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Gyroscopic Precession



NOTE: This video will appear in a playlist on Smarter Every Day hence the references to Veritasium. Destin does lots of cool science stuff - check out his channel if you haven't already http://www.youtube.com/destinws2

We have been collaborating on rotational motion, which is timely for some of the videos I've been doing lately. In this video I talk about gyroscopic precession - the "wobbling" of a spinning top around its axis.

This is caused by the torque due to the object's weight. The big idea is that the torque vector increases angular momentum in the direction of torque. So if there is no angular momentum initially, it will cause the system to swing in such a direction that it is rotating with new angular momentum in the direction of the torque. However, if there was angular momentum to begin with, the torque will change the direction of that angular momentum by causing precession.


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Автор 4 E ( назад)
does this gyroscopic precession also work on non metallic objects like plastic

Автор Hogan Knott ( назад)
r cross f, not f times r.

Автор PieZello ( назад)
just take AP physics and you'll learn to hate this lol

Автор Anime world ( назад)
can we use gyroscope to create a vertical thrust ?..


by putting a gyroscopic wheel between diamagnetic plates?

Автор AMVaddictionist ( назад)
Thank you for posting this video. Now I understand what my physics book is trying to tell me about precession.

Автор atari7001 ( назад)
Newtonian physics presumes that the momentum of the spinning wheel cannot change no matter what we do to the position or location of the gyro. If we assume this to be true, then what happens to the energy of the system when a torque is applied such that the orientation of the axis is changed and the gyro is forcibly precessed?

Since energy = force x distance, we've spent some energy, but where has it gone? The gyro will naturally resist this influence and come to a stop when the force is removed. Therefore, where has the energy gone? This to me seems even more mysterious than the precession motion itself.

Автор Ron Beric ( назад)
If you go to his website this week, I think it’s the final chance to get a copy of Woody Hyezmar’s woodworking Book, google it.

Автор Jimmy Harry ( назад)
1080p in 2012. I'm impressed

Автор Fk Kwan ( назад)
why does the angular momentum have to be in that specific direction? why not the opposite?

Автор kightremin ( назад)
That hurts...

Автор Joe Deglman ( назад)
So is the torque the same as a motor, I mean a metal object rotating in a magnetic field? What would happen if the entire wheel were plastic?   Is it a static electric force that creates the torque? It does have the right hand rule just like electricity in a wire.

Автор teleturbo ( назад)
This explanation model is probably Walter Lewis work

Автор Shivam Gupta ( назад)
Awesome

Автор Monica Robles ( назад)
Question here!

I want to analyze and explain precession, so I'll do the bike wheel project and all. However, I'm required to measure variants and all. What do I measure and how? The force applied is the controlled variant, and the torque is the dependable, which is the indepentable variant?

Автор Pussystroker ( назад)
OMFG I actually understood something in Physics. OMFG

Автор M F ( назад)
Nonsense. What you see here is how gravity is an electrical force.

Автор BlackFiredDragon ( назад)
it's r x F, not F x r

Автор kartikey nigam ( назад)
hey, its r x F not F x r

Автор Q ( назад)
I was always wondering with gyros if you introduce anti-torque to the suspended wheel ie force it not to spin around will it fall or will it stop rotating?

Автор cafewithcake ( назад)
hmmm please watch vsauce video at this its so different i dont know wich one is right

Автор Arjun Jeewan ( назад)
Jumpscare

Автор caqo2000 ( назад)
(2:34) Could PLEASE anyone explain me why this mentioned torque goes/points that way (to the camera)?

Автор Living the Dream ( назад)
What if 2 or more gyroscope axles were connected at angles? Could the resulting torque be found by vector addition?

Автор Mohammed Rayan ( назад)
warnnig jump scare at 3 42😱😨

Автор Nash H-Aliyyi ( назад)
Sorry man this is not good explanation, whats up with memorizing hand rules,?! Just explain torque momentum and gravity falling effect that constantly battle!, resulting in new vector that moves also constantly side way= rotation.

Автор Dentysta Statysta ( назад)
damned faggot i crapped my pants when the wheel had cut your head.

Автор Nicholas Allan ( назад)
Is it slowing down because of friction, or is it slowing down because the torque cause by gravity is opposing and slowing down the angular momentum? Would it not fall the way it did in a "frictionless" environment?

Автор BOBlibob ( назад)
What does this have to do with precision?

Автор Sheorajek ( назад)
You mispronounced Veritasium.

Автор Juno Chun ( назад)
"I'm gonna bohrow some of their electric equipment," lol. Bohrow.

Автор Frass Saeed ( назад)
Can someone explain to me what torque is? And why does it have the tendency to go out (perpendicular) toward me in the first place? Thanks!

Автор Mash Fournier ( назад)
Tuen this fuclinh wheel ans shut up

Автор Mathoma ( назад)
Although torque is a pseudovector, right?

Автор Blood Rage ( назад)
wow your heart is bad, after spinning the wheel u get breathless.

Автор Chittaranjan Srinivas Swaminathan ( назад)
torque is r x F. and not F x r

Автор Милан Павловић ( назад)
Hm, you are lucky because your camera has low latency, otherwise you will be sacrificed for science :)

Автор Mdw 159 ( назад)
Great vids,, I just understand why it's rotating clockwise.... "The torque and angle of momentum" :D :D :D

Автор BubblesPothowari ( назад)
Torque : Force x Distance. Bicycle pedals. Simple Lever. Larger the distance between point of application and the pivot, larger the Torque.

Precession. When a force, Torque is applied to a Gyroscope, the force effect precesses 90* in the direction of the rotation. Eg. When riding a bicycle, hands free, when I bank left, the the force applied at the top of the rim, pushing it left, precesses forward by 90* in the direction of the rotation of the wheel, and turns the wheel Left. ie The Torque on top of the rim, instead of left tilt, it gives left Yaw. That is precession.

Автор Artemios Nicola ( назад)
I think I'll do a more intuitive video describing the physical meaning of torque. Hold my beer.

Автор Dragon Ball ( назад)
torque should be r×F

Автор Peter Bolwell ( назад)
So applying this to the Earth as a whole, if the planet is rotating on its axis around the equator then ("using the right-hand rule") the torque should make the planet travel upwards in the direction of the north pole out of the plane of the solar system, rather than round the ecliptic (as it does). Why is this?

Автор Osama Anees ( назад)
can someone explain why torque is towards the camera and why not in its opposite direction???

Автор Nuurussubchiy Fikriy ( назад)
So this is how we can easily balancing a bike while moving, right?

Автор UnderMin HH ( назад)
Jajaja The end .. epic

Автор Zeqi Zhang ( назад)
That's extremely clear and logical for me, make perfect sense! Thank you for dedicate yourself to doing all of the awesome stuff in your channel and applying science in to real world! You are my idol seriously!

Автор DarkRayleigh ( назад)
This principe is used to dont let the particles smash against the outer wall in CERN .They are rotating.

Автор Sadism2019 ( назад)
Science lessons from Joker the Alliance Pilot.

Автор Roger Trefren ( назад)
https://youtu.be/-SoWIhuYg6Q

Автор Jayden Stevenson ( назад)
Brilliant demo and explanation. Viewed that way, it's impossible not to understand gyroscopic behavior.

Автор onehit pick ( назад)
The explanation is just rules, and gives no intuitive understanding of precession, leaving it as magic while it is very possible to fathom. We should teach the actual mechanisms why, and not just the rules. To understand why the wheel precesses, you have to follow all the small (incremental) parts of the wheel as they progress, and the forces applied.

Автор Naik Alam ( назад)
great job.

Автор Quan Vo ( назад)
your video sucks, KYS

Автор Wendy Solganik ( назад)
Did his head really get cut of??? Oh, wait, no. He couldn't have posted this video if that happened.

Автор slowpoke96z28 ( назад)
the way I saw it demonstrated in high school was holding the wheel while sitting in a swiveling chair. whichever way you leaned the wheel, the chair would swivel in that direction lol. it was pretty sweet.

Автор geb terrone ( назад)
why am i here watching this

Автор excited inspired ( назад)
torque is not pointing out like that, it is angular velocity & torque is moment which is circular shown by the arrow on the wheel..

Автор Roger Holmes ( назад)
At 2:34, how is the torque toward that direction? and at 2:57, how is the torque perpendicular to the angular momentum? aren't they supposed to be along the same direction?

Автор Myrissa Long ( назад)
this is cool

Автор Johnny Batafljeska ( назад)
Nice video.. but vector product does note commute.. T = r x F

Автор terrysarmy2695 ( назад)
dewwwwwwwwwwdd, I totally get it now!!!

Автор cok Bagus ( назад)
wait, if you have the angular momentum going out. wouldn't that make the wheel spin the other way around?

Автор Alejandro Lemus ( назад)
Damn, you are awesome! Greetings from Guatemala!

Автор Gummy Bugz ( назад)
EXPLANATION FOR ANYONE WHO DOESN'T GET IT:
I spent the last hour reading up on this, confused by wording and concepts, but I think I finally understand, and I want to explain as clearly as I possibly can for everyone else in my position. As well, please tell me if I made any mistakes.
So, gyroscopic precession. First, momentum is the energy stored by a moving object. Angular momentum is stored in a rotating object - since all sides of the wheel rotate, they all have momentum, often called centrifugal force in the case of rotating objects, pulling out from the center of the wheel. normally, when he would let go of the wheel, since it is suspended on the right, it would tilt to the left and fall.
two lines= wheel; one line = suspension point
Wheel: []-
then: \\-
then: |
==

since it has to tilt to the left to fall, that means that the top of the wheel is getting pulled to the left, and the bottom is getting pulled to the right (push the top of a glass to your left, it falls over to the left, same thing here). However, that force takes a small amount of time to act, and by the time it is pulling the top of the wheel left, that part it is pulling is no longer the top, since it is spinning. That part of the wheel is now on the far (back) side relative to the camera. when it gets pulled left, it now moves the back of the wheel to the left, and the front of the wheel to the right. In this way, this makes the whole thing turn instead of fall. Weird.

Автор Shashank Laur ( назад)
Then cars must be able to turn left easily at high speeds rather than right... right? OR is it negligible?

Автор Kai Widman ( назад)
I'm going to be honest, you straight up jump scared me there at the end.

Автор gurunath Reddy ( назад)
i didnt get about spin axis
can u explain that

Автор Too_Funny ( назад)
Did he just quadruple Vsauce at the end there?

Автор Европейский Чудаки ( назад)
Average stereo typical UFO explained.

Автор Taher Zadran ( назад)
Who is watching in 2016

Автор Redwan Ali ( назад)
Love u man

Автор Yingyang ( назад)
you are making it sound as if torque is "acting" on the device. To put it on other words, it feels like from your explanation torque moves the object. But in fact the movement around the cord's axis is based on the conservation of angular momentum of the spinning object.

Автор Zirectioner ( назад)
Who else freaked out at the end

Автор Aiden Ocelot ( назад)
I'm still confused

Автор Shane Ohol ( назад)
So is torque similar to thrust in any relation?

Автор EpicUltraKingSmizzy ( назад)
i thought the vector direction for torques was just a visual thing, something spinning on the ground doesnt actually point upwards...

Автор Felipe Bizarro ( назад)
The best explain that I have already seen! Congratulations for your didactically!

Автор SOLEXTRO ( назад)
cuz wants to twerk duh..

Автор robert brakes ( назад)
Please could someone explain to me how the torque is produced at 90 degrees to the force? My understanding is that when force, being a vector is multiplied by distance, a scalar then the result is just the same vector with a greater magnitude?

Автор Delta on curved Spacetime ( назад)
Veritasium, nice video there. Your explanation was very easy to understand that even a 12year old was able to understand it

Автор Jeremiasz Zielonkiewicz ( назад)
How would that look in space? would that be a means for artificial gravity and additional way to push the space craft?

Автор Robert Erwin ( назад)
I finally get it!

Автор Tai Phan ( назад)
I love you Derek Lol. What a great explaination !

Автор Josh D. ( назад)
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.

Автор Julius Goze ( назад)
I know this from crazyrussianhacker

Автор aman manvar ( назад)
At about 2:56 - 2:57 you say that "torque PUSHES the wheel axle in that way". But torque is not force that it can push or pull!

Автор Sid Kapoor ( назад)
Now I'm not even sure Wat torque is!

Автор Brutal HeadHunter ( назад)
RIP by a bicycle wheel ;[ ha ha

Автор Igor Caike ( назад)
your work is awesome dude!

Автор Saurabh Wanivadekar ( назад)
Your swag said it before you did that it was your alma mater.

Автор Vasin Tantivasinchai ( назад)
Finally, I've got an answer for my question!. Great video!

Автор Nick1p.x ( назад)
twerk?

Автор vivek bajpai ( назад)
good job.

Автор Vamshi Palreddy ( назад)
Nice work on covering up the wrong torque equation with the annotation.

Автор PlushTuber101 PT ( назад)
and twerk Is pushing the tire around

Автор David Jackson ( назад)
My question is

Is the 90deg precession immediate (just varying in force) from a rotation speed just above zero to full speed, or
Is the precession somewhere between 0deg and 90deg from and rises as the rotation speed rises to a max of 90 deg

If you think about it, when the wheel isn't rotating there is no effect and if the wheel is rotating very slowly the is also little or no measurable effect

What I am trying to find out is if the effect is immediate or gradual and how it applies

Автор subil krishnan ( назад)
sir is torque and momentum same?U first mentioned that torque is in direction of camera then in the end of video u r sying dat angular momentum is in camera direction and torque is in forward direction(of rotating wheel).Can u pls clr my doubt.Thankyou

Автор Robin Lowery ( назад)
I didn't understand ANYTHING you said but gotdammit I love it! SCIENCE man! Makes me a lot dumber than I know i am!

Автор Elke Leonhardt ( назад)
looks to me in Min 3:07 that the wheel has been attached to that firm position already before. notice his strange maner to hold it, seems he needs not hold it up looks like heavyless. Hm

Автор Saman Singh ( назад)
The only thing keeping me from admitting how great this video was is that vectorially, torque = r×F & not F×r !!

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