Q2 | Rotational Motion | IITJEE Questions | JEE Advanced Physics | Mohit Goenka

Previous Years IITJEE Questions with more visual understanding. These are very useful for JEE Main aspirants also. Here we discuss a question on Rotational Motion asked in IITJEE in 2012 and is based on the concept of rolling.

Question:
The figure shows a system consisting of (i) a ring of outer radius 3R rolling clockwise without slipping on a horizontal surface with angular speed ω and (ii) an inner disc of radius 2R rotating anti-clockwise with angular speed ω/2. The ring and disc are separated by frictionless ball bearings. The system is in the x-z plane. The point P on the inner disc is at a distance R from the origin, where OP makes an angle of 30 degree with the horizontal. Then with respect to the horizontal surface, (IIT JEE 2012)

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About Faculty-
Completed Bachelors and Masters from IIT Kharagpur. Having an experience of +4 Years in teaching I reckoned the urge within me to help students appreciate the subject by delivering the toughest concept in simplest manner through practical demonstrations and visual aids.

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[pogi]

4year experience and you are teaching like 20year+ experience.☺💐

[sreenivasarao]

Sir this time automatically my hand hit on like botton before seeing the solution😂 tq it was very useful🙏

[leiyamikhodang]

sir, Animation concept is the best way to understand coz i remember of playing since when i was young with tyre....thank you so much for ur guidance....

[bharatiyainnovator]

Sir your pyq adv series is very helpful

[flop_mathematician]

Sir, how the disc is not pure rolling with respect to ground as bearings between ring and disc are frictionless too?

[yashpandey..]

Sir meri andar wali disc ka ang. Vel 24 _w_ aa rha hai, anticlockwise, 😂
whi dekhne aaye the, lekin aap ne bhi direct likh diya hai🙁

[criclovers]

Yes sir pt o per humne inner ring ka angular velocity ignore kiya & for pt P outer ring ka angular velocity ignore kiya aisa kyu ?

[samyakgupta]

why linear velocity at point o is not effected by ring going in acw direction?

[suniltiwari]

Sir, for linear velocity of O, inner disc ke rotation ki vajah se O ki velocity backward wali subtract nahi karengen kya plz tell.

[sameerkushwaha]

THANK U SIR!!
JEE ADV 2024!!
ONLY 27 DAYS LEFT !!

[aryanrohatgi]

Sir outside ring will not exert any velocity at point p like 3rwo ???

[soundsinteresting]

Sir how you figured that disc is performing pure rolling wrt O and not ground

[pranav_majhe_naav]

Horizontal ke sath 30 degree hai angle so answer d aana chahiye

[hardikjain-brb]

Sir vel of point P mai humne outer ring ki wajah se WR velocity ko kyu ignore kiya usse ans AC aa raha hai

[mohitmahore]

Sir disc ke angular velocity se o ke velocity ko farq kyo nahi pada

[sahilsinghbhandari]

Sir iss question me p point ke liner velocity pe outer ring ka bhi to effect hoga naa

[soundsinteresting]

How inner disc is rotating anticlockwise

[chakradhar]

Sir that finger and ring question please.