15. Advance Illustration | Rigid Body Dynamics | Disc attached to a Spring in Motion | Ashish Arora

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[yadavshashankkumar]

so sir, in this type of questions in which small disc or anything like that mentioned do we need to think abt. rotational kinetic energy ??

[ayushprateek]

No... as disc moves further due to velocity, spring gets elongated as due to inertia of the disc it has a tendency to move in a straight line as initially force by spring is zero...

[vaibhavpandey]

Grt, disc purely roll kr rha hota to aur maza aata

[hrs]

Sir why we have not considered the angular momentum of disk due to its rotation it may also roll in table

[rajnisingh]

Sir can we do if net torque is 0 then at maximum elongation ( mv^2/r = kx )

[SumaidSyed]

Why does the spring start elongating initially? I mean there's no velocity component along spring length..so particle can simply execute circular motion!

[kritarthjain]

sir instead can we use kx=mv2/r at the point of maximum elongation

[muskanmattoo]

I HAVE SEEN ALL THE VIDEOS OF RBD
SIR I WANT ASK THAT .ALL THE TYPE OF QUESTION THAT CAN BE ASKED IN JEE ADVANCED ARE TAKEN IN THIS BOOK

[jashb]

Sit why aren't we conserving rotational k.e as when the spring will elongate the w will change and hence the rotational k.e.
I mean (rot ke) + (trans ke) = (rot ke) + (trans ke) + potential E....the rot KE is changes after elongation and hence it does not get cancelled so there should be an additional term in the energy equation

[inderdeepsingh]

sir, after conserving angular momentum, cant we say mv1^2/(lò+x)=kx

[Ravi-jwrf]

Sir why at maxm elongation centrifugal forces not equal to spring force

[parimagnanimoust]

Sir why will the maximum elongation be at the instant when v1 is perpendicular to the spring length ?

[abhishek]

sir what is best source for extensive practice of advanced mechanics problems?

[ritrade]

Sir how can we decide here that angular momentum about O is conserved?
How to know τ external is zero in this case?

[summernights]

Sir does the radius of curvature of motion show SHM?

[aakanksha]

Sir, Can we say that at max elongation, v=0

[oooo]

I am shocked
Why you made your videos private

[anuragporwal]

sir can we do it by using angular momentum conservation and equating (mv1^2)/x+l = kx

[jokerrecon]

Sir in Energy conservation why didn't you take the discs' Rotational Kinetic Energy?

[aSKv]

At the initial stage why it elongates..and who is causing it to elongate..?