier for cameras and our eyes to pick up. On the flip side, the side you don't press down on, will be moving towards you both on the long and short axis, making it move much faster than either of the individual axis on their own, making it much harder for cameras or our eyes to pick up. Thus, the side you press on appears to be the only visible side because it moves significantly slower relative to us than the side you don't press on. If this I right, then it's interesting to note that if you did this experiment on a glass table and looked at it from underneath after spinning the tube, the opposite side from what you pressed down on should be the visible one, as the direction of movement for the bottom side of the tube would be opposite to the direction for the top side (on the king axis), so the roles would flip.

Worked great on my desktop PC! Enjoyed as always!

I watched this video twice, and once in slower speed, and I am thoroughly lost by all of it. In all the years I have watched this channel, and I have seen every video posted here, and stolen and taught nearly everything, this is the first time I felt like I did so often in school where everyone was so excited by what's going on and I am just sitting there wondering when I stopped speaking the same language, because I don't get any of it at all. I see spinning tubes and swirling lights and the words are straight out of Charlie Brown's teacher's mouth for me. This would be the moment I hope with all my heart the kid sitting next to me could translate. When that happened, a ray of light would shine down on both of us, otherwise the mysterious dark storm cloud that entered the class room pours on me until the bell frees my feet to run for the door.

@YeanyScience

6 ай бұрын

Sorry that this one did not make sense. In trying to keep my videos from being too long, I guess I rushed too many variations and too much explanation in too short an amount of time.

@TheRadioAteMyTV

6 ай бұрын

@@YeanyScience I doubt that it was your explanation, I spent a lot of time meeting extra with teachers who would allow it to help me catch up. The internet has allowed me to catch up or pass a lot of people because with research so many answers are there, but that doesn't mean stuff can't still come along that makes no sense at all to me without a little extra help. The weird thing I run into now is how many people that are under 30 were just taught pure gibberish, and they believe the most far fetched things because they were taught that. Being slow doesn't have to mean that one doesn't get to the finish line, sometimes like a tortoise versus a hare, but talking to maleducated people is revealing the disaster we brought on ourselves. I can and do catch up, those under 30s don't even know the right direction to go and having "their truth" doesn't bode well for finding the right way.

Regarding your description: it might be because of the refresh rate of their displays.

Thanks Bruce

strip both ends of that pen at 5:20 and lay the empty pen at the (far) edge of a table and press all your fingertips straight down on the pen .. -hard- and roll the pen backwards slightly so it spits out from under your fingertips away from you and the table. the pen will have so much back spin ass it flies away from you that it will fly UP in a long arc before coming back down again. too much pressure on one side or the other will make it wobble a lot.

@007Narsil007

6 ай бұрын

I came here to make the exact same comment. LOL. It's the Bernoulli (or Magnus) Effect.

@DieCastoms

6 ай бұрын

@@007Narsil007 You know what they say about great minds! we have messy desks.

@TheRadioAteMyTV

6 ай бұрын

@@007Narsil007 The Magnus effect is so wild when sports stars use it. When I learned about it, suddenly all those impossible golf shots finally made some sense. It's pretty wacky in soccer too.

Very interesting. I look forward to hearing more someday about why. That into/outro music….so familiar….

Secret messages possibility? 🤔

The reason that some people might not be seeing the right patterns is probably due to frames per second on their machines. Just like you can make a fan or helicopter blade appear to stand still or speed up or reverse with the FPS. In the experiment with the timing light or high powered strobe light where you can accomplish the same thing with anything that is spinning with a pattern on it.

@YeanyScience

6 ай бұрын

I shot a lot of footage at various fps before it even worked on my own computer. Apparently using a Mac with iMovie , the first clip sets the frame rate so videos shot at different speed are adjusted to that rate. Except for the slow motion clips, I had to ensure everything was shot at same rate. Even doing this apparently did not completely fix the problem for posting it.

@TheRadioAteMyTV

6 ай бұрын

@@YeanyScience Remember, people can change the view rate on their machines which will throw it all off.

So, is it gyroscopic forces that keep one end of the spinning tube elevated?

i used to do this with AA batteries as a kid

@dinhtuan752

6 ай бұрын

Same here!

@Elie-J-Saoud

5 ай бұрын

​@@dinhtuan752and still do 😂

@dinhtuan752

5 ай бұрын

np! i have some AA alkalines from my mom

This got me wondering. If we made the diameter and radius not be integer multiples, could we use this to make an animation like a zoetrope? I'll have to try it sometime.

@YeanyScience

6 ай бұрын

interesting idea, large diameter and small figures might work

Nice Uke. What's the homemade science trick with it?

@YeanyScience

6 ай бұрын

I got it to float in a stream of air

I like the tube the spelled out laurel

@TheRadioAteMyTV

6 ай бұрын

Yanni!

you might want to cut down on the highs in your audio, as it sounds piercing (or get a better mic)

@YeanyScience

6 ай бұрын

thanks, sorry for that, I have problems with my hearing so adjusting the sound levels and pitch has been difficult for me.

@mykolask

6 ай бұрын

@@YeanyScience give it to someone else to doubleckeck ;)

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