Vectors - Sixty Symbols

[@guitarz667]

There are no more videos on KZbin that are absolutely more entertaining and insightful than Brady's. I absolutely love every channel you have created! Thank you sir.

[@Knowyourbody]

it's a pretty stable system. famous last words

[@girv98]

That squeaking pen...

[@volodyanarchist]

It is not a squeaking pen, it's the potential energy stored in glucose being turnt into the kinetic energy of the muscle fibres in the arm and hand, which in turn is transferred into the kinetic energy of the pen. And due to the friction forces some of that kinetic energy gets turnt into kinetic energy of the air molecules. The unfortunate thing for humans is that our ears pick up ear pressure waved at that particular frequency as "squeaking", but actually it's just kinetic energy being propagated through the air. Now all that we need to do is the ability to gather the "squeaking" and turn it into the rotary motion and we can move from powering automobiles by oil to powering them by squeaking. What a wonderful world it will be.

[@Michael-ur4gd]

It's a marker dammit

[@rich1051414]

James Girven I like a squeaking pen. I don't like the rough sound a dried out pen makes. That runs shivers up my spine :P Or the sound of dry chapped hands rubbing together, or the sound of cardboard rubbing against cardboard... *shiver* Guess i'm weird :P

[@iCantMakeMovies]

Her voice is so pleasant to listen to? And she's my favorite too.

[@sixtysymbols]

@fearghuskeeble: My favourite bits! Like to remind the viewers whose side I'm on! :) If you have a look on nottinghamscience that's where I also post a few extra science out-takes etc. The stuff with Pete and his balloon problems is my favourite.

[@tomatoso27]

I'm watching some of these ones again just to re appreciate the art of the enterview and editing. remarcable!

[@prwexler]

FUN! (The CHEM guys were probably upset that no safety goggles were used for this demo -- especially with the plastic ruler.)

[@cristiangamboa2037]

Most pleasant voice ever.

[@lastmanstanding5423]

well balanced with the most horrible squeaky marker ever

[@raykent3211]

Wonderful teaching style, prof! "I guess mathematicians might try to steal vectors from us..." yeah, and the rest of physics if you don't keep an eye on the pesky critters. Paul Dirac RIP, bless.

[@clark_cant]

Beautiful!

[@andorei14]

Pretty stable system.... LOL

[@morgengabe1]

What a brilliant demo

[@BoredErica]

Such science, so wow!

[@jdrew500]

Never understood vectors until now. Thank you.

[@chestercopperbottom]

00:10 That there is a Parker vector.

[@Savalandan]

The lady physicist explains vectors in a pretty interesting manner: Take a hammer, a bendable ruler (or a stiff or rigid ruler), a band and a table, use them to balance the total force (as well as torque, even though she chooses not to explain it here. Torque is also a vector which is associated with rotation and any system of solids in a stable equilibrium requires also sum of all torques about any point to be zero!) Watch it! You will enjoy it! Suits high school as well as freshman students.

[@fastphys]

That is the most beautifully written F=ma I've ever seen.

[@unvergebeneid]

Brady, it would be great if you could make a Numberphile video about vectors to complement this one here. It would be a very interesting example how different disciplines view the same concepts in different ways.

[@diegorodrigues746]

This looks like a glitch at the matrix.

[@IsaacDeanMusic]

Her hand writing is amazingly neat

[@ronaldderooij1774]

Difficult to understand as my language (Dutch) does not distinguish between speed and velocity. It is both the same word in Dutch (snelheid). But as I understand velocity is speed with a direction.

[@ronaldderooij1774]

+Shivanshu Siyanwal AARGH!! You are making it more difficult :-)

[@chisanfung9383]

I will try my best to explain it, when an object is moving from a place to another, lets say 5 m backwards in 1 second, we call it velocity because as a vector, the velocity has 'length" or "magnitude" (how fast is the object, in this case 5m per sec) and direction (in this case the object is moving 5m per sec backwards). If we dont consider the direction of the movement or the dispacement, we just call it speed because without direction is just a scalar (just a quantity), so we wouldnt know if the object moved forward or backwards. I hope this helps, because as a non-native english speaker, it is a little bit hard to explain things without a proper knowledge of volabulary and grammar

[@AgglomeratiProduzioni]

+Ronald de Rooij I know that feel. In Italian speed and velocity are both "velocità", so I once believed that they were the germanic rude version and the frenchy classy version of the same concept. Now I have to remember the difference thanks to the "V" of vector in the word velocity.

[@ronaldderooij1774]

+Ruben Exactly!

[@ronaldderooij1774]

+chisan fung Thanks! I wonder how the Dutch survived for so long without knowing the difference between speed and velocity.

[@dlseller]

I'm a mathematician but all my undergraduate sciences were physics. I heard all the Physicist vs Mathematician remarks while I was at school and always thought they were juvenile. I still do.

[@JamesCarmichael]

I am by no means a physicist or scientist of any kind, but I really, really do find these videos very exciting and interest. Especially the irish and welsh guy. They seem to make the topics they talk about very interesting. What are their names? I think the welsh one is called Lawrance something and I'm not sure who the Irish guys name is. I'd like to see more videos from them you see.

[@BGenerous]

"The handle of the hammer is being pushed up this way, it's bending the ruler, and it's forcing this end of the ruler down to the table." Actually, no. The force down to the table is always the weight of the hammer, string, and ruler, independent of the upward force of the handle on the ruler, which changes depending where the string is tied. It is true though that the forces on the ruler from the table, string, and handle produce moments (vectors!) that sum to zero. :)

[@rogerdotlee]

The Welch guy on Periodic Videos is Dr. Pete License. The Irish gentleman here on Sixty Symbols is Dr. Phil Moriarty, who fortunately uses his scientific know-how to do good (including some seriously cool videos) as opposed to Sherlock Holmes' nemesis.

[@MrLeaff]

All these videos are amazing!!

[@Lastindependentthinker]

hi, thanx for your response. although I understand the concepts. at the time it just threw me a little bit with the explanation of how to calculate the vector. but i've got it now. thanx again.

[@erictaylor5462]

A lot of people are surprised when told that the short wings on the tail of an airplane actually pushes the tail DOWN, it doesn't hold it up. This provides stability to the plane.

[@Tjita1]

There are actually both designs. It's usually the way you describe though, since, as you said, it provides more stability. Sadly, it also provides more drag.

[@erictaylor5462]

Tjita1 It does. Notes I said the short wings on the TAIL. Some planes have the main wing in the back with short wings on the front. In this configuration the short wings hold the nose UP. Note that it was in this sort of plane that John Denver was killed in.

[@Tjita1]

Eric Taylor There are rear stabilizers with positive lift as well. In that configuration the center of pressure of the wing is in front of the center of gravity. Its a more dangerous design in that if the stabilizer stalls the aircraft will pitch up, further worsening the stall. Care must be taken in such a design so that the wing always unconditionally stalls before the stabilizer.

[@Tjita1]

Eric Taylor Also, I'm a trained aircraft technician, although I've changed proffesion a couple of times since then.

[@shamarone]

wahooo, just crossed over to the darkside and just watched my first sixtysymbols video. figured vectors would be a good starter.

[@pyjamas4000000]

acceleration due to gravity is 9.81, only when you designate your coordinate system is the negative or positive applied. If I say positive y is up then an object accelerating downward has a negative sign, and vice versa. To show an object is `decelerating` as you stated depends again on your arbitrarily chosen coordinate system.

[@code-dredd]

"..and it's a pretty stable sys.." priceless

[@UmlautBanana]

The flexible ruler didn't work as well because the hammer, while exerting the same force, had more room to go because it managed to push the ruler out of the way instead of being stopped by it. Being a lever, it also brought both ends of the hammer (and, therefore, the center of mass) closer to the horizontal center, so it had less room to play with when it came to falling off of the table.

[@YThursday]

Velocity is just speed with a direction. Instead of saying you are going 5 m/s, you say you are going 5 m/s to the right. (Further, as physicists we rarely talk about speed, we just use velocity. u is the symbol for initial velocity, and v is the symbol for final velocity. We can use this in various equations such as v = u + at.

[@kalamatej]

I am wondering. doesn't the speed trap actually care? Measuring only part of your speed towards it i.e. the one component of the velocity?

[@harshm2u]

Woops, that's twice! lol! It sure did make me laugh out loud. And... it certainly was an amazing presentation.

[@tapetedepadaria]

"It's a pretty stable syst...." Best gag reel ever!

[@iv54]

man that was cool my university professor went over vectors but it wouldve been soo much better if they did that experiment.

[@lastmiles]

She left out the force exerted by the table upwards on the ruler. If there were no repulsion by the surface of the table on the ruler then it would pass through the table. It does not. There must be a force pushing upwards on the ruler in order for the ruler to push down also and the sum of those two vectors is zero. Also, there is a rotational torque at play in there causing the rocking back and forth of the ruler+hammer system.

[@lookattheceiling]

State your direction and describe that direction with a sign (for example left is positive). All things such as velocity and acceleration going to the left will be positive. An acceleration to the right will be shown with a negative sign and if an object is already moving to the left it, will be deceleration. Personally I find it helpful never to use the word deceleration: say acceleration and then state it's direction (after all it is a vector...).

[@AlexNovak]

You have amazing handwriting.

[@karlwashere123]

Cant get enough Sixty Symbols...

[@godofthunder9]

first... i love your videos especially the periodic ones

[@erictaylor5462]

I like scalars better. Because if you have a flight crew composed of Roger, Clarence and Victor thing can just get too confusing.

[@dentalhams]

"Huh?" -Kareem Abdul-Jabbar

[@maxmccormick3376]

THE SQUEAKING PEN

[@cheeseitjn]

you wouldn't know if an object was speeding up or slowing down unless you knew both the acceleration and velocity. If both are in the same direction (i.e. have the same signs), then the object is speeding up. If they are different signs, the object will slow down.

[@aSpyIntheHaus]

Oh that made me laugh heartily.

[@deviluzaairdbz99]

4:07 MASS IS NOT JUST A NUMBER, YOU TAKE THAT BACK! *sob sob :'(

[@DexterGoneWild]

"I can poke it, and it's gonna wobble a bit." Please, tell me more!

[@VKHSD]

the plastic rulers μ on the table must have been pretty low :D

[@MatthiasFasching]

In school I never really got the difference between u (speed) and v (velocity). It's too bad that in German both speed and velocity are translated with the same word (Geschwindigkeit).

[@ledhedded6393]

Nobody ever made a distinction between speed and velocity to me until I took Physics. Velocity was always denoted with the "arrow" superscript, denoting a vector quantity.

[@Legolaaa]

Stable system eh? hahahahaha That was fun. I love working with vectors.

[@Mojosbigstick]

Vectors are what caused me to part company with Physics. I couldn't get my head round them when I was 14, and still can't now.

[@superniall50]

I had a maths exam on Monday with vector questions. I now know I got them wrong :(. If only you'd done this video last week...

[@headrockbeats]

I've been looking for a good nickname for her for a while now. After this video I can proclaim: I shall henceforth refer to her as Dr. Hammerfoot.

[@spyroninja]

squeak squeak squeak

[@Desmaad]

Meghan is my favorite instructor, not only because she is very pretty, but more importantly, because, well, umm

[@stevenvh17]

Depends on the convention you use. I would describe the direction of the force of gravity as positive, so that the falling apple's acceleration and velocity are positive. IMO it looks weird when you say that the apple's velocity after 1 second is -9.81 m/s. Though I can understand that when you're working on rockets you would define up as positive, and the earth's gravitational force decelerates the rocket. But not falling objects.

[@Bradley_UA]

Yeah, it's just a convention, but it makes perfect sense that up is positive and down is negative...

[@eatpumkin090]

The sound of that marker on paper was torture.

[@orbsandtea]

It makes me want to get rid of the internet alltogether, until I realise that I need the internet to start such a revolution. Manners, folks ! You don't live in this world alone!

[@SelvesteDovregubben]

Physics relies on mathematics in order to express itself in a satisfactory concise and coherent way. On the other hand, it may well be that mathematics itself would not have gotten as far as it has without physics' inherent demand for it. So I guess I would have to argue that they are, indeed, equal, and that none of them would have advanced as far as they actually have. Besides, what does one get out of quarrelling, put spite and resentment?

[@KevinLi27]

@ThatKidKnows 1 newton force causes a 1 kg mass to accelerate at 1 m/s^2

[@kobil316SH]

Meghan Gray

[@necromanticer621]

Doesn't the example have more to do with the center of mass than vectors?

[@JoelHudson]

What's the vector Victor?

[@MarkArandjus]

I love sixty symbols, but if I never have to do another math problem with vectors again it'll be too soon!

[@PICLex]

Roger roger, what's our vector victor?

[@luisdanielmesa]

Dry marker is too dry :(

[@SSROucherfi]

Gah ... marker sound stabbing my brain.

[@b1aflatoxin]

Love it!

[@Zoidmatrix]

pretty much, yeah

[@G0ldenGoose]

Listen to the woman. She is always right.

[@Lastindependentthinker]

Shame you borrowed his vector in this example as it confused me a little bit. so if you hadn't done it then it should have cancelled each other out and resulted in pushing the book in a straight line? i've watched this about half a dozen times now...

[@NoActuallyGo-KCUF-Yourself]

0:08 And there you see the difference between theoretical physics and experimental physics!

[@gregiep]

"And again, it's a pretty stable sys..." THWACK! LOL ♥

[@DenisKomment]

yeah, me too... what comments?

[@time_371]

Why is time not vector?

[@Kowzorz]

Why can't you mix a hiker and a mosquito? Because you can't cross a scalar with a vector.

[@Stabacs]

Could you explain it to me on german or english?

[@Lord_Raviel]

Reminds me of A-Level Maths and Mechanics problems.

[@StereoSpace]

@SonOfNye Not sad, really. People have a lot of stress in their lives and problems they can't solve. If funny Cats make them laugh, makes them happy for a few minutes, what's wrong with that?

[@davidwilkie9551]

In QM-TIMESPACE, vectors are e-Pi-i resonance imaging of multi-phase superimposed frequency interference, ..relative "chemical" compounding of axial-tangential timing quanta in the context of Eternity-now, ..identities of the Superposition-point seen as 3D Perspective, and perceived in imagination as time-distance vectors, all part of geometrical navigation in the image context here-now. Applying the "One Electron" Theory from the temporal Superposition-point here-now in AM-FM Quantum Information resonance processing projects the general visual cosmology of Timing-spacing interference in purely mathematical terms of ideal gas conglomerations that are the astronomical objects we see, using the same vector coordination techniques recognized as Polar-Cartesian phase-locked dimensional states. Vectors, time duration timing modulation rates of pure relative motion = "just another label" for act-tual existence.

[@turevus]

Some Hermione Granger magic there!

[@jigsawpuppet1000]

Hammer time....

[@redshift1976]

If you hit the speed trap going 30MPH sideways, they might care...and you might be in a Blues Brothers movie...

[@pritemloo]

That made my day

[@Tupster]

Why is robot butt always linked to 60 symbols videos?

[@ArtypNk]

I like her. A lot.

[@wowsa0]

If I remember right there were multiple ones I didn't like... I can't remember exactly what they said now, so I'm sorry about that. The general gist was there were lots of references about her attractiveness, to the point where the vast majority of comments were about that rather than the content of the video. It's a disgrace if that's what a woman has to put up with whenever she talks about science. It gives the impression that they're saying "We don't mind smart women as long as they're hot"

[@heatherhumbird5511]

yes vectors truly have there home in mathematics, but its ok if you use them

[@Russocass]

STOP THAT GREASE PENCIL PLEASE STOP IT!

[@unvergebeneid]

I hope your code doesn't have nearly as many typos as your comment has or it'll never compile ;)

[@Qbabxtra]

Wow, that hammer trick is like finding a glitch in the real life source code! LOOOL. Someone needs to patch that, pls.

[@Cosmalano]

How is that a glitch?

[@MrKnifeFanatic]

electrocat1 un-optimized code, or bad code, can be a clusterfuck of forces that somehow still holds together. :)

[@thefrenchpoet3160]

I heard they were going to in the next edition of reality the new beta 1.2

[@IsaacESFR]

TheGreen Clock The universe is thousands of millions years old we're still in beta? wow

[@jesusthroughmary]

@Desmaad Glad to see sexism is alive and well in the Nerddom.

[@333666666]

Yes, but only in a good sauce.

[@asymptotichigh5]

@Delishful might wanna rephrase tht

[@trexman89]

She has the special relativity book I want!!!

[@madderscientist23]

Phhh. This Lady is gorgeous! She is the exception to the rule that beauty is inversely proportional to intelligence..

[@hatecannon7435]

darn floppy rulers

[@haudace]

i have to try this at home

[@BestShamburger]

3:40 perfect "m"?