Building physics marble tracks-loop de loop track part 2 // Homemade Science with Bruce Yeany

[@MikeLucek]

I had a wacky wonderful physics teacher in high school, must l like Bruce here. My teacher made the mundane fun ! We did lots of wacky physics experiments, including building balsa wood bridges to illustrate the principles of physics and engineer. My teacher was probably the biggest influence to my becoming an engineer !Kudos to teachers like mine and Brue everywhere who can turn the ordinary into a fun learning experience. Thanks Mr Weichern wherever you are for making physics phun.

[@tuskiomisham]

The amount of effort you put into your classroom is huge! I bet the kids love your class.

[@realJman51]

Brice Johnson I would be like "OOOOO I HAVE SCIENCE NEXT HOUR YEAH!!!!!!!!!"

[@nolansprojects2840]

Jman 51 me too! My science teacher sucked... we literally copied the book word for word as “notes” then took a teas on each chapter... but this seems like a lot of fun!!

[@AwesomeMillerChill]

I always enjoyed his class he made learning about physics and science fun, compared to some of the other science teachers

[@cyrillebournival2328]

Thanks for the videos! They are easy to understand because you are having fun showing that to us.

[@d5mute145]

I could watch your videos all day

[@matthewflanagan9097]

I love putting your show on at night and watching it with my daughter, we cast it to the big TV and so you become an actual TV star lol. She loves it she's 10 and thinks you're much cooler than her teachers. We have a bookmark of her favourite experiments of yours that we do at home, you never know she might grow up to become a famous scientist and you'll be the Professor Proton to her Sheldon Cooper.

[@sciencetoymaker]

What a great Newton's Cradle, and easier to build! Thumbs up!

[@brodeur212]

very cool to see you building things !

[@reeganharrison8662]

When u explain this to someone is sound crap but when u watch it its really interesting

[@coolgamworld2810]

I am in 4th grade and I am really getting it and you should make more videos and I like Galileo to do pleas make phyisics videos and I think school is the best

[@YeanyScience]

Hello Nathan, I have several other videos for you to watch plus some more are being made. Thank you for your note

[@ViktoriiaD]

Thanks a lot!!!!:)

[@austinkeyser2445]

I love your videos!!!

[@royemiliani-musicandart1042]

Thanks for the wonderful video.. love it and trying to find the track material you used, which is turning out to be more difficult then i though it would be. Do you know where I can purchase it as Lowes AND Home Depot don't seem to have it.

[@maevemccormick5307]

nice fresnel lenses in the background

[@YeanyScience]

Thanks Max, it works well, we can burn a hole into a soda can in about 10 seconds

[@muskyelondragon]

I expect you may know the answer so I have a question for you. The multiple ball collisions: if the impactor has twice the mass of the other balls does it knock two balls off the other end? Does an impactor of 3 times the mass knock 3 balls off the other side? If one impactor has as much energy as two slower impactors how do the balls on the other side know if it's one ball or two?

[@daneulaz6320]

I just want to play with these marble tracks and join them together

[@aedriancalizo8463]

What are the materials used for making that track?

[@eliot4436]

Just a tip make the loop more tear drop shaped to keep the forces more even though out the loop.

[@Naazon]

EndCubing also a support for the loop stops the sway. A simple A frame over it.

[@thrall9498]

What grade do you teach? I am sure your students love you.

[@YeanyScience]

I teach 8th grade

[@FLyyyT_]

Anyone else think of Jackie Chan Adventures when the intro music played?

[@pawelbjanowski]

Of course this is very helpful - but in Poland I can not find tracks like those. Unfortunately :/ They look so simple to bend. They retain their shape after bending. I am using plastic ones (for hiding electric cables) so I can't bend them so easily and there must be base under whole length of it. Greetings!

[@michaelwinter742]

Paweł Janowski have you tried at furniture stores?

[@pawelbjanowski]

@@michaelwinter742 They are nowhere. Maybe you would be so nice and buy and ship it to Poland? :P

[@حسام777-ت4ظ]

ههه !

[@المهديعليهالسّلام-ب3ي]

il veut creer lame coute que coute

[@Moraren]

Im 24 and would totally go trough school all over again if all the teachers were like you!

[@YeanyScience]

thanks Moraren, I appreciate your comment.

[@griffithd05]

I'm 32 and would be right with you.

[@metalandmayhem0660]

Through**

[@realJman51]

Moraren that would be great

[@lisamcfadden6941]

Moraren ++18552028054

[@jontscott]

Now you are making me curious, in going to have to see if I can work out the math for how high the ball must be to complete the loop. Thank you for the great idea and challenge!

[@carultch]

Given a circular loop of radius R, a particle that slides in pure translation needs to be released a height of 2.5*R above the bottom of the loop. One way to make that work, is to slide an ice cube along this track. Accounting for the fact that the ball rolls, the height needs to be a minimum of R*((5 + X)/2) above the bottom of the loop, where X is the factor in front of m*r^2 in moment of inertia about its center. For a solid uniform sphere, X=2/5, which gives us a minimum height of 2.7*R. This is independent of the mass of the ball, the radius of the ball, and the gravitational field. Actual roller coasters don't use circular loops, because circular loops have the fatal flaw of a 6-g environment at the bottom of the loop, best case scenario. Roller coasters use clothoid loops that are tight at the top, and broad at the bottom, so that the g's are kept within reasonable limits.

[@MelissaAndAlex]

I wish you had been my science teacher!

[@realJman51]

Good job you just got +1 subscriber

[@naveen_kumar_]

+2 now

[@tooot7573]

Make that +3

[@josiahjensen8752]

Ooh make that +4

[@keltonwills8801]

5

[@ashtonmooney7522]

Imagain putting them all together lol

[@boss133749]

Where do you teach that gives you the freedom to do experiments? It's state test this, act scores that, have to raise the performance scores. My son is in 3rd grade and they are already switching their focus to testing. Teaching isn't fun for me in this environment. I like to share knowledge and have fun.... So let me know what country you're in please.

[@realJman51]

Dang building you own marble track then do something sciencey with it then once your done with it you can take it home

[@Angelistiko]

Im a physics teacher and I really admire your work. Like many users have said, I would totally go back to school if my teacher taught me this way, but now I'm on the other side, so it's up to me to make them enjoy physics. Thanks for all your ideas!!!

[@YeanyScience]

glad I could help!

[@MrRkesh]

anyone knows how to calculate the minimum height?

[@omkarchavan5940]

Calculate the centripetal force required in the loop

[@AlexSage]

Very interesting phenomena... I wish my phisics teacher was that interesting...

[@TomHaroldArt]

Thanks so much for creating these videos, Bruce! These are the first I've seen that break down a lot of the basic principles along with very good physical models. There's plenty about this subject that I still don't know all the details about, and I've been building rolling ball sculpture for several years. I always enjoy seeing detailed explanations of the physics at work with the art that I create. Great job!

[@getaclassphys]

So nice collection! You are one of the best physics teachers in the world:))

[@حسام777-ت4ظ]

ههه !

[@michaelszewczuk7173]

Mr.Yeany, I want to go back to school...with you as a physics teacher...rewind to 90's

[@Reempte]

That is why there are up-stop wheels. 6:12

[@jihanashilah6065]

I Wanna Teacher In My School Like you... :) New Suscriber

[@1990Huski]

Where was this teacher when i was in school??

[@JKTCGMV13]

I'm an engineering major in my fourth year of uni and I still enjoy these videos

[@djj]

You make really interesting videos ! I instantly subscribed to your channel :D

[@sherrycambridge1531]

I Remember When We Had Teachers Like This School Was Fun

[@mcesmy]

awesome!!!

[@superand84]

I feel like I have scoured the entire internet for Shelf Bracket tracks like the ones you are using. Could you maybe link to the place where you have bought them? Thanks :)

[@YeanyScience]

Sorry you had problems. Try shelf uprights made by Rubbermaid E5. length 72 inches. Available at Home Depot. cost $2.98 for 6 foot length www.homedepot.com/p/Rubbermaid-E5-72-in-Zinc-Upright-FG4B9200ZINC/100177025

[@superand84]

Thanks a lot :) Let see if they will ship to Denmark. Thx for great content!

[@dakotah2121]

the fact that i smoked weed then watched this has my mind beyond blown XD like how

[@calvinthedestroyer]

Can you try polishing the loop de loop to see if loose of rotational velocity effects the ability of the balls to get through the loop? (you're an awesome teacher)

[@adamrandall3724]

Thanks for the inspiration Bruce. I really appreciate you taking the time to share you ideas. I'm off to the hardware store to buy some shelf bracket tracking.

[@YeanyScience]

good luck with your builds, if you have questions let me know

[@ClubpenguinvsBinweevilsvsHabbo]

I'm in 5th grade and don't understand this but it's still cool.

[@rhallett34]

Surfn's long lost brother inspiration is always the first place to start! And in time you will be able to learn the concepts!

[@Vorpal_Vox]

i have just discovered this channel and I absolutely love it.

[@cjjunior4287]

This is the most satisfying video in YT

[@denisphelipon4695]

If you have not the second ticket where do you stop ?

[@sanne5412]

Thank you for your detailed explanation. We are also building marble tracks, however ours is not working properly, so Im thinking about using tracks now thanks to your video. I live in Europe so Im not sure if the tracks are the same width. What is the width of your tracks? And what size are the balls you are using? I found billiard balls in different sizes online and would like to get the best size for the track. Thanks :)

[@YeanyScience]

our measurements for the ball in this country i probably 1 inch or 2.54 cm, but you can use large balls or smaller, I think 2 cm might work. The tracks are made for book shelves, they are the bracket attached to the wall. Before I found this material, I made. few tracks by carefully cutting PVC plastic pipe in half longways. Cut it on a table saw and then sanded the edges. Worked as long as you did twist the pipe while cutting

[@carlasmith2105]

always interesting. Bet you really have fun with your classes and your children and grandchildren.

[@kavorka8855]

wonderful :D

[@chance1986]

I taught undergraduate physics many years ago. After seeing your videos, I realize I was doing it all wrong.

[@vinodkumar-wm3oq]

Make the loop with the same diameter as the ball!

[@tapashira9251]

Kindly siggest me, which kind of material or the tracks/rack you are using?

[@YeanyScience]

they are metal tracks for shelving available at building supply stores. The tracks attach the wall, tiny clips attach to them and then shelves are added on top

[@TheBurn65]

Thank you so much, I'm building a model of the high low track for my honors physics project and was stumped on what I could use to make the track so that it wouldn't take too much time nor money. This is a life saver.

[@diegomoranorozco8619]

Hi! Great video. I am a student from Mexico, and at this moment i am working on a project about Galileo's Tracks and i've finished of watch this video, but i have a question to get more information to make my project. I hope your answer. What's the theme or purpose of Galileo's Tracks? I mean, the phenomenon watched. I have this question because i don't know exactly what are the antecedents as like Gravity, Movement or something, thank you!

[@wot_noobclown5621]

Totally awesome, dude

[@1eone1o]

Dear Professor Yeany, please recommend me a book with experiments and physics demonstrations for highschool teachers. I'm physics teacher here in Venezuela.

[@muruganandhamem]

I wish to be your student. Well thanks to you and KZbin for sharing these intersting and usefull information to us. Keep doing such experiment and share both the positive and negatives.

[@yassermasood3423]

Thank you sir

[@harishramar]

Hot wheels 🙄

[@bojonow]

How did you draw the curve for the cycloid track?

[@carultch]

Excellent question. Get a disk with the size of the circle that defines the cycloid. Wrap it with a rubber band. Place your pencil in between the rubber band and disk. Sister the flat edge of your board with a piece of dimensional lumber like a 2x4, that sticks out above the surface of your board. Roll the disk along the lumber, while drawing with the pencil at the fixed point on the disk.

[@antonioliu6309]

good video

[@danielklimek7323]

Woah dude

[@elmonni2103]

Damn, why didn't you calculate and show the values.

[@arturschreiber8283]

Weird refugee in championship city circumstance her defense.

[@OneOfDisease]

Excellent video im so glad you showed the loop starting at different points.

[@سلامالكربلائي-ه5ج]

🛠

[@cjcrowley]

Where do you store all of your gizmos?

[@YeanyScience]

I have a large garage and have a section of it with many items on display on shelves, You may see it in some of the videos, in addition, more materials stored in about 75 cardboard boxes sitting there also

[@tylerkrug7719]

Wow! The track made out of glass was really cool! That was a lot of work to make it

[@jarroddowning3718]

4:19 was he drilling in reverse?

[@patco258]

You're videos are great! Thank you for the time teaching us!

[@Wawacj1]

Can someone explain how the loop works ?

[@carultch]

The way it works, is that the ball has to accelerate downward at a rate faster than Earth's gravity, when it is in the upside down portion of the loop. The force of constraint from the track can only push on the ball, and cannot pull on the ball. Therefore, it can only join gravity and cannot counteract it, when the ball is upside down. The forces have to add up to mass*acceleration, which means N+m*g = m*a. Normal force N has to be positive for a push-force of constraint, which means a > g. Since it is following a circular path, the acceleration is centripetal acceleration, due to the changing direction, which is therefore equal to v^2/R, where R is the radius of the path of the center of mass of the ball through the loop. Set N=0 for worst case scenario, and you get a minimum speed of v = sqrt(g*R). Using conservation of energy, we can calculate that this means we need to release it at a position of 1/2*R above the top of the loop, or 2.5*R above the bottom of the loop. If you account for the fact that the ball rolls, treating it as a solid uniform sphere, it actually ends up being 2.7*R, instead of 2.5*R.

[@TheKeyToMusicOfficial]

thanks for all the videos. keep going.

[@mrdr9534]

@Bruce Yeany Thanks for another great video. One suggestion (a humble request), that You allways put a link to what You consider as the "following video"(if there is such a video). Ideally placed at the same place every time, at or close to the top of Your "description". Or in it's own "pinned comment". I suggest this as I often find that You have a logic succession to Your videos, and very often mention it in Your videos. But when I then (naturally) want to go directly to that video, "KZbin fails" to present a link to that video, anywhere on the page. So I'm forced to go back to Your "Channel" and try to find that particular video in Your in the "tab" containing ALL Your videos, something that at times can be a bit cumbersome, as they are not necessarily "posted in direct succession". Just a suggestion. Thanks again for Your fantastic work, both here and as a clearly very inspirational educator. Best regards.

[@YeanyScience]

good advice, I did go back and add tabs that should appear at the ending of some of the videos suggesting related videos but need to do a better job of this

[@Ktulu789]

Hey Bruce! How are your knees recovering? I hope you are fine!

[@YeanyScience]

Hi Lucas, wow, this was a lot harder and more painful than I ever expected. I have made very good progress, worked hard with the physical therapy and am walking around much better than before my operation. I still have a ways go but I am feeling better and look forward to doing some things that I couldn't do before. I look forward to getting back and making some more videos

[@preethalal81]

@@YeanyScience My prayers to u for a speedy recovery

[@dr.riyadhmirzaprof.1380]

I have learned a lot from you , thank you

[@christosvoskresye]

Beautiful. I will totally use these ideas!

[@daryushnadjafi6673]

Cool vids u spark interest

[@stuntman-wy6ul]

I've been trying to look for a material to build tracks for a miniature version of a carnival game called roller bowler this will be perfect, this video has been very helpful and educational, and I thank you for sharing it.

[@YeanyScience]

glad it helped

[@dikshantadhungel886]

You're simply awesome!!

[@jesperaz]

I love this! Thanks

[@riquelsantoso2860]

I love these videos

[@Ozzymandias0]

You are the best!

[@DrNaz]

Where have you been prof?? It's great to see you again! As always i love the effort you put into these!

[@YeanyScience]

Thanks Dr. Naz, it's been a busy start to the school year but I do have several videos planned.

[@1eone1o]

Inspiring! Salutes from Venezuela🇻🇪

[@YeanyScience]

Thank you, nice to hear from someone in Venzuela

[@jarongittinger]

I'd rather watch your videos than Bill Nye's!

[@YeanyScience]

thanks Jaron

[@DragonEYE-kn3mf]

cool

[@christiangeiselmann]

I start wondering where you store all these things...

[@YeanyScience]

It is a problem I ran out of room at our school, I have about 3o boxes against my wall in our garage