Fulustreka
225176
655
10
More about it:
https://www.sciencedirect.com/topics/engineering/gyroscopic-effect#:~:text=The%20gyroscopic%20effect%20is%20that,and%20Sustainable%20Energy%20Reviews%2C%202014
Jan 9, 2025 10:47 PM
Fulustreka
225176
655
10
More about it:
https://www.sciencedirect.com/topics/engineering/gyroscopic-effect#:~:text=The%20gyroscopic%20effect%20is%20that,and%20Sustainable%20Energy%20Reviews%2C%202014
J0NKER
aaah yeah. i remember doing that while sitting in a chair at the old Exploratorium in SF... way back in like 2003 or 2004.
FlintNorth44
IllJustShowMyselfOut
Physics classes are a blast until you have to start doing the math
Fulustreka
Why, mafriend?
Everything looks so easy... /s
angrybook
I struggled so much with math. I couldn't take any physics classes or advanced science classes in high school because I couldn't pass the requisite math courses. It was pretty depressing.
NightOwlRally
Every math teacher I ever had, I hated. I always seemed to get the dead-inside, don't care if you're confused, and the "I have tenure so I'm going to treat you like shit just because I can" type teachers.
ongabonga
That smile in awe
AllTheGoodOnesWereGone
Since your body is powered by over 90,000 trillion spinning electric motors, I want to know if you aligned all the ATPsynthase molecules on the vertical axis, and sat in an office chair, would you spin?
Onlyhereforthelaughs
So bizarre.
JackieTreehornProductions
Angular momentum is a helluva thing
aurifex
Wasn't there sound to this?
nasukkin
Even knowing the math behind how this works. gyroscopes sorta feel like magic.
ShimmerinStrider
=D Conservation of angular momentum.
ValhallaPaperBoy
But what is the diminishing return on angular velocity at the target when transferring from the source. I imagine we'd have to calculate gravity and drag.
ShimmerinStrider
https://courses.lumenlearning.com/suny-osuniversityphysics/chapter/11-2-conservation-of-angular-momentum/
ValhallaPaperBoy
Thanks, ✌️
FiftyShadesOfBroccoli
Which is an anagram of uncommon morgue raven of Atlantis.
Nanoxt
=D
initforthespecs
Basic physics is fucking awesome
eddbrowne
Each piece in rotating disc has kinetic energy. Tilting disc tries to force moving parts in new direction; kinetic energy tries to say no.
ArtemisAndApollo
Reminds me of Captain America in Battlebots
NinjaSpork
you can tell this class is the highlight of the teacher's life every year
Ralphatron
he can barely contain himself the second the student starts to move after he has him turn the wheel, I love it
TofuGolem
Confession: as a kid, I saw tops precessing all the time, and I thought it was caused by friction. Felt so dumb after taking physics.
IApologizeInAdvanceImProbablyDrunk
I've always hated this as there's no logical reason it exerts a force in one direction and not the other.
It could just as easily go the other direction, but it doesn't, and as far as i can tell there's no explanation. We just accept this rule as part of the universe.
ErgodicAnomaly
The rule is conservation of angular momentum my dude. You can absolutely predict what will happen if you turn the spinning wheel 90 degrees while sitting in a spinny chair. You can even tell how fast you should be rotating in the chair after turning the wheel, and of course you can predict which direction.
IApologizeInAdvanceImProbablyDrunk
Yeah, I understand it, it just annoys me a bit.
We've observed the force that occurs from the rotation and use it in physics. My point is the force could very easily be a left hand rule, instead of a right hand rule. There's nothing special about the rotation other than that we observe the force. If I say why couldn't angular momentum be in the opposite direction, as far as I know, the answer is, that's just the way it works. (Maybe there is a better answer but it's above my level)
ErgodicAnomaly
I don't think it's above your level if you understand the right hand rule and conservation of angular momentum.
Go through the process using the left hand rule instead of the right hand rule, you'll find it still works and follows observations perfectly.
You just need to be consistent with which handedness you use.
skipweasel
Which is how some satellites are oriented without having to use thrusters/fuel. https://en.wikipedia.org/wiki/Reaction_wheel
ZephyrusAsmodeus
Oh man, that tickles the nerdiest parts is my brain, lol thanks for that
spyderj
Helps/helped to stabilise ocean-going ships too: https://en.wikipedia.org/wiki/Anti-rolling_gyro
theoriginalgiga
Beat me by 13min!
dangerspouse
and sadly, it's part of the reason that Hubble is looking like it's going to go, though it's had a much longer lifespan than originally planned https://science.nasa.gov/mission/hubble/observatory/design/hubble-one-gyro-mode/
stevenstephenstefan
Actually, the first part is more like a similar device, the control moment gyro. Instead of changing the speed of the wheel, it changes the angle of the wheel.
andydicktracymorganfairchild
Having glanced at that and understood nothing, what powers the reaction wheel?
JustForMatureContent
An electric motor drives the reaction wheel. Fuel is still needed for desaturation burns to ‘push’ against and return the wheel to nominal operating speeds. Running out of fuel to desaturate is a pretty common end of life condition for satellites.
plop
Magnetorquers can be used as well.
deaththeunholy
Solar energy, inertia, electric motor, gravity
Snooj
So ... fuel.
deaththeunholy
The main definition of fuel is “material such as coal, gas, or oil that is burned to produce heat or power.”
So… no not “fuel” in the most common sense
ElbowDeepInAPoliceState
No reaction mass is expended, thus no fuel.
Einstein9073
If you use solar energy to spin up a gyroscope which you then use to manipulate the attitude of your ship, you have done so without consuming any reaction mass or other non-replaceable fuel.
Snooj
I'd still consider electricity fuel.
WeTheI
username checks out
ShimmerinStrider
The 6th and 7th word in the link.
andydicktracymorganfairchild
Electric motor. But he said without fuel, so I assumed wikipedia was wrong.
ShimmerinStrider
Thruster/propellant ≠ battery.
skipweasel
Plenty of solar energy in space... it's not a consumable like reaction mass would be so the satellite can carry on maintaining its orientation until something breaks or wears out.
andydicktracymorganfairchild
Well, based on your comment I thought gyroscopes were magic perpetual motion machines and now I feel sad. And I think you should admit that the sun is a consumable to make me feel better.
Smidge204
Electricity isn't considered 'fuel' by most people.
Fulustreka
It's a concept.
skipweasel
Certainly not in this context.