Centripetal swinging tray, improving an old demonstration

The centripetal swinging bucket ad tray demonstrations has been around for centuries and is a classic physics demonstration that can be done at students of all ages. Changing fro using a bucket of water to using a tray with cups of water was a good improvement in the demonstration and in this video I attempt to some additional upgrades to the demonstration to make it a bit more interesting.

this video is a reposting of a previous video that included copyrighted music. It has been removed from this version

[BBG]

Love this teacher, keep up the good work Bruce. Cheers

[EDMPeretti]

Hey Bruce! I'm just starting out my career as a science teacher and finding your channel has made me so happy. I've been watching every video!
Thank you so much!

[TheOMAha]

Bruce, you should really put up a science-themed restaurant, where waiters bring drinks to people like this.

[palarious]

I think you'd love science and futurism with Isaac Arthur. He talks about space based applications of things like this

[MusicByRyder]

Bruce, you are simply one of the best. Thanks for all the knowledge and laughs you've shared over the years.
You are a true hero, good sir🤝

[manouchk]

4:56 the free fall phase is amazing! What I love in free fall, is that raising object are also in free fall...

[Vindictator]

I haven't watched you in a hot minute but you truly do make science fun.

[iHamadQ]

what a wonderful clip, keep going Mr. Bruce. I am from Saudi Arabia and I like to watching your videos.

[Blindsight_Pictures]

Your videos are always very inspiring! Thank you!

[melody]

LOVE the more in depth videos please do more

[Yezpahr]

This was an epic show of skill, you make it look easy.

This is one of those experiments that can mess with people's minds, it can look fake or unreal even when you **know ** this is real.
In fact, if you hadn't shown those two fails I would have been one of the first to jokingly mention "glue is still an option" in one way or another haha.

[KnowArt]

I'd love a good youtuber battle of this

[markschippel]

I love the idea of having the students build their own apparatus to push find limits. I have been using a trick that I learned in junior high. Take a wire coat hanger and stretch it out into a long diamond shape. If necessary bend the hook so it points straight up when the coat hanger is hung from the top of the diamond. Now the fun part. find an older penny with the Lincoln Memorial of the back. Balance the penny on the hook and try to get it spinning around your index finger. Once it is spinning it is quite stable. Then the trick is to stop it without the penny falling. It takes some practice but it is quite impressive once you get the hang of it. Most coins should work (unless they have a hole in the center) as long as they have one face that is pretty flat. Also, some coat hangers have a bevel cut on the end that may have to be filed flat. Once I get the penny stopped I shake the hanger to prove the penny is not glued on.

[FrankLassowski]

Hej Bruce, your students must love you 🙂 I definitely would have back in the days if I had you as my science teacher. But no, there were mostly boring folks… 😞

[crazykittenvideos]

Great video, I am relieved you didn’t fall off the stadium as you were swinging it round! You will need a hammer thrower with higher speed and strength to see what string length can be achieved😁

[bhopro]

When I taught this topic, I also made some circular saw blades out of paper and attached them to hand drills with magnets. They worked brilliantly for cutting pieces of foam. Just keep your finger clear because that would be a nasty paper cut.

[tylerddh]

Crazy you can throw it, I'm gonna try juggling this at some time

[reyb]

It would be good if you could measure the speed of rotation and capture several pictures of the horizontal angle at different speeds of rotation, and then draw conclusions on the horizontal angle of the liquid surface as a function of the speed and the length of string.

[PeetHobby]

This is perhaps the most popular experiment in the world.

[wolf]

It's like a miniature form of artificial gravity.