Intro to springs and Hooke's Law

[sakirhossain]

When u pulled the spring 2N to the right the Resistance force is -2N. and since you move 1 meter,

F= - K X

-2N= -k * 1m

k= 2 not -2

[Munsonelli]

Why worry about tenure? Just make Youtube videos.

[WinnieTheDonut]

Can you please make a video on Forces and Collisions?

Thanks! :))

[MW3ModzMW3]

thanks for the subtitles, i learn better by reading than listening. but both is just heaven lol

[Stickbabiga]

Why do ALL educational videos teach people more in 10 minutes than their teachers do in 10 days?

[lost4468yt]

@Stickbabiga I've noticed that teachers can teach people in 10 minutes as well, you normally see this when someone hasn't been in for whatever reason, I don't quite understand but I believe they take a lot longer so everyone has a good grasp of it.

[chetes15]

@Stickbabiga Is the same as if you go and ask your teacher personally, he will explain the whole class in less than 5 min



[Cosmicwinds]

Its a shame he goes into much more detail on other topics but he cover just the tip here.



[theTuber012]

so when going to the left its negative and to the right its positive. am i correct

[narcomanel]

that's some huge spring.

[yadidiBLOOPBLOOP]

very unprofessional... no preparation.

[CaliDollxo]

@yadidiBLOOPBLOOP

I disagree. I wouldn't call it unprofessional, I would call it conversation. I actually like it, he sounds much more friendly than do many others in their tutorials, which helps me focus. I suppose it's just a matter of preference.

[MattyHild]

Would gravity have the same effect on a spring that is attached to a roof/ceiling?

[slownightsolongg]

@LOLzxcvb the spring constant, its different for different types of springs and shows how stiff a spring is.

[SpankAgoose]

Can you make video about elasticity please?

[dravidr007]

can u go into finite element analysis

[ullasrajchellappan1]

All your videos there is one thing common...at some point in the explanation you hit the bulls eye of explaining the logic behind the topic..that makes it interesting rather than blindly bye hearting the formulas...Thank you very much..

[scarykidbryan]

I like khana, but all of his videos are simple and I'm taking college physics courses so they're not of much help for me.

[tony86482]

@scarykidbryan No need for any negative comments. His math/physics related videos are meant for highschoolers and intro courses at college. If you want help with higher level classes, check out MIT's OpenCourseWare. ocw.mit.edu.

[CeaseFireTheAncient]

Thanks so much for this video. It was a huge help. I was having troubles understanding the logic behind the formula. I now understand it enough to actually see the logic. Thanks for creating this video- It's hugely appreciated.

[bluejimmy168]

so is the force constant ?

[NPowah]

@ mygremg

Sal is actually correct, since he is discussing the Force of the spring, which is F = -kx

[Breaker5764]

@NPowah But spring force should be in the opposite direction...I thiink Sal is wrong, because the APPLIED force he used was (+2 N) and the restorative force (spring force) he put down was (+2 N). He's solving for K, so conceptually, he should put down the correct F to get the correct K. If he was solving for F, then yea, the (-) would factor itself in to get the spring force (F) in the opposite direction and all you would need to worry about is getting the correct sign for distance.

[BengBengCat]

Thanks so much

[dalcde]

He actually compressed the spring by 10 meters!

[anax22]

i wish u were my Dr instead of that gay that know nothing and never stop talking

[Shan1993perera]

In the last question u consider ---> as positive or neg.....anyway is this way is correct way

As F = -kx -2 = -k1 2  = k

[rangerbsh]

Manny, I am in eleventh grade in high school and videos such as this, or with linear kinematics, friction, force, Newton's Laws, directly apply to what I learn in school at the moment.

[mannyStern]

Sal, I am a retired former physicist trying to relearn what I used to know. Can you please tell me what grade level physics you are targeting?

Since I have not looked or thought of physics for 40 years, I am having a ball with your videos.

[pithikoulis]

thanks loads :D

[mauritani987654]

now was actually really helpful. cheers. :)

i owe u my good mark.

[skyfaze]

hold on a second so is the last question right or is gregme right

[mygremg]

I think there is an error in d last questin Sal solved. the formula is

F= -K x D if you assume d right side as positive and d left as negative, the distance of 1meter is positive and the restored power which is counter to the force we apply should be negative.

-2N = -K x 1m

Which gives us 2 for the value of K.

If you apply -2 as Sal said to the formula

F=- K x D, It becomes F= 2 x D where restored F and applied F end up having same direction

[jc32665]

I agree with mygremg. Still, your videos have helped me more than anything else this semester. Thank You!

[Izorropirate]

can somebody please explain it in 5th grade term? I have to write a sentence or two about Hooke's law for science and im just starting 6th grade

[surroundsound5000]

"Hooke's law states that the force produced by a compressed spring is dependent on the amount by which the spring is compressed. If a spring compressed by 1 cm requires a force of 1 newton, then compressing the same spring by 2cm will require 2 newtons of force."

[Y0uEnj0yMyself]

I already know this

[laputahayom]

so learn something else, continue the quest for knowledge.

[captainspiwtf]

Hey Sal, I remember hearing you say you can code too.

You are a brilliant teacher, could you do some video tutorials on C++ or some other programming language? Its a lot to ask but it'd be amazing... thanks anyway man.

[Mast3rTuba1990]

Love the video made my head not spin. lol. But the thing that stood out to me was that hook found out that there are forces acting upon each other. Isn't that a given that if you have for example 10N of force on something its going to have 10N of force back on you. Idk i thought that was a little silly. but great video really helped.

[pinksugarlylove]

Thank you so much(: Love the video, it really helped me alot A LOT(: May God Bless YOU(:

[MulleDK13]

"If you stretch something too much, it never really goes back to where it was before"... I lol'ed xD

Awesome videos, btw. Keep going!

[volintine]

thnx sal

[SupremeCoalition]

thank you! very useful.

[lunolol]

interesting.