Dynamics: Lesson 21 - Equations of Motion Cylindrical Coordinates Example

[@b3dubbs72]

I like how you went into witness protection halfway through the vid

[@Samanananananan]

I couldn't focus on the video anymore after seeing this lollll

[@TerrorSab]

Please keep the course going, I have the worst professor of life, and you're the best way to fix that problem! Please save us from bad professors...

[@Peter_1986]

Are you using the book "Engineering Mechanics: Dynamics" by R.C. Hibbeler? That's the book that Jeff Hanson follows in these videos, and it's a really good book actually - it does expect a lot from the reader, but it has a lot of example problems and keeps things quick and concise.

[@TerrorSab]

@@Peter_1986 Yes I am, which is also why I love his videos.

[@Peter_1986]

@@TerrorSab One science KZbin channel that I enjoy a lot is Michel Van Biezen. He has a bunch of videos on various topics, and they are always straight to the point and easy to watch.

[@jeenyus12321]

Dr. Hanson, PLEASE keep the videos coming. You were a Godsend for statics and materials, but we realllllllly need you for dynamics. I know it's peak hunting season, but if you could spare any time, we would be unbelievably grateful. You know when semesters end, and I need you this semester! I can't understand the words coming out of my professors mouth. He's a nice guy, but the accent is beyond strong.

[@kendranneemery4822]

Sir, I had no clue how to start this problem 25 minutes ago. You made it a breeze with simple and efficient explanations. Your videos are truly appreciated and have been recommended to all the engineering students I know taking statics and dynamics. Thank you for your time and effort to help those who are struggling with these concepts. Texas is extremely lucky to have a teacher like you who really cares. Best wishes.

[@tmo7587]

Note: in the last equation of motion with theta, Dr. Hanson simply forgot to include the " + Nsin(30_degrees)" Happens to the best of us from time to time. Great work Dr. Hanson and I'm happy to support your channel and KZbin and on Patreon.

[@dragonsflame2536]

I was so confused why he didn’t add that thanks so much

[@favhwdg]

Had my first dynamics lecture today, you saved me in statics last semester, please do the same for dynamics. Much love from Turkey

[@cbkt35]

Hasiktir hahahaha :D

[@osmansari8088]

burada bile TÜRK daha çok 😂🤣😂🤣

[@shensley011]

NOOOOOOOO COME BACK!!! It's too hard out here without you! Please I beg on my knees, chapter 14 is ROUGH!!!! Please please please please please good sir don't leave us!

[@Rycamcam]

Thanks so much! May the sum of the forces be with you.

[@adrianajimenez182]

Please, continue making more videos for Dynamics. I'm taking Dynamic this semester. Your videos are saving me. Thank you for all the time you spend making these videos. I truly appreciate all the time you spend and the way you teach.

[@WyrmholeWarrior]

You make a hard subject seem easy. I feel like you're more my professor than anyone else because I've been watching your vids for 3 semesters now. I used your vids from Statics, Solids, and now Dynamics. Unfortunately our class is going to pass where you are in this series after our first test. Please keep creating these vids. There's not a lot of solid videos for these difficult courses and you rock it!

[@kerririddle188]

You got me through Statics! Please keep posting videos for Dynamics they are a huge help.

[@finch866]

Just an FYI he left out the normal force from his final equation (acceleration in the theta direction) but his final answer incorporates it and is correct. If he saved your grade like me and many others consider donating to his patreon. Thank you Professor!

[@nichareemnkr9312]

Why N is pointing out from the centre of circle not from the surface of the rod??

[@dremr2038]

@@nichareemnkr9312 did you find out? If you did, please explain

[@muhammadarafa6189]

@@dremr2038 too late for that but for anyone else wondering, the direction of the force doesn't matter, the result after calculating it will be negative. if you're asked how much is that force then leave the negative sign otherwise use the force with the negative sign

[@ibraheemmonks8866]

2:30 "you've got theta double dot, I dont know what that is" idk why but the way you said that has me laughing so hard

[@TeaheanYT]

I'm taking Dynamics starting late January 2020, please keep this going! We love you! I'm finishing up the Statics course right now.

[@Speed001]

20:45 I belive you forgot the radial component of the Normal force. +Nsin(30)

[@utku3463]

Many thanks for the videos Jeff Hanson i watched all your statics series for my summer school and i got B+. Now im ready for the dynamics you teach very well

[@hazsyah9979]

Im taking exam tomorrow, thank you prof jeff for teaching me. How i wish you keep uploading this course

[@kevinbeastly]

please continue with the course please please this course is really helping me pass (just like it did with statics) because i have a professor that is a good guy but does not know how to teach the subject at all pretty please with sugar on top continue this course i have been able to find anything else helpful (and he is so far one of the best professors i have had in my college life so far)

[@jcnotnot8120]

12:47 Dr Hanson, I think your head and that blur box might be polar magnetic opposites XD

[@burakyanic2113]

Sir! You saved all of us in statics course.I belive that your courses of mechanics of materials will save us.Thanks for everything.But we still need your help. PLEASE. Do not break to giving us hand.Please! Keep posting dynamics videos.

[@slikyiky1340]

wow 2019 waited so long for this amazing stuff

[@Crackback2k]

More helpful than the professor I pay to teach me. Much appreciated!

[@georgesadler7830]

DR. Hanson, thank you once again for another fantastic lecture and excellent example on the Equations of Motion in Cylindrical Coordinates. This particular example is very difficult to follow, however, I will review the problem to increase my understanding of the topic.

[@vuqarrzayev9772]

Hi Dr hanson. Thanks to you i was able to get good marks from exam. You have amazing teaching skills. I am sure that many mechanical engineering students also struggling with fluid mechanics course. So it would be great if you make videos about this subject too.

[@10111115]

I do hope you keep the dynamics up, it’s so helpful. I have a first year professor and she is struggling

[@williamhager7543]

please keep this course going it is a lifesaver!

[@mariacorrales6695]

Please continue the course. You help me passed statics with an A and thanks to you I believe to become the best engineer I can possible be. Please PLEASE continue the course.

[@quinnsullivan2605]

Wicked shirt Dr. Hanson!

[@thenatmann1]

Dr. Hanson, please please please finish this course!!! I'm struggling very bad without your help and explanations, I also have one of the worst professors in existence. The whole time during class we are being tested and not taught to. the book is very difficult to follow and not intuitive at all. There are a lot of things that don't have any rhyme or reason. I hope this gets to you as there are no others that know this material on youtube like you..

[@rawanammatoury9808]

jeff hanson ,, the dynamics course with you is such an amayzing thing i understoood every thing

[@mukadder100]

Structural analysis series, please!

[@WyrmholeWarrior]

Please continue this video series! We need you!

[@misterty4258]

How did you get the theta dot squared using the product rule at about 10:15? I dont understand how there becomes two theta dots right there.

[@ConceptualCalculus]

I can't type theta here, so I'm going to use q in place of theta. He's using the product rule to differentiate 0.8 sin(q) * q'. First, differentiate (-0.8 sin(q)) with respect to t. This requires the chain rule. The derivative of sin(q) is cos(q) times dq/dt. --> d/dt(-0.8 sin(q)) = -0.8 cos(q) * q'. That is multiplied by the q' that was already there, so you get -0.8 cos(q)*(q')^2 That's only the first half of the product rule. Next, we need to leave -0.8 sin(q) as it is, and multiply it by the derivative with t of q''. That gives us -0.8 sin(q) * q''. Putting the two parts together, that means the derivative with t of 0.8 sin(q) * q' is -0.8 cos(q)*(q')^2 - 0.8 sin(q) * q'' I hope this was helpful.

[@NickLaoutaris]

you should have over million likes !

[@moq4463]

Hello, we really appreciate your videos, they are great. I really encourage everyone to subscribe to his patreon! How often will dynamics lessons be uploaded? I am currently taking this class and I hope this playlist keeps up with the quick pace of college!

[@mineshvaranbaskerran2097]

You’re one of the best! Please continue this great work.

[@matthewsmith962]

Why was the normal force not included in the sum of the forces in the theta direction?

[@mfisher128]

I am wondering the same thing myself :(

[@KIMIRAIKKONE198N4]

it has a component in the "theta" direction... it should be included...... yes. and the normal force from the bar is perpendicular to the bar axis.....

[@wildmonkiesJR]

This guy is the Chris Hansen of mechanical engineering class! Thanks for the videos!

[@Armandearn]

more video plz ❤️, my midterm exam is in 2 weeks

[@user-ic8pr2tv5v]

Please continue the course please... All of us desperately need your help!!!!

[@edinalibasic142]

Hi professor, thanks for everything and pls keep uploading dynamics series. Appreciate it

[@AB-jj4xn]

learnt more through this video a day before my exam than i did all semester

[@nteyechitonge2522]

When are you starting thermo ?

[@NickLaoutaris]

you are amazing !! Really great Job.

[@Backflipmarine]

Why is youtube blurring your face after 13:20 ?

[@1234jhanson]

Lol, maybe I got super ugly!

[@Backflipmarine]

@@1234jhanson Haha never! prettiest dynamics prof I've seen xD

[@bendavis7001]

@@1234jhanson more like jeff handsome

[@caiatabalipa]

Great explanation!

[@mohammedalnasri6574]

Thank you sir

[@samuelngangamuthiga283]

thanks for your video, how do we derive equations of motion in cylindrical polar coordinates. or material derivatives in r, theta and z directions

[@coltondunham]

20:26 Nsin(30) IS MISSING! Sum of forces in F(theta) directions: FOA+Nsin(30)-0.5cos(30) = (0.5/32.2)(0.426) N = 0.297 from previous step Solve for FOA=0.300#

[@byttlejuice145]

Oga, Sir, Oluwa, i love u plenty ohh. Now I understand well.

[@drizzd1]

everybody in here talking about jeff saving them from bad professors. meanwhile my professor just assigns us jeffs videos to watch

[@alinagonzalez4129]

Why is there no N component in the theta direction?

[@Kuldeep_852]

Thank you professor hanson

[@abduld4282]

Could you please continue posting ?

[@Backflipmarine]

haha you're saying force a lot while wearing the star wars shirt

[@marcbenedict3676]

Does anyone know if he has a video covering polar coordinates using component method? So we don't have to take a bunch of derivatives

[@mohdmuazzirulaqmar8283]

Sir, I have something to ask...Where are teta dot square come from Sir ?...equation at teta double dot( at 10.30 minute)

[@tiaanmare]

how do we know if we must work with rad or degree

[@wisamalkhoory6237]

what is that blurred square, I couldnt see the graph

[@alimeeran6955]

Please keep making more videos

[@skakldsdsadsa8409]

Boss please more dynamıc videos exams are coming much love from turkey:)

[@Aurora-pp3cs]

You forgot to put Nsin30 in the equation which points in the theta direction

[@teamtoken]

OUR LORD AND SAVIOUR HAS RETURNED

[@ronelordona2687]

Why are you leaving us high and dry on Dynamics but posting other videos?

[@cbkt35]

Statics done. Solids done. Now i have dynamics, fella texasian. Help meeee!

[@isaac3055]

I fw the energy

[@thanatsaisaengtham9643]

It would be great if you also teach mechanic of vibration 🥺🥺🥺🥺

[@asyaagtas3481]

Please make machine elements course videos teacher. Pleaseeeee😍😍😍😍😍

[@KIMIRAIKKONE198N4]

you should be able to derive the relation between your "r" of the coordinate AND and circular path the ball is following....otherwise is it easy! r = 2*rc*cos(theta). ie....relation of "r" in terms of "theta" & "rc"

[@eraycakir6550]

I think you forgot the component of the force n in the last part

[@danielal-zahrany6816]

how can another get 30 degree too?. can someone explian?

[@alexanderdeboeck9358]

F0 misses the Fn in the equation, I don't think the end solution is correct.

[@GustavoHernandez-qw9sr]

got final in 4 days. smh that he didnt finish the course

[@muadzazri752]

mine's in 2 and im still in this topic

[@alishad9777]

Love the shirt, though not as much as I like your videos.

[@BankaiMoshidairo]

Guys please what is that . I mean like .16 or .5

[@ghiafawwaz2461]

Can anyone here help me at dynamic final exam ? I need to get high marks to pass this course

[@sabers7916]

I believe that physics and dynamics are proofing that earth is flat

[@sabers7916]

for example, if airplane will fly from north pole to equator , speed of earth at north pole is zero , and speed of earth at equator is 1670 km/hr , if the speed of airplanes usually around 900 km/hr , then it's impossible for any airplane to make this trip , not only from north pole, but also from any country near north pole, like Sweden or Norway , think about it, you will find that my statement is correct.

[@sabers7916]

But on the real world this trip is applicable, why? Because the earth is flat and stationarry , it's not rotating at all.

[@thenatmann1]

@@sabers7916 wtf are you talking about? do me a favor and go to the north and south pole and see for yourself and then let us know what you find..