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Angular Motion and Torque 

Professor Dave Explains
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More spinning things! Records, and wheels, and doors, and other fun things. The equations that govern this kind of motion are just like the ones we learned in kinematics, except they have different symbols. Lots of funky Greek letters in this one, folks.
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20 мар 2017

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Комментарии : 229   
@ayusharipirala3121
@ayusharipirala3121 6 лет назад
Dave is the guy who looks like he plays guitar in a grunge band until you realize he's the best physics/chemistry teacher online.
@ProfessorDaveExplains
@ProfessorDaveExplains 6 лет назад
but i'm a grunge man at heart!
@alexanderkorol677
@alexanderkorol677 5 лет назад
He always reminded me of Jesus
@overlordprincekhan
@overlordprincekhan 4 года назад
@@ProfessorDaveExplains I hope you will also release some of the grunge or guitar learning tutorials in soon
@evolvinggenius596
@evolvinggenius596 4 года назад
XD
@linnertjacques1263
@linnertjacques1263 4 года назад
@@alexanderkorol677 lol hahahahahaha
@emmanuelnava6582
@emmanuelnava6582 4 года назад
Once my physics course is over, I promise I will donate to your channel. Thank you, Professor.
@billusandda5845
@billusandda5845 2 года назад
Take my money too prof!!
@user-zx2et9lf8y
@user-zx2et9lf8y 2 года назад
👀
@cabbage5114
@cabbage5114 2 года назад
with certainty. just let me start earning. (I'm in 11th grade now🙂🙂)
@BrigetGerman
@BrigetGerman Год назад
🤒
@malaypaul6848
@malaypaul6848 Год назад
​@@cabbage5114 from India?
@ooffoo5130
@ooffoo5130 3 года назад
I like the way that you actually explain what torque is and not just how it is calculated
@noahbarrow7979
@noahbarrow7979 4 года назад
Thank you for another lucid, consumable video. Your work has genuinely gotten me through my semester. Please keep making more content!
@ptkoms
@ptkoms 5 лет назад
Professor Dave- I just really want to say thanks - Your video's are helping me really understand and do well in my Engineering Physics class I love the way you explain Physics - YOU ROCK!!!!!!!!!
@strugglingcollegestudent
@strugglingcollegestudent Год назад
Proffesor Dave, I watched your videos for calc 1 and 2, and gen chem and now, I watch them for physics, ochem, and multivariable calculus. Thank you so much. I couldn't do college without you, organic chemistry tutor, and Pauls online math notes
@kaiser3270
@kaiser3270 Год назад
This is seriously the best learning channel on RU-vid that is in English. Most other channels don’t go in as much depth as this one. 😄
@hikakakaka4
@hikakakaka4 Год назад
i love how he gives us real life examples of usage of torque instead of just telling us that it's a thing that exists that we simply have to accept immediately
@rafaelduarte7137
@rafaelduarte7137 8 месяцев назад
I know right!!! He is so good
@Lucky10279
@Lucky10279 4 года назад
"Clocks are negative" is how my textbook said to remember that clockwise motion is negative and hence counterclockwise is positive.
@uraverageclasher3084
@uraverageclasher3084 6 лет назад
My favourite...i've been sharing it to my friends..keep up the good work sir
@edand69others65
@edand69others65 7 лет назад
great video as always! thanks!
@ashyyybby9926
@ashyyybby9926 Год назад
You are the reason I did so good on my OChem final. Hope it’ll help me pass physics!!
@cotton3349
@cotton3349 3 года назад
Thak you!! Great video!! I was really happy to find info about inbetween perpendicular applied force and parallel applied force for torque
@lumambachoonga7915
@lumambachoonga7915 4 года назад
You are a real professor. Your tutorial help me alot
@CraftyToons
@CraftyToons 2 года назад
Great explanation. Thank you so much!
@opufy
@opufy 2 года назад
I had to skip this lesson to study for a calculus test I had the next day, and this video is extremely valuable to learn the topic, so good that I had to write a comment about it.
@wutong4524
@wutong4524 2 года назад
Guess who has their exam tomorrow?
@chrislafferty1475
@chrislafferty1475 3 года назад
Dope Dave! Thank you!
@kavyahegade6477
@kavyahegade6477 4 года назад
You give the best explanation with nice pronunciation and accent you know🤩🤩
@JoanBaga-be7sj
@JoanBaga-be7sj 2 месяца назад
I like the way you discuss cause you give a background knowledge about the topic for us to easily catch up
@33saiaryanmalladi38
@33saiaryanmalladi38 11 месяцев назад
Thanks for the help I have an exam in a week and this video along with many others helped me to understand the concept.
@kyra5556
@kyra5556 3 года назад
You really explain it well Sir....I was stuck in this concept like forever until I saw your vid thanks for the vid ❤️❤️❤️❤️...
@jazzodarbil7943
@jazzodarbil7943 5 лет назад
Thank u professor Dave, I understand physics easily through your videos, keep it up sire :)
@user-bn4kf3qx1s
@user-bn4kf3qx1s 3 года назад
you are much better than my actual professor lol. I finally started understanding after this video. Thank you so much for sharing your knowledge to people :)
@KiratAlreja
@KiratAlreja 7 лет назад
SWEET AND SIMPLE
@dagreat_495
@dagreat_495 6 лет назад
Why doesn't this video have more views, why do you not have more subscribers, why do you not have thousands of likes?!?!?
@ProfessorDaveExplains
@ProfessorDaveExplains 6 лет назад
i ask myself this every day! please tell your friends!
@jesushernandez-gw2qj
@jesushernandez-gw2qj 5 лет назад
I know right, his videos are awesome. I’m doing well at physics bc of this videos.
@ptkoms
@ptkoms 5 лет назад
@@jesushernandez-gw2qj - me as well he's AWESOME
@Esteb86
@Esteb86 4 года назад
Because most people like watching stupid stuff, unfortunately. It's why we have 10 different housewives shows on tv, and why logan pual can be so famous, while having the brain capacity of a newt. It saddens me
@ConceptualCalculus
@ConceptualCalculus 3 года назад
The pandemic is fixing that. I assign my students to watch a lot of Professor Dave vids, and I am not alone.
@TaniPolansky
@TaniPolansky 6 лет назад
PROFESSOR DAVE!! you are amazing ! these videos have literally changed my semester! spreading the word around class as best i can ! Also- you have to turn the jingle into a ringtone - the fam and i run around singing the song all day just for laughs
@user-wu2rm3bh4y
@user-wu2rm3bh4y 5 месяцев назад
Many people wonder why radians do not appear when we have radians * meters. Here is an attempt at an explanation: Let s denote the length of an arc of a circle whose radius measures r. If the arc subtends an angle measuring β = n°, we can pose a rule of three: 360° _______ 2 • 𝜋 • r n° _______ s Then s = (n° / 360°) • 2 • 𝜋 • r If β = 180° (which means that n = 180), then s = (180° / 360°) • 2 • 𝜋 • r The units "degrees" cancel out and the result is s = (1 / 2) • 2 • 𝜋 • r that is, half of the circumference 2 • 𝜋 • r s = 𝜋 • r If the arc subtends an angle measuring β = θ rad, we can pose a rule of three: 2 • 𝜋 rad _______ 2 • 𝜋 • r θ rad _______ s Then s = (θ rad / 2 • 𝜋 rad) • 2 • 𝜋 • r If β = 𝜋 rad (which means that θ = 𝜋), then s = (𝜋 rad / 2 • 𝜋 rad) • 2 • 𝜋 • r The units "radians" cancel out and the result is s = (1 / 2) • 2 • 𝜋 • r that is, half of the circumference 2 • 𝜋 • r s = 𝜋 • r If we take the formula with the angles measured in radians, we can simplify s = (θ rad / 2 • 𝜋 rad) • 2 • 𝜋 • r s = θ • r where θ denotes the number of radians (it does not have the unit "rad"). θ = β / (1 rad) and θ is a dimensionless variable. However, many consider θ to denote the measure of the angle and for the example believe that θ = 𝜋 rad and radians * meter results in meters. Mathematics and Physics textbooks state that s = θ • r and then θ = s / r It seems that this formula leads to the error of believing that 1 rad = 1 m / m and that the radian is a dimensionless derived unit as it appears in the International System of Units (SI). In the formula s = θ • r the variable θ is a dimensionless variable, it is a number without units, it is the number of radians. When confusing what θ represents in the formula, some mistakes are made in Physics in the units of certain quantities, such as angular speed. My guess is that actually the angular speed ω is not measured in rad / s but in (rad / rad) / s = 1 / s = s^(-1).
@GamingEpochs
@GamingEpochs 7 лет назад
Professor dave saved my life.
@cosmickitty9533
@cosmickitty9533 5 лет назад
Professor Dave is my baby Father
@TheV-Man
@TheV-Man 3 года назад
Same, man. Thank you, prof.!!!
@liampower5602
@liampower5602 3 года назад
facts
@curtpiazza1688
@curtpiazza1688 11 месяцев назад
Thanx Prof. Dave! 🎉
@Jasmita-8
@Jasmita-8 Год назад
his intros is one of the most underated , i can get it outta my head at all ever since i heard it .
@venividivici2135
@venividivici2135 Год назад
I wish I could have teacher like professor Dave in my school. He's really great.
@didfeed
@didfeed 3 года назад
Oh, I loved this!
@ashleemolina343
@ashleemolina343 3 года назад
watching this before my ap physics exam tomorrow. thanks sm for ur help this year.
@Sayandipsen-12ivy
@Sayandipsen-12ivy 10 месяцев назад
The best thing about prof. Dave is he quikly summarizes big stuff 🤯 in smaller chunks 👍🤩
@auderzzz5479
@auderzzz5479 2 года назад
professor dave has single-handedly explained the entire physics syllabus to me ill- let u know if i pass my exams -thanks professor!
@madhushanbog6284
@madhushanbog6284 3 года назад
Very good explanation Sir.., thank you
@imranali-yg3gj
@imranali-yg3gj 7 лет назад
great video
@manivannanc2962
@manivannanc2962 5 лет назад
Sir please also give us some more questions which are in HOTS so that we can know how to apply those concepts ! Thank you sir
@heretocomment2337
@heretocomment2337 Год назад
Hi @ProfessorDaveExplains I have a few questions about torque that I don't know if you already covered in this video, because to be honest, I didn't watch it all, but you are the only one on youtube making videos on this topic that replies. Here are my questions: 1. What absolutely decides whether rotation is clockwise and anti-clockwise? In a 3D spinning item, such as a bicycle wheel or even a ferris wheel like you said, has 2 sides. On one side, no matter how it spins, it will be clockwise, and the same wheel will appear to be anti-clockwise when viewed from the other side. 2. How does torque have a direction in or out of the page? I know the right hand rule RHR, but it doesn't explain anything. Taking the bicycle wheel or the ferris wheel as an example again, think about the axle: when looking at the wheel from the side so all you see is a thin rod, the axle sticks out on both the left and right, but when applying the RHR, and you pick a side, any side, your thumb will invariably end up pointing at either one of the left or the right... it's just a matter of which side you choose. Further, even if the sides don't matter for points 1 and 2 because the mathematical signs will reverse which ultimately end up cancelling, what does it mean when people say torque has a direction in or out of the page? If a spoke in the bicycle rotates as the wheel spins, it spins either clock or anti clockwise depending on how you look at it. The force applied to it is perpendicular to the spoke on the same 2D plane as that of the flat surface of the wheel. However, if you used the right hand rule, your thumb will point in either direction of the axle that sicks out. But that's not where the force is, you are not pushing on the wheel from the side (remember we are looking at the wheel from the side so we only see the thin profile of the wheel tread and no spokes). What is there? How can you say that "torque comes out or into the page/plane" when torque is the force you applied to it (eg to the spoke) to make it turn? Thank you in advance and sorry for the long question.
@Thon.Kuot.inspiration
@Thon.Kuot.inspiration Год назад
Professor Dave is truly a science star.
@esabkhan7901
@esabkhan7901 7 лет назад
amazing video
@niceguy4801
@niceguy4801 3 года назад
Thankyou Sir!
@nastyramaa4326
@nastyramaa4326 3 года назад
I came into the right place, this channel is obviously a lifesaver
@nowaynoway1798
@nowaynoway1798 3 года назад
wow, thanks a lot professor, this saved me a hour
@williamkuri4736
@williamkuri4736 5 лет назад
good explaination
@santhikadimisetty2950
@santhikadimisetty2950 4 года назад
your awesome dave
@boredguy1663
@boredguy1663 3 года назад
Thank you so much
@zeannejoylabadia222
@zeannejoylabadia222 5 лет назад
Thank you sir
@niceguy4801
@niceguy4801 3 года назад
Thankyou sir!
@ximelp7268
@ximelp7268 6 лет назад
Profesor Dave, do you have any videos on rolling without slipping motion?
@anggiarumsari
@anggiarumsari 3 года назад
maasyaalloh, what a helpful tutorial, always love your videos
@cavelinguam6444
@cavelinguam6444 5 лет назад
Nice one
@charityjeffery9511
@charityjeffery9511 9 месяцев назад
Thanks..you Mr❤
@noaycreations7129
@noaycreations7129 4 года назад
watching you from Pakistan Professor your lectures help me a lot keep doing it i appreciate your work
@codespeed116
@codespeed116 2 года назад
I didn't know Dave also teaches physics and chemistry online besides his guitar playing in FooFighter
@kavyahegade6477
@kavyahegade6477 4 года назад
You're so clever and smart🤩
@KalpPatel
@KalpPatel 7 лет назад
Thanks dude, this was great!
@meowsalem
@meowsalem 5 лет назад
when professor dave helps you get a better understanding of physics than your actual physics teacher
@luckybruno5827
@luckybruno5827 4 года назад
You are the best!!!
@gagan1792
@gagan1792 5 лет назад
Thanks a lot you're a savior 👍👍👍👍😁😁
@gracehu3031
@gracehu3031 4 года назад
thank you so much!! : ))
@swattikdas7777
@swattikdas7777 3 года назад
After seeing this video I subscribed 👌👌 explanation
@fortniterpro3397
@fortniterpro3397 4 года назад
Wonderful
@antoni973
@antoni973 5 лет назад
I love your work so much, but if you can extend your videos to go a bit slow while explaining, thanks for your patience
@ProfessorDaveExplains
@ProfessorDaveExplains 5 лет назад
try setting it to 0.75 speed if you need more time
@anhtranxuan1502
@anhtranxuan1502 6 лет назад
thanks
@petermutanhuki6032
@petermutanhuki6032 2 года назад
Dave is my super hero
@allo9228
@allo9228 5 лет назад
That transition at the end tho lol :)
@dimanabdullah8772
@dimanabdullah8772 4 года назад
He is the best.
@skameerubegam8566
@skameerubegam8566 6 лет назад
I really understand u r explanation is well good
@ashleybow192
@ashleybow192 2 года назад
This man is getting me through med school. Thanks bro.
@zalikabi4117
@zalikabi4117 2 месяца назад
hey sis, you graduated yet?
@shikharsingh156
@shikharsingh156 5 лет назад
U are amazing
@suzumii2998
@suzumii2998 11 месяцев назад
sir the unit of torque is NM that is joules. so work, energy and torque are the same quantities?
@heartofblackonyx
@heartofblackonyx 11 месяцев назад
there is a right hand rule for keeping track of positive or negative rotation that is much more robust and systematic than what he describes.
@tlotlisogladwinmore3603
@tlotlisogladwinmore3603 3 года назад
When the video start I was sleepy, but as you arrive at Torque I stood up. KEA LEBOGA.
@shaktivarshasurendran1796
@shaktivarshasurendran1796 6 лет назад
This video is awesome and easy!!
@silvershileka8506
@silvershileka8506 3 года назад
Thank you made me understand this,but sometimes are too fast when explain other topics like momentum
@user-od8vx2ei9g
@user-od8vx2ei9g 2 года назад
👍
@user-qg3ij8ts7e
@user-qg3ij8ts7e 10 месяцев назад
I loooooooooove you man
@IamBaruk
@IamBaruk 4 года назад
Nice Tutorial, please how do I calculate this A circular disc stacked has a total mass 2kg and rotates at the center (bearings). Given that the diameter of the disc is 300mm, what amount of torque is required to make it rotate continuously at 10 revolutions per second.
@carultch
@carultch 2 года назад
Trick question. No torque is necessary to make it rotate continuously at any rate, assuming ideal bearings support it. You need a torque to get it up to speed from rest, but no time interval for the initial acceleration was given.
@farahaslan09090
@farahaslan09090 Год назад
Amaaaaaazing brooo 😍😍😍😍😍😍🤍😍🤍😍🤍😍😍🤍
@babe3736
@babe3736 Год назад
But what did Archimedes say next
@balajimovies5244
@balajimovies5244 Год назад
You are amazing sir lots of love from india 🤞🤞💖
@shaherfurany3926
@shaherfurany3926 6 лет назад
in your example the rod was horizontally placed , what if the rod was vertically placed ? then the force ( torque) will be perpendicular to the rod and consequently sine turns into cosine ??
@anaghaanagri2159
@anaghaanagri2159 5 лет назад
It's always sine theta because theta is the angle between the force (torque) and the plane of rotating object (in other words , the displacement vector )and not the angle between the force with the horizontal. Torque is force times the perpendicular distance between the force and plane of rotating object.
@kishankumar9068
@kishankumar9068 5 лет назад
Sir, please make videos on moment of inertia
@ProfessorDaveExplains
@ProfessorDaveExplains 5 лет назад
check out my tutorial on newton's first law of motion!
@trishabyun3354
@trishabyun3354 5 лет назад
we promote professor dave in our room lmao
@user-wu2rm3bh4y
@user-wu2rm3bh4y 5 месяцев назад
My guess is that actually the angular speed ω is not measured in rad / s but in (rad / rad) / s = 1 / s. If we say that the measure β of the angle is θ radians, we mean β = θ rad, and θ is the number of radians (it does not have the unit "rad"). For emphasis we can say that θ is measured in rad / rad, since θ = β / (1 rad) and θ is a dimensionless variable. When we use mathematical formulas to obtain formulas in Physics, we have to know what the variables represent. What I consider a mistake, is present in the literature, it is not only in this video. Therefore, I will leave another comment with the detailed information to be examined.
@sulalithasannasgala
@sulalithasannasgala Год назад
2rsinc/t is it correct angular displacement c is angel
@sashanovikov69
@sashanovikov69 3 года назад
So professor Dave is a proof of "not all heroes wear capes"
@moontonaccount9489
@moontonaccount9489 9 месяцев назад
Hey, would't the lever that will move the earth be faster than the speed of light since it will transfer force faster than light? So it will mean that something can travel faster than light?
@jasm1ne_ss
@jasm1ne_ss 10 месяцев назад
me and my friend like your introduction song very much
@sushmaallampati2387
@sushmaallampati2387 8 месяцев назад
Even me and my fri -ends 😂
@NatalieNguy
@NatalieNguy 3 года назад
Hi - do I deduce correctly from your introduction (at 0:57) that uniform circular motion is translational motion? I quickly looked it up and one source says uniform circular motion is not translational motion, but rather a special form of rotational motion. I'm a bit confused with the new term "translational motion" in the context of your introduction. Can you please offer some explanation?
@carultch
@carultch 2 года назад
There are principles from both branches of classical mechanics, that apply to uniform circular motion. You can apply both the translational concepts to it, as well as the rotational concepts to it. The term translational motion, just means that it is based on moving the object in its current form from position A to position B, without rotating it, extending it, or flipping it. If an object were in pure translation during uniform circular motion, this would mean that one side of it constantly faces a fixed direction. So imagine painting a ball with half of it red, and the other half blue. Move it in a circular path, while a friend is watching you. Arrange it, so that the blue side always faces your stationary friend. This would be uniform circular motion in pure translation. This usually doesn't happen, because it is a lot easier to create uniform circular motion in a way that it coexists with rotation at the same rate, such that one side of it constantly faces the center. It is a lot easier for you to rotate the ball, so that the blue side constantly faces you, rather than so the blue side constantly faces your stationary friend.
@matthewmcfarlane7612
@matthewmcfarlane7612 3 года назад
Hey why didnt you incorporate the sin of the angle between the weight force and the seesaw in the end example, or is it insignificant
@carultch
@carultch 2 года назад
It's not insignificant. It is equal to 1 when the angle is 90 degrees, the largest value it can possibly equal. Due to this fact, multiplying by it has no impact on the equation.
@fr35hy20
@fr35hy20 2 года назад
For rotational kinematics, can any SUVAT equations be used for questions involving angular velocity, or only the 3 equations listed in the video?
@carultch
@carultch 2 года назад
The SUVAT equations all have counterpart equations in rotational form. They become θωαt equations (pronounced like throw-at, without the r), with the variables we traditionally use. Here's the SUVAT equations for linear motion: v = u + a*t s = 1/2*(u+v)*t s = 1/2*a*t^2 + u*t v^2 = u^2 + 2*a*s And here are their angular counterparts, respectively: ω = ω0 + α*t θ = 1/2*α*t^2 + ω0*t θ = 1/2*(ωf + ω0)*t ω^2 = ω0^2 + 2*α*θ
@sanskrutideshmukh874
@sanskrutideshmukh874 6 лет назад
Good.
@bibilihills5062
@bibilihills5062 Год назад
In the last question why net torque must be zero?
@Roadways50
@Roadways50 5 лет назад
Your videos are very helpful.I am your student from India.keep uploading videos for physics as well as chemistry
@richgolfs
@richgolfs 2 года назад
So if you have a disk of the same mass and you spin them so that they fly through the air, will be spinning disc fly further? Or less?
@carultch
@carultch 2 года назад
If you have two identical disks that you throw with the same linear speed, but give a spin to disk 1, and assume no air drag, they both will travel the same distance from the launch point to the first landing point.
@kavyahegade6477
@kavyahegade6477 4 года назад
I like the "TAU" you pronounce😃🤪
@nickodemuskhaemba8447
@nickodemuskhaemba8447 3 года назад
great
@kostasbaganas3681
@kostasbaganas3681 6 лет назад
FYI: π is not pronounced as 'pie' in Greek, but more like a 'pe' instead. The same holds for the wave function in Quantum mechanics ie. 'pse' instead of 'psie'. Also, torque τ is read as 'taph' (or 'taf'') instead of 'tao' ('taou').
@reaper3.097
@reaper3.097 4 года назад
im not interested in learning pronunciation
@carultch
@carultch 2 года назад
In English, we have to shift the vowel when we say the letter π. Otherwise it would sound identical to the Latin letter p. It is a consequence of the great vowel shift in the history of English. Other languages that use the Latin alphabet, call the letter "pay", instead of "pea", and can retain the original Greek name of π, and still tell them apart.
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