[Youtube Review][Veritasium] Gyroscopic Precession

(Recommended)Popular Videos : [Veritasium] Gyroscopic Precession

 

This time, I will review the popular YouTube videos.

These days, even if it's good to watch on YouTube, sometimes people skip it or don't watch it if it's too long.

When you watch Youtube, do you scroll and read the comments first?

To save your busy time, why don't you check out the fun contents, summary, and empathy comments of popular YouTube videos first and watch YouTube?

(Recommended)Popular Videos : [Veritasium] Gyroscopic Precession

https://www.youtube.com/watch?v=ty9QSiVC2g0

 

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Playtime Comments : [Veritasium] Gyroscopic Precession

fo********:

At 1:21 you say that torque is given by: T=F x r, but isn't it T= r x F?? The order matters when it comes to cross product.

An***********:

3:28 hey vsauce

Da*********:

1:15 isn't torque equal to R×F??

M:

1:55 you gotta be more careful with those 3D arrows, that almost blinded my eye

af*********:

3:44 "OUGH"

Mu****:

3:43 Thank me later.

Ca****:

Sound like he keeps saying Twerk @ 3:20

Do*************:

@Veritasium At 1:15 tau=r X F not the opposite as you wrote!!! vectorial product is not commutative!

Br**********:

@1:26 that formula provides incorrect direction of torque vector if i used right hand rule

oh*****:

The crazy Hogwart's stuff starts @ 2:20 kids ;)

 

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Top Comments : [Veritasium] Gyroscopic Precession

Ma*****:

Although torque is a pseudovector, right?

Ba*******:

I wanted to see that specific helicopter video by Destin by following the link shown on this video. Disappointingly I ended up on his youtube homepage instead. With hundreds of videos to browse through I soon gave up. Hate it when that happens.

ja*******:

No Miley, Torque...

Ro*******:

You blew my sh**t off at the end!!!

DG***:

What would happen if you had two gyros spinning in opposite directions?

Sa********:

It took me about 2 years to actually get this. Vectors can be confusing.

Ra********:

what is this witchcraft?!?!

Ho************:

cool

Aa***********:

I have a question, how would same wheel react in space or zero G?

Tu************:

i'm sorry torqe is r x f not f x r

Ch***********:

The bit at the end made me jump. 

Sp*********:

RIP in kill Derek
36069-420
Got noskopt by a bicycle wheel
His noskopr was not found
Will be missed
Rest in peace my sweet prince
Your heart will go on

Da*************:

The torque vector as described would actually be R cross F, not F cross R. Don't forget this on your exams or you will definitely get the wrong answer!!!

Jg*******:

interesting... the right hand rule for generators is the same as the one for gyroscopic effect...

Am********:

I keep hearing Twerk

pa****:

That last bit is a little unclear.  It seems that an applied torque to a spin, upright wheel generates an angular momentum that continues in the direction of the applied torque.  It is unclear why the wheel spun along the string axis.

as*********:

At 2:59......why does the "torque pushing THAT WAY swing the other Angular Momentum vector THIS WAY"? We can see that happening quite clearly in the video, but please explain WHY that happens?.

What would happen if I spun that wheel in the opposite direction...the wheel would now precess in the opposite direction, correct? So clearly the direction of precession has something to do with the direction of the angular momentum of the spinning wheel.

We can see from your video that the effect of precession is always to try and align the axis of the angular momentum of the wheel with the axis of torque caused by gravity. Since we are balancing the wheel only on one point, as the axis of angular momentum of the spinning wheel starts to align with torque, the wheel turns and as a result the direction of the gravitational torque also rotates about the vertical. This goes on and on and the wheel then turns and keeps turning like the way it does.

But my question is not WHAT happens, but WHY does this happen. thanks.

Ch**********:

That last bump made me jump

To******:

Did he just quadruple Vsauce at the end there?

Ed**:

Living in this day and age, I couldn't help but hear the word twerk throughout this video.

Je*********:

When he explains the rule of the thumb, he says the torque is in the direction of the thumb (along the axis of the wheel). But later on, when he's about to spin the wheel, he now says that the torque is parallel to the wheel. What is now along the axis of the wheel (the former torque) is now angular momentum. I don't get it.

Ep*****:

Does this explain why you are able to balance on a bicycle even though it should fall over since it doesn't have enough wheels to stay up on its own (like a car)?

Ta*********:

Ouch !! Derek.....    :P

Da*************:

The force is an energy field created by all living things. It surrounds us. It penetrates us. It binds the galaxy together.

Ed************:

hahahah nice ending it got me

So*********:

hhhhh oh my god the ending scares me :'(

Vi********************:

Hi there, first Of all contrata on The chanell!!! I love it!!!I'm a Airbus captain and I also fly helicopters and I always had a question about precession that nobody that I know can answer me...What is the speed that a disc must be turning to begin having the gyroscopic precession?!?

St**************:

Thank you for creating this video, it helped my understanding of the forces involved in the precession of spinning objects. I found your video while looking for a video of someone who has connected two bicycle wheels on one axis, spun them in opposite directions to verify that the angular momentum vectors of each wheel cancel with one another resulting in the absence of the gyroscopic motion. If you are so inclined, I would like to see you do the experiment or link me to a video where the experiment has already been done.

Jo***:

From my standpoint as a physics student, this explanation is not accurate :/

The right-hand rule for vectors associated with rotation is simply a convention. The convention could just as easily have been a "left hand rule", and with the logic presented in this video, the explanation is no longer consistent (with the logic presented in this video, a left-hand rule would have resulted in the bicycle wheel precessing in the other direction).
From my understanding, angular momenta are conceptual one-directional axes that exist in three dimensional space. They do not originate from points in space and go outward from those points; they are axes. With this understanding, the explanation present in this video is incorrect.

I appreciate the correction made at 1:11. Angular momentum is a "cross product", and the order of the "multiplication" does indeed matter.

Ch*******:

Okay but why does the torque move that certain way? That first equation didn't talk about how much force is also being applied upward since it's a wheel. It is then defying gravity, right? The downward spin pulls toward earth/gravity source but the upward spin pushes towards the sky.

I have a bias against equations because they're not language-friendly, but I think there's some mistake or something missing from this explanation. I get that the spin creates a rotation, but I still feel as if there's no proper understanding as to why it's not bouncing around everywhere. Does the downward and upward pull just... cancel each other out?

 

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[Veritasium] We gathered comments about popular videos and looked at them in summary, including play time, and order of popularity.

It's a good video or channel, but if you're sad because it's too long, please leave a YouTube channel or video link and I'll post it on this blog.

 

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