Physics Olympiad: Finding the Terminal Velocity of a Pencil | IPhO 1998 pr1 & Morin 8.66
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- Опубліковано 24 гру 2020
- This difficult physics problem is from the international physics olympiad (IPhO) (hardest), though in 1998, and I also modified it for this video. It looks at a pencil, hexagon, rolling down an inclined plane/a hexagon rolling down an inclined plane. It is quite an elegant mechanics problem looking at the terminal velocity of a hexagon rolling down an inclined plane, it is not such a common setup of high school physics. Many physics olympiad problems are tricky and elegant in this matter which makes physics olympiads so fun.
This sort of problem is relevant to JEE, F=ma, USAPhO (USA physics olympiad), IPhO (international physics olympiad), CPhO, NBPhO, and many other physics olympiads. Of course the tid bits of geometry are also relevant to competitions like AMC, AIME, etc. Though this isn't a how to win a gold medal at USAPhO/IPhO/qualify for F=ma, it can give you problem solving strategies that would help you with those.
We use properties of hexagons, conservation of angular momentum, conservation of energy, and an idea about terminal velocity to solve this problem. These yield a much nicer method of approach than using things such as forces.
This video was made with manim from 3Blue1Brown.
Sources:
scholar.harvard.edu/david-mor...
www.ioc.ee/~kree/students/iph...
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Couldn't understand this problem until I watched your video. This was super helpful - thank you so much!
Thanks Isha!
I actually watched this video before meeting you at ipho 2023, without knowing that you created it. Amazing video!
What a phenomenal explanation! So helpful!
Thanks! Glad it helped ;)
I didn't understand life until I saw your video. Thank you so much!
Thanks harish!
Wow, very impressive. An amazing video for an awesome problem - and the animations are truly beautiful! Very good job! One point for improvement: I'd suggest some work on the narration. Maybe do a few takes and cut the best parts together. Also consider cutting out the munch sounds in between words since they can be distracting. Overall I'm very impressed by the video and hope to see more like it - I'll immediately check out some of your other videos:)
Thanks! I really appreciate the feedback, will do more takes for the narration from now on.
My dude is really gonna complain about a munching sound lol
Very cool problem. Love the graphics.
Thanks!
Very helpful thank you so much! I stan!
Hi katherine...
Amazing graphics!!!
3blue1brown will be proud of you if he sees this video
I hope so! Thanks!
Commendable efforts!! Man thats really cool
Thank you!
Anyone who makes videos with 3b1b's library is worth a sub.
Looking forward to more :)
Thanks!
Doing gr8 job... love from India
Thanks!
Thank you very much plz dont stop making these videos i am an ipho aspirant and these questions are very useful
Thanks! I won't :)
Indians are here...soon your channel will be 5k+ in few months..your contents are amazing.
Thank you, I certainly hope so!
Great job. I learned a lot.
Glad to hear it!
Thank God I know something about you, congratulations! I love hearing your voice, I love you very much. I am María Guadalupe Garrido Jaime.
Amazing
good video
next level explanation with animation ...............keep it up dear!
Thank you!
What app do you use to make these animations?
I use the animation library for python by 3blue1brown :).
Witch software you use
I use manim, a python library from 3blue1brown.
Great video! Very informative. As a small suggestion; in my view a slightly clearer pronunciation would make it even better.
Thanks! I'll work on my pronunciation, thank you for the feedback!
Nice
Good video man.
Slow down speaking until you can speak easily. Its good enough content that i will be engaged regardless.
Thanks! I'll definitely work on my narration :)
Would help if Angular momentum calculation is shown
It's shown at 5:37 , I hope this helps! :)
As a pretty novice viewer who views these videos just because they are cool, I suggest you end the video with an example. Like, plugging in the numbers for a real pencil to calculate its terminal velocity, using the formula you came up with. I think that would be a nice ending.
Thanks! Thanks for the suggestion, I was thinking that I should have done that after I published the video as well :)
Good video! I have a couple of criticisms with the presentation of the solution:
1. You did not introduce every variable before you used it in an equation - e.g. you did not define what "r" was in the context of the problem.
2. When you reached your final answer for "v_0," perhaps it would be good to emphasize that v_0 was the steady state velocity that the problem wanted us to find.
3. Be careful as to enunciate clearly - sometimes it felt like you were mumbling some of your words and I had to rewind to understand what you were saying.
Other than that, very clear derivation, enjoyed it thoroughly!
Thanks for the feedback! Oh I defined "r" at the very start of the video, but there was quite a bit of time between then and when I used it, I should have said it again. I'll make sure to take these into account in the future, thank you so much!
@@SlippingHexagons yes of course, please keep up the great content!
Nice video. I am learning to use manimlib. Can you post the source code of this video.
Thanks! My source code is really messy atm, so I probably won't post it right now, sorry :(
Nice veideo , please also do problem 8.74 bouncing between bricks..
Ok, I'll consider it, can't promise it though, sorry.
Great content. Only a little hard to understand for non-native speakers to be honest.
thanks! Yeah, sorry I'll try to speak more clearly from now on.
@@SlippingHexagons cool! Thanks so much! :D
non slipping hexagons
merry christmas
indeed :D. Merry christmas!
i wish i could slurp watermelon as well as you
shlrup shlurp
🍉
your speaking is not clear, but the graphics was good. Keep it up
Thank you, I will!
woah viral video
haha thanks!
hau to be saxi laik u saar
It's katherine now... I've been sent by lora
Why is this lowkey good
Ur... Kinda smart? Idk
Hello. Welcome.
Physics Wallah OP 🔥🔥🔥🔥🔥🔥
kachow
kachew
Mumble mumble mumble
haters gonna hate
Crazy how this dude just uploaded a video solving the same IPhO problem I solved and uploaded to YT also using 3b1b's engine just 2 months prior. IPhO literally has more than 100 problems to choose from...
@@overthinkingdude3462 Hey man, I didn't make this video because of your video. To be honest, I haven't watched your video yet. I'm really sorry if it seemed like I copied you. I actually named my channel 5 months prior and made my logo 5 months prior based on this problem, and I was slowly working on making this animated video, but I didn't get to finish until now because my high school classes this year are giving me lots of homework and animation takes me more time (my previous videos were mostly handwritten with some animation at the start for reference).
A couple of my friends asked me to finish the video on this recently (they said they couldn't find a video about the problem), so I worked on it a bit more and finally finished it for Christmas. I've also been using the 3b1b animation library since one of the first few videos... I understand that this response probably won't make you any less angry/annoyed, but I never made this with the intention of copying free content from you or anyone else, even if it does seem like that. Funnily enough, in response to your last point, I didn't actually find this through IPhO, I found it in Morin first, and then found it in IPhO and appended it to the title. Anyways, let's try to both move past this, and together curate more content for the great physics olympiad community :) I don't see any reason that we need to compete, we can work together to make olympiad physics more accessible.
@@SlippingHexagons Cool. Then I have no problem with it, man. What a coincidence. Good luck to your channel! UA-cam isn't a zero sum game, maybe our 2 channels will complement each other! Cheers!
@@overthinkingdude3462 Cool! Hope to see you around again, good luck to you too!