Introduction to Tension

[mkhater1]

thank you sooo much

[jddrew03656]

towards the end of the problem, the weight started to look like tevo.

[MrPEDOCTOR]

Im get knowing better.

[charbi88]

soh cah toa.!!!!!!!!!!!!!!!!!!!!!!nice­!!!!!!

[baretings1]

would you call the tension the reaction force of the weight of the block?

or is it a seperate force and will have its own reaction force?

[imonapug]

@kingpit7 just go to his site

[grandprix1110]

no matter how many times i repeat your exact process to find the tension of T1 i keep getting it wrong!! WHY IS PHYSICS SO GODDAMN COMPLICATED!!

[sk8rlt]

@grandprix1110 it's just simple physics bro... You have to get the concept then you will understand everything.

[grandprix1110]

@sk8rlt Thats where the problem is i understand the concept yet i don't know what is going on that im getting wrong. I love math and one of the reasons is that i've realized that in math if i get an answer wrong i can just retrace my steps and find that one small addition error or maybe a negative sign i forgot to place at some point or another, but in physics that's not the case. I can't seem to find any errors in what i'm doing and therers so many steps its just overwhelming.

[grandprix1110]

@grandprix1110 i realized why i was getting the question wrong... the calculator wasn't in degrees, so each time i would use sine and cosine the answer would be wrong because my calculator wasn't on the degrees setting... FML

[griftorifto2]

@Deserfox1972 Because 100 newtons is its weight, this includes gravity. Newtowns/weight = mass x gravity

[crzyaznpistonsfan]

He sounded incredibly ominous in the beginning of the video. "I will now introduce you to the concept of tension...muahahahaha."

[desertfox1792]

At the begging why don't you multiply the mass by (-9.8) since gravity is pulling it down?

[SgxNaaBoy]

@desertfox1792 It has already been multiplied by gravity, thats why its in newtons and not in kg or any other unit of mass.

[cod4lfe]

@desertfox1792 gravity always acts down which is 9.8. if a projectile is going up then G= -9.8.

[PaulK0512]

This guy taught me redox last year! good to see him again :D

[abhishekutkarsh]

you are great !!!!

[casualRunn]

You're fantastic at explaining, Thank you!

[4EverNaturalLover]

GENIUS!!!

[myrandalopezrocks]

can you please make a video about a person pulling a box with a mass on an incline plane and solve for tension on the rope. oh, and there is kinetic friciton.

[iamtheplauge]

It is accelerating! At 0m/s^2! >:(

[ashuchamp9]

tension kaiko lene ka

[muziccmagnet]

it's dat easy? ;) thx man

[martmelee]

i can't believe i love math but i hate physics, is that weird? :(

[Pamplemousse89]

@martmelee

It is EXACTLY THE SAME for me! :(

[BabyyuaDorineaa265]

Hey_I_fÉèl_sø_lônÈlý_tÖÐåy

[horrabletypoe]

When you say "one hundred square roots of three", it syntactically appears to mean sqrt_1(sqrt_2(sqrt3...(sqrt_10­0(3)))), rather than 100*sqrt(3). Had me confused for a moment :P

[fefafe334]

his favorite word is "intuitive" .. lolx!

[megamanxu]

Professor, can you do that WHOLE problem again for me?

Professor: HELLLLLL TO THE NO!

youtube: sure click replay :)

[jj19884]

@megamanxu hell to the no...1 professor disliked

[rattizzle]

I dont know why i have to go to school if i can learn this stuff here which they stupidly teach at school...

[seavech]

thnx a lot!!! now i am ready for the test that i have in an hour!!! THNX A LOT

[frindgedcardigan]

THANK YOU

[frindgedcardigan]

THANK YOU

[xxminaxcoladaxx]

Brilliant....really clear and helpful thank you. I have a forces test on Monday and you've really helped to refresh my memory!

[emmactress1894]

So does T1 include the blue string directly above the object?

[hppaviliona1700la]

Please make a video of this but with an angle in the T2!

Your videos help me a lot, thanks!

[Filastini94]

You're better than my AP physics teacher :)

[cvaldary123]

this really helped me!! thank you!!

[gerrenx7]

Bless you sir

[TheArms50]

the beat might change but the song remains the same

[jfmarque]

Could you please explain an example using an angle as unknown?

[TurtleBboy]

i just wana say thank you..... !!!!!! I finally understand this part of physics :)

[galachoxy]

Ur a great teacher,,,,u make it simple and clear unlike my teacher in physics who just make get a hard time in solving a tension n' frictions,,i like it so much...thanks a lot from timor-lete..

[tantalides]

isn't some of the tension distributed to the bottom string in the second problem?

[ssheku1]

hey do u mean the weight is equal to that of the tension in the string and is it right called it force of gravity, if yes,why

[conve4521]

i think Mr. 30 degrees gained some weight. He use to be smaller...

[pantherfanatic7]

@conve4521 hahahahah:)

[Bisous319]

Thank you so very much. You make Physics fun and graspable!! I appreciate your time! :D

[WentaeDel]

I think that I have just stumble upon the jackpot. I do not know what country you are from but GOD BLESS YOU! You are speaking my language. UNDERSTANDING.

[r0ckin0utIr3land]

that is one fat 30 degrees lol

[bajorox]

first, isn't there any force acting in the x-direction of T1? and second the wire between pink and purple is freely suspended and is not necessarily stationary.. what happens there??

[UberCuba]

that diagram looks pretty off with those angles, lol

[xxsiick]

LOL SohCahToa in blood red!

[Hydrostorm25]

Thanks alot.

You explained this better than my physics

teacher.  Five Stars for sure :)

[bkisme]

You should have used the Pythagorean theorem when finding the T1x tension.

200^2-100^2=T1x^2

30000=T1x^2

173.205081N=T1x

Much easier than using trig functions so long as you have a calculator :)

[karlkarlkarl1234]

Trig is so much better than PyFAGoras.

[alepov]

its not easier.. pretty much the same

he just consistently used this method

i prefer his method

shoo

[pjtheman1]

the reason he used trig is to help apply the concept of conceptual thinking and help you understand whats going on and why the things work- the pythagorean theorem would be able to do that - but that would get the right answer- but good thinking bkisme

[O3662]

الحمدلله اني فهمته بعد جهد

الله يجزي علي واستاذ ظاهر الديك عنا كل خير

[TruthLogic]

fact: collapse could not have Gained Momentum if the lower floors were to put up any resistance

fact. The Onset of collapse defies the Law of " Angular Momentum"

fact: No transfer of momentum sideways possible with Only gravity

fact. Momentum of "pile driver" could not be maintained if material was being ejected side ways

fact, Object 5times smaller in mass will not go through a object 5 time larger( gravity )

Fact 600,000lb steel beams can not be moved 400 feet side ways by Gravity alone

[Kerpal2253]

Truth: In science, the simpler explanation that can make predictions when. In civilization, people only care about the gun to their heads whose owner whispers - the complicated answer is the correct answer.

Fact: A steel tower had never collapsed before 9/11 due to fire.

Fact: Bush admitted that explosives where used in justifying the interrogations of a Sheik [Mohamed?]

People don't care about Facts, they are driven by the truthful forces.

[Dan4157]

but good sir, that makes too much damn sense!

[Nutterbutterz95]

"Soh Coh Toa, in blood red".

Was that even necessary? Lol.

I love your videos. Honestly, you're an amazing teacher.

[USMChiLD]

Thanks Sal.

[aferreira917]

What this guy do is a really good job.

If you can help someone out, you are a good person. But if you help people all over the world, you are like an angel.

[aubreydavid]

out of curiosity...y would u want the universities to go bankrupt??...U may have a valid reason, but, I'm asking..

[tttar]

I can't wait until people like you bankrupt the university system. :)

[ullasrajchellappan1]

@tttar i love your reply..for the fee the universities are charging i dont blame you..universal knowledge is only universal only if you have money..what a waste!!!

[dannypoissant]

@tttar University of California system is already bankrupt. That's why I'm watching this video in the first place. 

[ishan1game]

@tttar you are learning all this in a university i am studying

this in 11th class

[tttar]

@ishan1game I was talking about his whole series. I don't know how I stumbled onto this one. I of course hope he bankrupts the rest of the public school system also! ;-)

[The3nlightened0ne]

@ishan1game They review all the basics in university to help you, but they expect you to understand it within the first day of the presentation while in high school they give you too much time to understand simple topics like this.

[KillerZero259]

@tttar LOL!

[joeluv1972]

Thank you so much! Without you I would be confuse from my physic instructor. I truly love your explanation and the way you teach it to us. We are truly blessed to have your generosity of you sharing your knowledge of your gift.

[EMOSrFAGS69]

@ TruthLogic- Fuck you. Your so dumb. We are talking about physics, no need to spread your shit conspiracies around youtube.

Good vid.

[TruthLogic]

EMOSrFAGS69

I must admit I was manipulated into beliving in a conspiracy,,, the same one in which your mind had been fooled into thinking.

Yes lets talk Science

Q, can Jet fuel burn hot enough to melt steel? ( A= NO yet we have tons of motlen steel at all 3 skyscrapers )

Wake up pal you been lied to!!

[Nutterbutterz95]

The truth of what actually happened to the World Trade Center is of no relevancy to this video, and is technically spam.

Regardless of how convincing your arguments are, stop spamming physics videos.

[TruthLogic]

the events of that days and all the wars waged after it have effected nearly all off us,,,

my spaming of these vids is to make sure as many people as possible are exposed to the truth,,

i find that people who possess some sort of intelgince tend to be the people who can best accept the facts when presented to them...

physics proves wtc were brought down by C.D

[Nutterbutterz95]

*sighs*.

OK. Let me try this again.

People with "intelgince", or rather, intelligence, DO CARE about it. We just don't want to see it on this videos. We're all aware of the theories involved with what really happened to the WTC, and if we're interested in it, we'll look it up. You're not opening up any eyes, only irritating them.

Stop with the spam.

[TruthLogic]

nutter...

if you dont like reading my so called spam, please move on to another vid..

welcome to the world of cyberspace were privacy or what we what to see is not always possible"!!

[Khamul]

"Your so dumb."

I just want to point out, EMOSrFAGS69, that "your" is the possessive form and "you're" is the contraction for "you are." I'm sure you knew that and were probably in a hurry to get to an emo-burning party, but in the event that you actually don't understand contractions or basic English grammar, I just wanted to help out.

[EMOSrFAGS69]

actually i was gonna go fight a couple emo kids down at the hill, so i guess i was in a hurry. im sorry for my grammatical mistake

[Nutterbutterz95]

You say you're sorry for making a grammatical mistake, yet you type up a thousand more. Lol.

[EMOSrFAGS69]

Don't think you're a smart ass for pointing out grammatical errors, OK. This the god damn internet, not school.

[amn4ak1]

khan, i love you and im a huge fan, just one thing that ticks me off is that you talk alot. and repeat alot. its annoying sometimes . its like listenin to physics on a radio.

[joeluv1972]

amn4ak1! Keep your negativity to yourself. If you have problems with the way hes teaches then teach yourself physics.

[megaelliott]

He does that to try to give people intuition.

[Ren520]

dear, he talks alot because he wants the learners to get exactly of what hes saying. some are slower learners, some are faster.

if u dont like it,then dont watch his vids.

don't get me started :)

[1a1a2a3a]

I was sooo confused until you told us that the 30 degrees was given

[ua24986]

he always says, "I'll see you in the next video" but actually only talk to us, I wish he showed his face...I would like to see this professor!

[iiVI251]

there's a video of him on CNN, look at the channel

[fc007]

i thought tension was just a pulling force

[Nutterbutterz95]

It is. What made you think it wasn't?

[bangalirussian]

salman khan u r da best homie....

[neufahrn80]

you are the man for doing this, thank you!

[XH1tokiriX]

great way to study for mid-terms.

Thx!!

=]

[Rain0nM3]

soh cah toa in blood red XD

[Mizumi17]

hahaha

[bryanferrell]

@Rain0nM3

SOH CAH TOA, in blood red!!!

[bryanferrell]

@Rain0nM3

SOH CAH TOA, in blood red!

so funny

[bacalao200]

thanks so much man

[harpsichord1]

Watching these videos for review, I already know a lot of the stuff, but for some reason, I just don't always remember when I'm looking at it on paper.

These vids are great, I'm so happy I found them online. Thanks to whoever posts these, you're helping hundreds if not thousands of people.

[Miodoll]

wait, sal i'm confused on the second part of the problem, the t2 cosine, for some reason when i did it I got t2 = 200 root 3 over 3...... how did you get your answer? btw i love you videos, you get me A's in all my penn state courses. You rock.

[zzzbambamzzz]

It would be less confusing if you put the sum of all forces in x equal to mass X acceleration...then since their is no acc. ma = 0. Sum Fx = T1cos30 -T2 =0...same for y. essentially another step but it's worth it. Also if you keep the T1y over weight it shows the tension much better....although it's good to show the vectors a dotted line would make the diagram more helpful

[cubesolver]

I like how the 30 degree angle is larger than the 60 degree angle