Hello! Not using Newton's F = ma, allow me ask: 1 - Where does the { Action = Integral (K - U)dt} come from? 2 - Where does the {Lagrangian (K - U)} come from? 3 - Can I deduce that I must minimize the Action integral equation from minimizing the potential energy U? 4 - Can you elaborate? Thanks!👋

maannn this video is very helpful for meeee thank you very much sirrr😁👍

How did you make the videos on this channel did you just screen record your computer whilst you explained the concepts?

Petition to start calling it “upside down e” instead of “curly d” when?

@3:00 when did the derivitive of the square become the square of the derivative? What you are claiming is d/dt (x^2) = (dx/dt)^2 really? I thought its 2x dx/dt, by the composite function therom. So you are saying 2x dx/dt = (dx/dt)^2 for all functions? REALLY?!!!

Okay ... The IC point I give you. But how do you know what the end point is apriori? Newton only requires IC. In contrast this is a BVP and so requires more knowlege apriori to tell you the evolving physics.

S, i believe, because historically this intergral was associated with length (ds) and that was denoted as ds, integrated S. And the idea of shortest path comes from Hygen's principle that light travels shortest distance. But its also L or H.

thanyou. Its a great video it helped a lot

Can someone please explain how to get the constant C in 2:20 ?

But you can get from the time independent from the time dependent using separation of variables in some cases, there is relationship here...

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Can you please make a video explaining how too Calculate the temperature of a Planet in Synchronous rotation With the Sun?

How's that tensor notation

Please explain what the eigenstate and eigenvalues are, for a beginner like me. Thanks.

Thanks for uploading. Studying Microeconomics I, I needed to know dhis, however my curriculum did not include multivariable calculus, which is not only stupid cramming, but also sad as I love math as well

then matter prefers rest to movement, why?

It must be called the principle of least energy because action is a force. can we arrive at this principle starting from the forces applied instead of the energies?

Very good explanation. I just realized that any state could be written as a linear combination of eigenvectors

Wow someone else draws Xs the same way as me

why is there no square around the brackets in T1 = m/2 (x1-dot-square - y1-dot-square) ? Isn't this velocity that need to be squared because it's m/2 v^2 ?

never thought someone would make a general explanation of something so easy without first using real numbers to show the process

Make you feel so good about the derivation of Taylor expansion. The integration method makes perfect sense than the approximation method from a constant then a straight line and parabala etc. Beats all other clips on the topic. Thank you so much.

The Principle of Most Action is moshing your way around a nightclub or stadium.

Physics University student here, love this video.

simple and intuitive, thank you!

now the channel is at 1million+ subs

Educational value of the Video is Zero!

The number of people in this comment section who don't understand the purpose of this model is wild lmao. I needed some help double checking my balancing for this model - much appreciated!

can you please make a video on surface tempt if there are n number of layer?

thank you for sharing information.

thanks!

It helped in understanding their different uses. Thanks.

At 14:13 is that the Laplace equation?

Magnificant explaination mate, but how does the equation about the full derivative with respect to x and partial one with respect to x proven(the one in upper-left)

thanks sir you are awsome

THANK YOU SO MUCH!!!!!!!!

awfull thing ı dont understand anything ...

Can you kindly explain how to apply these formulas differently and perfectly in solving physics problems

Very thanks as it is useful to me for answering physics Olympiads

Nice intuition, but the fact that A has to have units of v^2 still doesn't say that it's just v^2 and not some proportionality constant times v^2.

By reflecting away 30% of the incoming solar energy the albedo makes the Earth cooler than it would be without the atmosphere much like that reflective panel behind a car’s windshield. The non-radiative heat transfer processes of the contiguous atmospheric molecules render “extra” energy upwelling from the surface radiating as a LWIR black body impossible. For example, the 396 W/m^2 upwelling from the surface is a “What if?” theoretical calculation without physical reality. (refer to: TFK_bams09) Without the 396 W/m^2 upwelling there is no 333 W/m^2 GHG energy up/down/”back” LWIR greenhouse gas loop to not “warm” the terrestrial surface. The greenhouse theory and man caused climate change are negated by any one of these three points. Hysterical speculations over sea levels, ice caps, glaciers, extreme weather, etc. are irrelevant noise. Zero greenhouse effect, Zero CO2 global warming and Zero man caused climate change. Version 3.0 090321

What u using to write?

the last part explanation was so good.thank you so much

So, is this "delta" used to 'scrap' any multiplications that give 'no value', with the intention to make it easier to calculate?

It clearly shows the analogy between the shortest distance between 2 points problem and the least action problem. Thanks for this!

Ты крут

this is awesome. Maybe "Action" in French starts with an S.

You explained concept of eta very well. Thanx

Wait just realized you're primer haha

damn leonardo dicaprio getting some action