@@herryjerry5392 Writing on the camera's lens would be absurd, lenses are very expensive and are also very small. Peter would have to write so little to fit all that. They are writing on a lightboard, then the footage is then mirrored.
The rope is not sliding - the friction is static. That means the velocity of the rope = R times dθ/dt of the disk (and therefore energy is conserved, too).
Nice problem 👍very clear explanation 👌
I’ve never seen this problem in such generality
Why haven't we considered the friction between pulley and the rope ? Is that force included when we consider different values of tension ?
This need not be considered as it is an INTERNAL force of the pulley/curved rope system. And it was proven in 31.2 that all internal torques cancel.
the pulley is subjected to T1 and T2 , corresponding to the tensions in the rope, why ? thankyou professor
will the moment of inertia of an object remain the same even after the addition of masses on both sides.???
he is modelling it as 3 separate bodies
Fantastic
why when dealing with pulleys in 2d the accelerations are not different
I cannot understand where are you writing. Are you writing in air?
There is most likely a transparent surface that he is writing on. It has been mirrored so the viewer can see the writing correctly.
I think he is writing on the camera's leense!
@@herryjerry5392 Writing on the camera's lens would be absurd, lenses are very expensive and are also very small. Peter would have to write so little to fit all that. They are writing on a lightboard, then the footage is then mirrored.
@@Marjiance26 No No, I was just jokin, I know he is writing somewhere else, but I fail to understand- where🤔
@@herryjerry5392 on a glass wall
where is the role of friction in all this??
The rope is not sliding - the friction is static. That means the velocity of the rope = R times dθ/dt of the disk (and therefore energy is conserved, too).
The sting experiences friction when moving trough the pulley