RESOLVED-06 !A COMMON MISCONCEPTION ! PSEUDO FORCE IN A ROTATING FRAME PHYSICS CHALLENGE
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- Опубліковано 6 чер 2024
- A MUST WATCH VIDEO ! A COMMON MISCONCEPTION ABOUT PSEUDO FORCE AS SEEN BY A ROTATING FRAME
Q: A particle of mass m is attached to a rod of length ‘L’ and it rotates in a circle with angular velocity . An observer P is rigidly fixed on the rod at a distance L/2 from the centre.
In the reference frame of the observer P
(a) velocity of m is zero
(b) acceleration of m is
(c) pseudo force on m is
(d) Pseudo force on m is
"RESOLVED" series will present videos curated on doubts of brilliant -topper batch students with whom I have been involved with different CHAI-NA Hyderabad campuses from 2012 to present. The association with these students was an enriching experience for me💓. I sincerely hope , it will be same for those (teachers and students alike) who will go through these series of videos .
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Sir can you please provide me the name of the book where this concept of velocity with respect to observer (not point) in roatating frame is discussed so that i can read more ....
I tried to search everywhere but i couldnt find , please sir can you suggest the book
Whenever rotating frames are involved , we consider OBSERVERs and not points. Points are theoretical ,zero dimensional constructs used for explaining our observations when in translating frames. Points are never considered to be rotating in classical mechanics. Eg: CM is a theoretical POINT . When we say , w.r.t. CM we mean only translating frame. If we attach rotating frame also , there is no Fun or value to Concept . All bodies in CM frame would be in standstill, we wouldn't be able to see rotational KE from CM frame... As per your request reference,
1)You may try a concise version of derivation of relative velocity and pseudo forces from OBSERVERs attached to rotating frame from this MIT courseware lecture
ocw.mit.edu/courses/aeronautics-and-astronautics/16-07-dynamics-fall-2009/lecture-notes/MIT16_07F09_Lec08.pdf
2)You may also read from either "meriam kraigge " or kleppner ( I don't exactly recall the book) . The derivation should be in standard classical mechanics books
3) You may alternatively look at the derivation I did of the same (pseudo force components in rotating frame) for easy understanding in my 100th video (please kindly watch first 15 min atleast🙏🙂) here👇
ua-cam.com/video/KF8JLp3yiVE/v-deo.html
@@PHYSICSSIRJEE Sir, is meriam kraige for Olympiad?? Or more higher
But you didn't mention it in olympiad book video
@@grandson_f_phixis9480 you can go for some parts of it , the list I gave can be always replaced with alternatives. It depends on tastes of different students. Too many Books are not recommended due to time constraint for an Indian student
@@PHYSICSSIRJEE Sir do you have arthur beiser solution manual link?? Can you please share it?? If you get time
Sorry sir for troubling you😭😭🥺
I could not find it anywhere
@@grandson_f_phixis9480 I tried finding it , it's not available . Let's if anyone of our friends here can share
Whenever I forget this concept, I come back again and again to refresh. Such an amazing concept explained in a student friendly manner.
Very thankful to u sir.. Feeling confidennt for Concept that learnt by you..
❤️ Keep supporting students 🙂
Was confused about this since long
Very thanks for clarification ☺️
nice concept sirji 💚 thank you:))
Awesome...cleared my doubts..
Awesome explaination sir 💙👏👏
Thank you so much sir.. this cleared my concept...
Nice explanation 👌
Nice explanation sir 👍
It's Perfect sir...........I would like to say thanks to you for this problem
That initial explanation of case 1,2,3 was excellent sir
Thanks sir for explaining 🎉🎉
My concepts strengthening to a great extent. Thank you sir 🙌🙌
14:25.....outstanding explanation...💥
excellent explanation just excellent crystal clear
Thanks Sir , it cleared all my doubts regarding frames , I always used to thought centrifugal force is a pseudo force with respect to any point on the rotating axle , so always had confusion why it doesn't change with the change in position of the point on axle , but now it is cleared :)
This could be also done only by logical arguments and visualization, glad u covered that part too.
Sir ,waiting for video on centrifugal and Coriolis force😊
Enjoyed this problem. I am a slow learner so it took me double the time of the video to slowly understand and feel the things ans note them but yes I understood everything. I am so happy 😄
Very well explained. A suggestion: actually what you have shown here is a frame which is both translating and rotating. This fact could have been added to the video to relate this concept to the one of purely rotating frames (i.e. the case if the observer sits at the centre of the wheel) which is more widely understood.
Thank you sir 😊
Sir, I am in IIT bombay and I was having my physics endsem, I couldn't understand the concept when professor explained but the way you explained in this and that 100th video it was fabulous, and I got the question correct in paper. Thanks for such a nice explanation.
Thank you sirji😊❤
Thanks sir !
i too did mistake in pseudo force, thanks sir
Lovely problem. 👌
Thank you for appreciating my efforts 😀
Thank you sir the concept...I did got wrong at option D as i was having the same misconception...awesome sir!!
Glad I could help , keep watching 😀
Sir
So would the relative velocity of the mass w.r.t to the point in the middle of the rod be Lw/2 ?
#7 For my revision
Awesome prblm sir
Thank you 🙂
thnk u sir
I found my mistake that I take p as point . Thank you sir just subscribed your channel
Respected sir is the 13 example in hc Verma Sir’s book correct if we use the above concepts ( chapter gravitation)
Done #8
April 9
Direct from #100
Sir you are the real hero who works who work 24/7 like soliders all other sirs are cenima heros only dummy no content
sir i understand whatever you said in this video(and generally in other videos as well) but i can not solve it myself initially i am in class 11 sir it is a matter of weakness to concentrate on?
Sir I am greatly thankful to you for making this video ,I never found an answer to this question ,everybody used to say, why To solve it from centre frame if we are able to solve from hinge frame but being a physics lover I was never satisfied .thanku so much sir🙏🙏🙏
I found this video today although this is 10 months old ,very beneficial sir
Keep watching 🙏, you will learn something from every video here🙂 . Touch wood 🤞
6:20 - Sir couldn't believe that U have told this point in this video itself for which u made an excellent video recently! each and every word u say in the videos can be made as conceptual jee options🤣🤩🤩🤩
Every video is made keeping my future videos in mind. Especially resolved series
@@PHYSICSSIRJEE sir jee adv me sirf 2 months hain aur maine itna late apka channel discover kiya 😔
@@kalashtrivedi4327 2 months is enough. Watch 5 to 6 videos from start at 1.25X speed and note down important points
@@PHYSICSSIRJEE yes sir🔥
Awesome /\
👍
Sir is this why my mother used to be stationary on the merry go round
Have you released the next part of the video sir ??..eager
My 100th video was on that , which I uploaded recently . Please check RESOLVED-12 video in RESOLVED series playlist
Hello sir,i would be happy if you can help here,does the angular velocity of particle M equal to that of the observer?,my thinking is that they are not the same because Observer is rotating about its own axis and particle M is on a uniform circular motion about the centre
In this question they are equal because they complete one revolution in equal time
Sir will there be any change in mass of objects in non inertial frames
For example : a bob is hinged on a platform which is now accelerated
?? Plz reply sir
No , in classical mechanics ... Yes in relativistic mechanics ( not in JEE syllabus )
Sir would a small extended length be considered in the case of observer?
No . The observer is considered dimensionless unless mentioned otherwise
Sir 15:29 , In this part, The centripetal acc of observer is also L/2w^2 towards centre naa sir, Then observer must see pseudo force of ml/2 w^2 naa sir
Total pseudo force is in two parts : what you said plus centrifugal force. So total mlw^2 . Watch the Complete resolved series video on pseudo force in resolved series in Playlist section (my 100th video)
ua-cam.com/video/KF8JLp3yiVE/v-deo.html
@@PHYSICSSIRJEE OKAY sir , Thanks a lot for ur response sir
I don't understand why to create such a ruckus for this. It is obvious that in rotation about any fixed point, different points will undergo circular motion in different planes therefore there will be no approach or seperation between them. Vrel=0. It can be directly concluded.
Sir can it be applied to string and mass connected at the end of string?
Timestamp of your doubt please! And please elaborate what can be applied?
Sir one silly doubt 😅 can we say that for the velocity part , the distance between the observer and the mass m is not changing so their relative velocity is zero ..?? Please rply sir ☝️🙏
No , you can't . Eg : a point B moves around in circle about fixed center A . AB is fixed distance but VAB is not zero
@@PHYSICSSIRJEE thanks sir i got it know 😅👍🏻👍🏻
I have a doubt. We are considering angular velocity of the observer but why are we not considering angular velocity of the block?
Block is small in the problem. It's like a point mass being observed
Sir please do make the next part of this video , eagerly waiting !! :)
In Rotational motion i have learnt that for any point (let's say point A) on a rigid body any other point (let's say point B) is seen to be in pure rotation. Is this valid only for a point and not an observer?
Maybe that's why i got the wrong answer while solving this problem
Yes , for point , it’s true
Sir when question say point p on the rod then we must take point to be rotate.
Points don't rotate , OBSERVERs do
Sir,can you keep all these answers if the question is changed to point p,instead of rotating observer?
Answers for point instead of observer: Option A ) Lw/2 , option B) Lw^2/2 , option C) would become correct
Sir how is pseudo force is half of initial value when we assume that p is a point
@@Algoner points don't rotate. So we use normal relative motion (direct substraction) formula
Sir the acceleration vector is perpendicular to velocity vector in anticlock direction right as it is circular motion then centripetal accerleration also acts in the same direction then we get pseudo force as 3/2 *mlw² sir once clarify the Direction of acceleration vector
@@Algoner both accelerations are towards the center . Each point is in circular motion with same center
Sir from a particular point in the same rigid body the other point in the Rogid body will not be in pure rotation??
Point : yes , observer : no
@@PHYSICSSIRJEE sir I meant to say point is fixed and it is observing
@@twistedargument4308 points are different from "observers" as mentioned in the Problem. Points are theoretical ,zero dimensional and non-rotating. Where as a rigidly fixed observer to the rod is a "ROTATING frame"
@@PHYSICSSIRJEE oh thankyou sir for giving some time from your busy schedule to clear my doubt
L E G E N D
Sir aapne 11 months phele Physics with Akash Goyal sir ke channel per isi question pee comment Kiya (nice explain) sir I have a question. Sir mujhe aapke video follow krni h ya unki i am confused
Dono ka 🙂
Hey canvas, Please provide link for Akash goyal Sir, for same question
@@RohitKumar-ku6pd mere pass nhi h Bhai ab. Abhi IIT Madras mein hu
a burning question here kindly sir, does object labelled M also rotate about itself the way the observer does?
Yes , if you want it to
@@PHYSICSSIRJEE could you please kindly detail it sir ,does the same equations holds if the object labelled M rotates about it's own axis or not
@@rjaph842 this problem ignores the size of M
@@PHYSICSSIRJEE thanks sir and thanks for your reliability also
Sir how to identify whether the frame is rotatory?
Imagine you are sitting on it , if your head rotates then it's a rotating frame
@@PHYSICSSIRJEE ohk sir thanks
sir why should the observer there take that centripetal force [he doesnt sees mass m moving in circle ,actually wrt him mass m is at rest ]
Pseudo force is required to balance the "real force" to explain that the mass is at rest w.r.t observer. Please watch my 100 th video on the channel for more detailed explanation
@@PHYSICSSIRJEE sir my question is that the observer at p does not sees the mass m moving in circular motion then why should he apply that real force . We in ground frame are seeing the mass m rotating in circle but the observer doesnt. Will anyone come from the ground frame and tell the observer at p that the mass m is moving in circle apply a centripetal force. Thank you for reply
@@PHYSICSSIRJEE sir iam a 2023 student and my teacher left us some days back from where i was studying .so iam thinking to join a course of yours for 2023 advance practice, should i join or do selfstudy if yes then which one. i have completed syllabus not want theory type lectures
@@VishnuKumar-yr5ky please DM me in my app
@@VishnuKumar-yr5ky in physics "real forces" are observer independent. THEY HAVE TO SEE THEM
sir har jagah ghum lia tha morin mai dekhne ke baad yaha samaj aya abb coriolis padhuga
All the best 🙂👍🏼... Iss channel ka 100th video is on coriolis ... Please watch it ... Search for " physics sir jee 100th video"
Heyyy dude
Nitin Sir discussed this in his lec of inpho circular motion me vaha hi smj liya and ye problem ho gaya 🙏🏻 thanks Janardhan sir and Nitin sir
sir may i know what differentiates the point P from an observor at P i mean what changes would it make in the solution
To put it in simple words : Observers have heads rotating when attached to a rotating frame. Points don't. They are of zero dimensions. Same has been conveyed in the video 🙂
@@PHYSICSSIRJEE ok sir also sir in the expression for relative velocity in rotating frames is the value of omega the angular velocity of the reference frame
@@ponnapu yes
If the observer was not in middle... then also the object will be in rest wrt to P
Yes, anywhere 👍
@@PHYSICSSIRJEE sir then the relative angular velocity with respect to each would be zero? I am confused I encountered a question in which two particles are at diametrical end and we are asked to find the relative angular velocity with respect to each other using this logic the answer comes out to be zero since v perpendicular is zero
@@nasrinbegam6752 particle is different from observer as discussed in the video
Why dont you upload videos in HINDI
Me and many of my friends who follow this channel are more comfortable in HINDI so plzz. Upload videos only in hindi language - you may keep the subtitles in Eng
I will plan, don't worry 🙂👍🏼. Right now , lot of my viewers don't understand Hindi. So I will plan for a separate channel.
@@PHYSICSSIRJEE thanks for admiring sir ❣️
Sorry If i had been rude 🙏
No no , I don't think you were rude. I didn't feel it that way at all. No need to be sorry 🙂. You were just expressing an idea to increase the reach of the channel
@@PHYSICSSIRJEE 👍
Sir i hope you can be eligible for monitisation please do it sir you will get upto 1,64,235.7988 ruppes
Last problem answer :
Centrifugal force : mw²(l/2) along x+
Corilios force : Zero
Bonus answer :
Linear pesudo acceleration: mw²(l/2) along x +
Well done 👍🏼🙂