Introduction to angular velocity

[SuperTemplar10]

Dear Sir..........your tutorials are invaluable for concept forming and I owe you a debt of gratitude. However, your propensity to waffle is both infuriating and counter-productive. You could perhaps dispense with the ad hoc approach and formulate your tutorials to a greater degree. Don't, however, lose the friendly and encouraging aspect of your posts. Thank you so much for all your input.

[Kricardose]

I am very happy to see the vidoe Angular velocity or how fast something is spinning after you give this

[bebeheuy]

I Love The Video Angular velocity or how fast something is spinning It Can Increase My Knowledge

[Mjhond]

Steady I Really Like This Video Angular velocity or how fast something is spinning.

[ypcommando]

really helpful! thanks alot!



[mufc4everch]

I love KA but there has to be a better tool than MS Paint to use for these videos

[DARKsonofCHAOS]

Those who disliked failed their test.

[minimusmicr0s]

i was trying to figure out linear speed...my book says the variable v is for linear speed and the variable lower case omega is for angular speed so now i'm a little confused over what's what because the formula you used for angular velocity matched up with what my books said was the formula for linear speed... i'm actually kinda really confused now.. (and yes i realize speed is different from velocity but i figured they should have similar explanations.. )

[avpescatore]

Your voice is awesome

[muntaha1231]

the revolution per second is equal to radian per second how?in the linear velocity and angular velocity relation when we multiply the angular velocity equation by r

[rainbowshorizon]

Assalamu alaikom! May peace be with you. ^__^

This video helped me so much so I thank you for that. Teehee.

I hope that this will come in handy for my quiz tomorrow. Huhu. Wish me luck.

More power to you Khan! :)

[a4b3c2d1e0f]

Khan, one tiny incorrect thing that confused me is that you wrote "v = 2pi*r" instead of "v = 2pi*r / T" ! Other than that, great video :) Thanks

[VivaLaMente]

I'm going to say radius's's like that forever now :D

You actually made this seem interesting to me, which is saying something.

yay ^^

[narcomanel]

2 pie radians.

[WhutsWhat]

''radiuseses'' hahhahaha!!

anyway, thanks for your help! you're beyond awesome :)

[cezanerocks]

thank you soooo sooo much, i missed this class in school :)

[FurlowFurlow]

My only problem with this explanation is that you should eventually reefer to revolutions as the frequency. As w = 2*pi*f not just w = 2*pi that makes w appear to be a constant which of course we know is not.

[FurlowFurlow]

@FurlowFurlow Your definition was a proof just for 1Hz or 2pi rad/sec you should do a video on a more general term.

[03kingh]

The definition of the radian proof really sold it for me. Thanks a lot!

[duggle07]

this video would only be like 3min long if you didn't repeat everything you said 2-3times...

[TheKmanOfSmash]

@duggle07

...... It's long because it is based on the basic principle of virtually every video Khan makes. So that we can get a more solid intuition and so he can go at a pace that is comfortable for everyone. I would rather him repeat everything 100 times even if I have a good understanding of the concept than my teacher explain it once and me being too lost to even formulate a question.

[anatube911]

@duggle07

haha well you see duggie the best thing about Khanacademy is that it is made for e v e r y o n e , the super slow like me, the super smart, and the super whatever! So be patient and think of others!



[yo3443]

your videos are awesome i'm thinking of posting specialist maths tutorials soon. I'll teach either how to solve complex numbers first or integral calculas.

[Taconacho0122]

I learn better from you then my math teacher. Thanks :)

[rsabellano]

nice information...

[marvelnoob]

Your power level~ Its over 9000!

[brothadave]

Khan you are awesome, your power is maximum!

[LLiimmzz]

@brothadave loool i haven't hear that since dbz 

[add1c7i0n]

thanks khan...my fuckin book is useless at teaching this

[snuffle1]

@add1c7i0n I'll second that. My book leaves so many things unexplained, who proofs these things? Hate how I have to pay 100+ dollars for a piss poor book I have absolutely no say in.

[tonyinthailand]

not "radiusses"

radii (ˈrādēˌī)

plural form of radius .

[neelo4]

THANKYOU SOOO MUCH. IT HELPED ME SOOO MUCH YOU HAVE NO IDEA...

[girlygirl2192]

nope. still confused

[ahmedbr]

thanks

[8237william]

this is awesome it was frustrating for going to slow in some of the beggining videos but all the info really explains everything

[JokerVA]

You explain in the first 3 minutes what my AP Physics book couldn't in a chapter haha. Thanks Sal! :D

[FreezingSun14]

you should change the anotation at the begining of the vid

[MC8998]

THANK YOU SOOOO MUCH!!!!!!!!

[cauvongkhuyet7]

how do you know the tangent force (force parallel) if you only know the speed and mass. the object is on a horizontal plane. of course you can't do cos90=Fg/Ft. please get back to me asap.

[thrownover65]

Why can't you teach my classes???!

[waleedgilani]

explain the difference between tangential and angular velocity please?

[joudodo]

thank you

[pjtheman1]

haha sal radiuses- radii man radii -great video though really gave me an understanding of the concepts

[sukhWinn]

Thank you so much! I completely understood the stuff now.

[dillydot]

radii lol awesome post!

[mikeryanmortensen]

THAAAAAAAAAANK YOU!

[sambam22031]

Dude. You are a life saver, thanks.

[nothanks099]

sam keeps on saying "i don know" for every example he tries to give.. hahah

[MUsnaredrummer]

I'm pretty sure his name is Sal....

[nothanks099]

sorry bout that. hahaha. LOL. mah mistake. :p

[rubent100]

hahah funny tute :D but it seems interesting.

[Sriyyer]

NIce post..and neatly covered..It would be nice in case you can try and post a related explanation for a turn and Slip indicator of an airplane with regards to Centripetal and Centrifugal forces balance..Thank you

[Gunneryxc]

hehe i was on a game, and i had to compare a weapon's tracking speed to the enemy spinning speed, because the enemies spinning speed were too fast to handle for my weapon, i just bought a better weapon that had more faster tracking speed and i killed it =)

[Chick6517]

that would be awesome to go for a ride like that...and then park the way they did!!! i suppose it would have been more fun with a car that has more torque than a Z.

but thats ok. its still good fun :)

[jock3006]

I watch you more than i watch my professor! You make learning this stuff so easy

[schoolman72007]

Great explanation, much better than my proff!

[kinghaha1]

thankx

please do make more videos

[semicolonman]

haha radiusises... good stuff anyway

[xkon89]

so basically the velocity you're finding is tangental at any point on the circle, right? - since the direction's changing; we cannot call it velocity of the object, as you yourself said..

v=rw applies to tangental velocity then, isn't it?

[xjocelyn9713]

YOU ARE A GOD.

i understand it now ! ! ! !

ha, I'm a sophomore in highschool taking Advanced Algebra Honors w. Trig and I didn't understand this concept at all.

But . . now I do !

Thank you so much.

[axeman972]

why are you not french ? i would be good for me lol

but all nice videos are in english

[dejawolf]

english is derived from old french normannic dialect actually, mixed in with anglo-saxon.

[axeman972]

the french is a beatiful and an hard language whereas the english is beatiful and easy for me . i like this language i would speak english like an american but can't lool

[HIMkidHIM]

I love your videos, but I think it's Radii. ;)

[crookedtool]

A radius is the length of half of the diameter of a circle (plural: radii).

A radian is a unit of measurement for angles, just like degrees or revolutions.

[HIMkidHIM]

At one point in the video, Sal says the radiuses. :P If I didn't have school soon I'd find it, I'll be happy to find it once I come home though.

[crookedtool]

I thought about that after I posted the comment, actually. I didn't watch the whole video.

[Jays0n54]

Well if English changing so fast these days i can't tell you if you are right

[SirLordPeter]

Great lesson!!

[majimay]

thanks, good lesson

[cammyproductions]

if I could show you my hand going over my head I would

[HotPocketCopyCat]

U no hungry 4 understading the mathematical concepts behind angular velocity, U hungry for HOT POCKETS!!!

[EricRamirezRodriguez]

It's funny, but how does it help me in my daily life?

[Mr2718281828459045]

It's not the particular lesson that helps you in daily life. It's the philosophy and attitude --that of empiricism, of rationality and reason-- that help you in your daily life. Any invention you can think of has come about due to those attitudes.

[happyman]

By daily life, you mean your life as a virus, a sheep if you like, doing your routine consumer duties of feeding on propaganda/advertisement and gratifying yourself with preposterous notions on coolness and true love and family. By daily life, you mean life as a cog in a machinery that is voraciously feeding on the planet resources. I say, your daily life is an illusion, a ripple in the ocean of true existence. To quote Plato: "Knowledge is memory of the eternal." Won't you rather have that?

[mike220889]

Radiussseseseses. LOL

[mara182427]

hmm i do this in maths! physics and maths are pretty similar i'm assuming but i dont know because i dont do physics :S

i think they are, especially mechanics, hmm it would be easy to take physics and maths because they overlap alot?!

[Cruciatum]

Mechanics is basically the maths of physics.

[Krisspychiken]

yup, maths is the language of physics.. if your really good at maths your certainly gonna do good in physics.. but it does get tough for me since im not strong in maths, i look at equations and think "how the fuck did he get that?"

[foxbow15]

is this the physics you get in the US? God! i wanted to live in america, we don't even get these kind of subjects because it is to easy.

[Cruciatum]

It's the physics you get in the UK too, it's great because it gives you a break from the tougher parts of the course.

[koreanchaoz]

lol its radii not radiuses

[Soffex]

this would make an awesome homework helper

[stonedmunkeyz]

yoo this totally makes sense and im baked outta my face i didnt know phsyics is so basic i wish i had you as a teacher some ppl should never be alowed to teach a classroom...i was always bad at math unless someone would explain it to me in english

[RamaAmanda]

cool.

[MidnightRayn]

man i like physics but this is putting me to sleep.. no offense though. I'm just hoping somebody is benifiting from this cause for me it's borderline shit.

[outlaWeasel]

this guy talks about physics like its sexy talk.

[MainOffenderKZ]

interesting!

[prettystepover]

I thought it was good

[Druderven]

Just basic physics, neat.

[ExSoldierSith]

Lost it after 30 sec

[traplif3]

i dont know what this guy is talking about

[primociak]

Right...

[MakexTeaxNotxWar]

That´s just like x2+2-9*1,2/y

[yesgeorge333]

5 6EU6UTY

[XsportsbabeX]

i have no idea what he is talkin about

[chibudgielvr]

Man, I just took my physics exam yesterday!

[glendouglas2]

down to the namo sec 1.66.18

[glendouglas2]

ops forgot the the time

60 sec DV 3.6=1.66 of a sec

[glendouglas2]

C=100+D8

8D into 1-10th=1DV

360 =36

[RogerMattson]

It's all greek.

[C7R1S]

well, if you think that geometry and generally maths developed in ancient Greece (certainly in Athens), it is logical that a lot of the geometry's names are in Greek, as maths

[spider853]

Hi... very good tutorial 5/5 ...

I need a little help.. i'm making a car simulation.. and I have Velocity [x,y] , i have Tire Angle (Alpha) and i have Wheel Base (distance from front wheels to back wheels) Dist

now i cant make this car to turn... i dont know how to apply W (Omega) please help me if you can.. i'm trying it for months.. :(