First Law of Thermodynamics : sign convention for WORK

[@shejaldoiphode2723]

Sir please continue to give lectures like this , we indeed this pure knowledge instead of unnecessary motivation. Beautifully taught

[@Physics_seeker]

If Quantum physics fascinates you then give this channel a view kzbin.infoUADquGe0QZs?si=gnytpbWn3XCehwab

[@sohamadak6811]

I had this very doubt since a year, and never got a satisfactory answer from anyone, thank you so much sir

[@dinokiller9186]

A great explanation... No body has given the right explanation to me until I saw this video🙏

[@hcverma2928]

Great. If you go from the basics, things are easier.

[@MaheshKumar-lx1ku]

​​@@hcverma2928sir I have a doubt on worked out example 13 of chapter circular motion from concepts of physics. I want to solve this problem from ground frame but am not able to do that so I request you to make a video on this. It will be very helpful for me. Thank you ❤

[@dinokiller9186]

@@hcverma2928 Yes Sir

[@sachinray7642]

Rajwant Sir had also explained us like HC Verma sir..... 😅

[@garvyadav4171]

@dinokiller9186 Read NCERT, you will get this explanation there.

[@deepakpeaky]

Sir, you have cleared the most confusing thing in the whole syllabus. Even teachers (School & Even famous teachers in Kota too) are not clear on this part, whenever we ask them they say learn that signs are opposite in Phy & Chem or they say some random stuff to confuse us. Today i got to know the real truth. Thanks Sir ❤

[@Nik-x1i]

It's first time i watching your video and believe me you are now my god of physics I have totally understand this topic. Great explaination.

[@MokshitArora.]

I used to mess the answers due to this confusion of sign convention , thank you sir for clarifying this 🙏🏻

[@physicsbyatul]

Just imagine how lucky are the students who actually studied from sir ❤

[@aliff5878]

But i am Too late 😭😢

[@JustinDegryze]

My chemistry teacher was your student and is a brilliant teacher who keeps talking about you all the time 😄

[@AdityaRaj-xo3hn]

I have your two huge physics books in my bookshelf. Glad to see you in a video. Bless this young neet aspirant😌

[@SahilKumar-vh9is]

sir you are my favourite teacher i have been started watching your videos from class 7 when my science teacher told me about you and now i am in 11th and still loves you alot and i want to meet you atleast once in my life love you sir❤❤

[@hcverma2928]

All the best

[@MenamPatir4912]

Thank you very much Sir❤. I was having this confusion from my higher secondary days only. And now I m pursuing engineering and was searching for this concept like a mad man. Finally I found your video today and now my concept has been cleared. Once again thank you very much sir🙏❤.I have nothing but only respect for you Sir🙏.You are a gem of our country Sir💎

[@manav_rawall]

Good evening sir you are great teacher i am here to tell you i am in class 11 studying physics from your student and my teacher ashwani kumar lamba i hope you remember him he told us many teachings of you too boost are confidence towards physics and to acknowledge more knowledge about the other subjects too thankyou so much sir.

[@ArnabPhysics]

Sir, please continue "HCV ki kahani HCV ki Jubani"... If you find time... 😊🙏❤ Pranam sir.. 🛐🙏❤ Happy New Year... Have a beautiful, healthy and superb year full of Physics 😊❤

[@Physics_seeker]

If Quantum physics fascinates you then give a view to this channel kzbin.infoUADquGe0QZs?si=gnytpbWn3XCehwab

[@godqueque987]

Beast mentality, beast explanation, beast king We are too cool for the summer - rock version - sped up

[@RidhimaSaxena-tj6bp]

What a man he is. So simple yet the best

[@krishnashisdas1606]

Thank you very much sir i felt this like a sore thumb which suddenly got cured out of the blue. I solved the great hcv by myself but still kinda memorised the convention but now the great hcv himself taught me the right way.... Oh almost forgot..... HHAPPY NEW YEAR SIR🎉🎉

[@indianmusiclibrary2077]

Happy new year to you sir in advance !hope you give me blessings for a better future of mine and the world We will prove that the 21st century will be going to be physics century like the 20th century let repeat history 🇮🇳💯

[@jassyrathore8394]

love your method sir

[@GyantiPhysics]

🙏❤ I'm also making a plan to solve all the problems which are given in Concept of physics (HCV)this year (2024) . गुरुदेव के चरणों में सादर प्रणाम । Love you sir and happy new year sir.

[@raghavgadhok931]

Jai shree ram 🕉

[@GyantiPhysics]

@@raghavgadhok931 Jay Shree Ram ❤️

[@n.o.t.important]

I'm from the IT background and went to college 7 yrs ago. And I understood. 😂 I'm subscribing to this 😂

[@UniversityofAllahabadwithAman]

Thanks sir.....,a good teacher makes everything easy....❤

[@funmann1234]

Sir, beautiful explanation. My student years are decades behind me but I still love physics. I have a humble submission. It would be great if you could mention some real life situations while explaining the theory. For eg . , years after I completed engg, I learnt that aerofoil design is based on bernaulli's principle.

[@Paul_inmotion]

Sir you are great I am reading your book HC Verma part 1 . And it is so great to read . Your book is awesome and I love that but many things I cannot understand the exercise questions the hard one of some chapters . 😢

[@teluguamazing5027]

The hairstyle tells us how he dedicate toward the Physics 🔥

[@rahil136]

Professor hc Verma gof of concepts of physics i use for theory your basic concepts of physics abd clearity in your book is mind blowing with crystal clear concepts+ problem solved ❤❤❤❤

[@Rudra_Dev_Jha]

नववर्ष की हार्दिक शुभकामनाएं सर जी! ❤

[@salonigupta5622]

What a explanation skill heads of ❤❤ to you sir god of all

[@umarabdullah466]

Sir where can I get this hair cut ??

[@Shiven914]

A very Happy New Year Sir... May you always be healthy and happy... We all love you a lot Sir ❤❤❤

[@coldblaze6774]

happy new year the great guru HC VERMA ji. 'touching your feet'🙏

[@jessicasajwani5356]

End of the conversation (This whole physics and chemistry delimma of work)

[@adithyababu3217]

Sir god bless you sir. You'll live a thousand lives ❤

[@उस्तादGaming-m3q]

Summary of the video: 1) Work done on the gas contributes to increase in internal energy. And work done by the gas contributes to decrease in internal energy. 2) "Work done by gas is positive in physics whereas negative in chemistry" This is a false statement. Work is a fundamental quantity and it is same everywhere. 3) If Work done on the gas is positive, then it implies that work done by the gas is negative and vice-versa. This creates the illusion stated in 2). Sir, please correct me if I am wrong. Btw this video was most needed, you cleared fundamental confusion.

[@tanishq6628]

This was really helpful sir, thank you so much.

[@Adarsh-q2j]

Sir plz give details about the eddy current and induced electric field in tha chapter EMI.

[@aniketrana297]

Kya explain kiya hai sir ❤❤❤ Na i love this

[@kousikmishra3894]

Thank u for asking this q friend. I also have doubt about this question. And Happy New Year 🎆 🎉 prof.

[@Deadpool_play]

KING OF PHYSICS....HC VERMAJI.....❤😊

[@PrachiMahajan_2023]

If Quantum physics fascinates you then give a view to this channel kzbin.infoUADquGe0QZs?si=gnytpbWn3XCehwab

[@garyfromtheracoonfederation]

Beautiful explanation, know the fundamentals rather than just memorizing the sign conventions

[@PrachiMahajan_2023]

If Quantum physics fascinates you then give a view to this channel kzbin.infoUADquGe0QZs?si=gnytpbWn3XCehwab

[@swastikmukherjee9455]

Great explanation sir .. Sir Could you make a clear conceptual understanding of pseudo force and its applications

[@OfficialSaudRaza]

Sir I'm a great fan of yours. Sir with due respect I want to ask that when is your 2nd Volume of Bhautiki ki Samjh launching??

[@hcverma2928]

May be in 2024 sometime.

[@musicallife7629]

Sir pls make a video of brief explanation of torque I always confused in the question in which torque is used In current. I am in class 12 There is also use of torque in electrostatic and magnetism So pls make at least one video😢😢😢😢😢 From Varanasi

[@Joydip_Mandal]

Sir, I have a question related to the Charles's law and cosmology. From Charles's law, theoretically it is possible that the volume of any gaseous substance can be zero at the absolute zero temperature. So if we imagine a gaseous substance at absolute zero temperature, it will have some mass in a point (as the volume is zero). At this condition, can we consider the massy point of the gaseous substance as the singularity of black holes or the singularity during the Big Bang?

[@dr.aryanjangir07]

Charles's Law is applicable to gases within a specific temperature and pressure range. At extremely low temperatures near absolute zero, other factors come into play, including quantum effects. The singularity in black holes and during the Big Bang are concepts that involve extreme conditions where our current understanding breaks down, and we need more complete theories, such as quantum gravity, to describe them accurately.

[@HitendraRajput01]

Your book is so difficulty but you are very easy thanks sir

[@cbsir2546]

Sir when is coming your bhautiki ki samjh part2....🙏♥️🙏 please tell me

[@MaheshKumar-lx1ku]

​​ @hcverma2928 sir I have a doubt on worked out example 13 of chapter circular motion from concepts of physics. I want to solve this problem from ground frame but am not able to do that so I request you to make a video on this. It will be very helpful for me. Thank you ❤

[@windows-zm2cj]

In chemistry always we are assuming extrenal pressure direction towards gas so if work done on gas both will be in same direction so work will be positive.

[@MadhurShrivastav-r9x]

Great explanation ever❤

[@PrachiMahajan_2023]

If Quantum physics fascinates you then give a view to this channel kzbin.infoUADquGe0QZs?si=gnytpbWn3XCehwab

[@StudentLife-b6t]

Helo sir, physics numerical kasie solve kare

[@santoshjagdhane6287]

Taking 1 ly = 9.3 multiply by 10 raise to the power of 15 m and 1 day = 86,400 s , express the speed of light (= 3 multiply by 10 raise to the power 8 m/s raise to the power -1)as ly (day) -1 and speed of sound in air (= 330 m/s raise to the power -1) as ly day raise to the power-1. Also find the ratio of those two values.

[@spreaduniquefacts6609]

Thank you so much professor ❣️🙏🏻

[@ankitanand4101]

Sir your explanation cleared my doubt thanks sir😮

[@yuwankgoel4014]

Namaste 🙏sir I am Yuwank Goel and I am a student in class 11 from U.P please explain the Bernoulli Theorm I watch so many videos but I am unable😢 to understand😢.

[@dr.aryanjangir07]

Hello, my name is Aryan and I am a student in 12th grade from Sikar, Rajasthan. I have a question that I was hoping you could help me with. If we define a wave as a disturbance in a medium, then why do we refer to light as a wave even though it travels through space, which is considered to be medium-less? If there is no medium, there should be no disturbance and thus no wave. Thank you for your assistance.

[@sunitajangir6807]

May be becoz of partical nature

[@iuoyo4707]

Mechanical waves are defined as disturbances in a medium . In general wave is a phenomenon that can transfer energy and momentum via periodic variation of some quantity . In case of string , varying thing is displacement from original length . In case of sound waves , varying thing is air pressure . In case of light , varying thing is electric and magnetic field . Yes , electric field and magnetic field is varying and travelling as a electromagnetic wave . Thinking it without no medium is a bit tough even for Maxwell . He himself thought of EM wave as stress and strains through a hypothetical medium of ether . But in reality , there is no medium needed to vary magnetic and electric fields .

[@shaanIITP]

Bro light is an EM wave And EM waves don't need any medium to propagate And by the way light shows dual nature... sometimes it behaves like a wave and sometimes like a particle...till now its a dilemma Some phenomenon like diffraction polarisation can be explained by wave nature of light while refraction reflection and related phenomenon can be explained using particle nature

[@dr.aryanjangir07]

thanks man @@iuoyo4707

[@Divyansh-bp8ni]

Thanks sir you and your book never get old❤

[@AshVik77]

Sir how can I contact you ? I have certain doubts in physics...

[@devsucksatlife]

Sir, HCV stories ki kahani aagey badhaiye 🙏

[@abc_whatever5976]

Please make a short course on thermodynamics. Thanks❤

[@literallyfantastic2144]

Who all agrees that this topic could not be explained in this format much better than HCV sir ?

[@darshans1194]

Heartiest Best wishes for the new year Guruji

[@aryandas5643]

Sir can you pls make an explanation video on Animation vs. Physics by Alan Becker?

[@kshitijgupta9271]

Thank You very much sir

[@4फेज]

Guru ji aapko kuch batana hain par kaise bataye

[@krishnamurthymalyala7322]

Sir can u plz explain chapter gravitation

[@mellow_madhu]

Sir please upload complete class 11 and 12 physics for neet

[@himanshu-goswami]

I am Himanshu Kumar and fan of DR. HC Verma ji.❤❤❤❤

[@PhysicssimplifiedbySunilBalani]

The simple explanation is in physics and engineering the main focus is on how much heat can be converted into work whereas for a chemist the domain of interest is how much heat can be converted into internal energy . An engineer would be more than happy to see as much of heat converted into work in contrast chemist studying molecular properties would want as much of heat converted into internal energy as possible .

[@PrachiMahajan_2023]

If Quantum physics fascinates you then give a view to this channel kzbin.infoUADquGe0QZs?si=gnytpbWn3XCehwab

[@Lbverma123]

Sir लोग कहते हैं कि जब कोई व्यक्ति अपने सिर पर कोई वस्तु (भार) लेकर जा रहा होता है तो वह mg के विरुद्ध बल लगाए रहता है,और आगे की ओर चलता रहता है जिससे F,d ke बीच कोण 90° का बनता है और work done by man =0,but ham ye nhi samaj pate ki जो बल उस वस्तु(भार) पर कार्यरत है उस बल के द्वारा वस्तु में तो कोई विस्थापन नहीं होता है तब थीटा=90° कैसे ho jata hai {please postmartem this problem}.

[@samarjitdasIISERkol]

Thank You For your Videos Sir And a Very Happy New Year to you Sir 🙏🎆

[@aparnasharma7760]

Can we say that in chemistry we deal with real gases since bonds come in picture (when bond number is 1 energy consumed is positive).in physics we deal with ideal gases,perfect gases not real gases where work consumed depends on pressure.and hence the direction of force.

[@hcverma2928]

Not at all. These. concepts aree valid for all gases, ideal or real. Look at the arguments, nowhere we uses ideal gas approximation.

[@cosmo-guyy]

nice explaination sir

[@hcverma2928]

Thanks and welcome

[@rajeshsewda9219]

Ustaad.....❤

[@shubhshandilya16]

Very basic but best explanation ever done 🤍🤍

[@shubhgupta6064]

Sir I do have a question which was asked by me on 29 of Dec you were in IIT Kanpur L-16 about the spin of electron Why its spin is quantised I will be very grateful if you please answer

[@sumitpatel9741]

Hey,H C VERMA Really Nice Video! I was wondering if I could Help You Edit Your Videos And Make Highly Engaging Shorts Out Of Them.

[@ankitverma891]

Sir pleased neet aur jee ke physics ka batch launch kijiye

[@Kr_Vishal_001]

I have a doubt from gravitation topic :- The centripetal force of sun 🌞 is greater than the Earth 🌎,,then why moon move around to earth,not Sun?? 🤔 Plz answer me

[@Harshit-lv1fw]

hello sir myself harshit and im studying in 11th sir can you make a dedicated video on fundamental mistakes which a student makes in physics as it will help us solving sums and all. thank you sir

[@AyushK-ii7rz]

I wonder how many students have still not seen this video and are still in doubt , sir very well explained👍👍👍👍

[@funwithfacts9489]

Question - isolated system me time ka koi effect nahi hota hai to system + surrounding= universe to ek istolated system hai or isme earth bhi aata hai to earth me time ka kyu effect hota hai sir plz iska answer batadijye

[@pushkar_neet]

Thank you so much sir 🙏 my confusion was cleared

[@adityaprakashyt893]

Thankyou sir, wish you a Happy New Year

[@Pranjal_singh12]

Namaste sir I'm from mumbai i had a question in my mind that is if the particle on space fabric which causes singularity at that point it is possible that at point of singularity there dimensional portal which link our universe to parallel universe or may be can cause opening of worm hole

[@JayramPotphode-se5vh]

Nice teach method sir

[@Ajayyadav__23]

Sir could you please make all the video lectures of class 12th physics.. 😢😢😢plss sir

[@Chemophile]

Why can't we just argue simply that if work is done by the system then ∆V = V2 - V1 is positive because V2 > V1 So P∆V will also be positive. Similarly if work is done one the system then ∆V = V2 - V1 is negative because V2 < V1 So P∆V will also be negative. Please let me know about it because in this case there will be no need to consider the scalar product of Force and Displacement.

[@thirunavukkarasuarunachala4831]

yes sir. its more clear. scalar product need not be used here as done by HCV sir

[@anuragtiwari5034]

Padhai chhode itne din ho gye sir ki class lene chala aata hu 😊

[@goutam9328]

Sir I and all students wants that you start a physics seríes course for all students who want to understand the concept , the mystery of this physics . This way all students would a physicst in future . It is our humble request. Plz

[@random-z4m9e]

I do the same like this I even do not know much about work energy theorem like thing(it is very confusing) energy conservation work every where very well but it really hamper in board examination when they ask about work energy theorem instead of its applications.

[@netreshsingh3048]

Good Afternoon Sir, I am Netresh Singh, I am 18 I have a deep interest in physics It is said that to change the direction of velocity there must be a component of acceleration perpendicular to it, then how is velocity reversed if a person is travelling in straight line with velocity and acceleration in opposite direction then there is no component perpendicular to it.Why does it gets reversed?

[@praneelbhattacharya9530]

Liked your question very much so felt like providing my understanding here. Before coming to the specifics, let's agree on what a vector is. So, a vector is a quantity defined by a particular magnitude and a particular direction, which is sometimes called the sense of a vector. Thus, we can make a proposition that: when we say a vector changes in sign, it means either it's a change in magnitude in an opposite direction (as magnitude has only two directions:it may increase or decrease) or otherwise ,it is a change in the direction or sense---- any one of these is necessary to make a vector change it's sign. In the first part it's true that in certain cases, such as uniform circular motion, velocity and acceleration can be perpendicular to each other and that changes only the velocity's direction. The speed remains unchanged, only the direction of velocity. The perpendicular (or normal) acceleration changes the trajectory, and that is all. It's because if you have a component perpendicular to a vector, it has no effect on your magnitude, so the change only is in the direction. This is the understanding that one must have for case 1 which you said. Now coming to your second part: say your initial velocity is 'a' m/s in x direction. Now if you have an uniform acceleration which is in the opposite direction in that same line, it means that with increase in time, the magnitude of your velocity decreases (as acceleration = change in velocity from final to initial state/ time). So if your velocity continuously decreases with time, there will be a particular instant when the velocity becomes 0 from its initial 'a' value. On applying further acceleration in opposite direction, the magnitude of velocity now will be negative! Equivalently this can be thought of as some vector which has an increasing magnitude in the opposite direction. So vectorically it means your velocity direction has reversed! Summarizing: the first case of uniform circular motion considers the vectorial change in velocity by considering a change in the initial velocity's direction only and not the magnitude- hence the acceleration vector is perpendicular to velocity vector. While in the second case, the acceleration vector lies anti parallel to a velocity vector and vectorially changes the velocity by changing the magnitude in the opposite direction. Hope that clears it! Regards, Praneel

[@netreshsingh3048]

@@praneelbhattacharya9530 yeah it did thank you so much♥️

[@mukeshtiwari1095]

Sir what about cyclic process which is clockwise then work is taken to be -ve and for clockwise taken out to be +ve please clear my confusion

[@random-z4m9e]

sir my first question--- in classical mechanics we can solve every question from newton law of motion a subset of these questions we can also solve by energy conservation which lead to clear that energy conservation should be a result of newton laws but i have tried to find derivation of energy conservation by newton law of motion but i only found derivation which is given in some specific context(not in general case). my second question-- when we look in quantum mechanics conservation laws(energy conservation and momentum conservation) are valid even if newton laws are not valid(but how physics community accepted that. i have a idea with which you can clear our this kind of question with minimal efforts from you i am giving this idea in last paragraph please try it or suggest some resource which already done this ) idea is to create some recourses where we get the all pure physics happenings(not including things like how we found the speed of sound because that is formula which is for very specific context not useful in understanding of theoretical physics but include any experiment if it helps in understanding of theocratical physics) to respect your time we only need name of topic and findings in sequence of time of finding this help us in get to know how physics really developed with time and why physicist defined some particular quantity.

[@iuoyo4707]

Answer 1 - Every problem can be solved both by Work-energy theorem and Newton laws of motion . The one we use depends on the information given in question . You can easily derive energy conservation or more generally Work-Energy theorem by newton laws . You can search Derivation of work energy theorem on net and see . When only conservative forces are present . Then energy conservation happens , a sub case of Work -energy theorem . Answer 2 - You can get a timeline on wikipedia . Also about the part where u said "How could physics community accept that!!?" . As long as their is empirical evidence for their theory or claim and also has a satisfactory framework . Science will accept that . When newton suggested that fallling apple and moon revolving are same phenomenon he gave evidences for it , so science community believed it .

[@random-z4m9e]

@@iuoyo4707 thanks

[@sachinrajpandey5242]

But at some place heat given to the system is taken as negative and heat taken out from the system as positive, it seems contradictory, isn't it. Please explain Sir.

[@subhajittalukdar3727]

Happy New Year Sir and all my lovely friendssss❤🎉

[@DeepakParmar-th2gw]

Namashkar sir I am Deepak ,(class 11th) Sir jab hum ik ball ko horizontally ghumate hai apne upar jo ki string se bandhi hue hai to jab wo Puri tarah straight ho jati hai tab tention ko to mrw²balance kar leta hai lekin us samay gravitational force ko konsa force balance karta hai jisse wo ball niche nahi aati

[@iuoyo4707]

The rope cant be fully horizontal , it will be tilted downward so that a component of tension balances the weight

[@shaanIITP]

Bro the string can't be completely horizontal as some component of tension is required to balance mg

[@jaiomprajapati5198]

Happy new year sir ❤

[@AbhishekPandey-ln7le]

Today my first law is cleared without any doubt

[@raushan-696]

Sir meri Ek question ka jawab do n Ki why is nuclear force not work as central force?.

[@CipherNocturne]

Respected Sir, I am a 10th-grade student. I kindly request your consideration in creating an educational video on electromagnetic waves.

[@aban_abdeh]

HAPPY NEW YEAR😇 Sir how to study physics for NEET-UG? Because when I try to solve the questions, I cannot do it, that means I have to take help from teachers to solve NEET previous questions

[@tnisx_15]

well try to solve jee mains level questions