Block over Block Friction (Part-2) for JEE(Adv) | Class 11 Physics in Minutes|

[@physicsgalaxyworld]

Practice Questions for students on concept of above video. Students are required to solve these questions and verify the answers given. Out of below given Solve the question, in ONE question given answer is wrong. Solve and post that question no of which answer is wrong and post the correct answer in comment section for discussion and verifying your result. In all below questions take g = 10m/s². Q1. A 4kg block is placed over 5kg block on a smooth ground. Friction coefficient between 5kg and 4kg is 0.5. A force F is applied horizontallay on 5kg block. Find at what value of F sliding will start between the two blocks ? Ans [45N] Q2. A 4kg block is placed over 5kg block on a smooth ground. Friction coefficient between 5kg and 4kg is 0.5. A force F is applied horizontallay on 4kg block. Find at what value of F sliding will start between the two blocks ? Ans [36N] Q3. A 5kg block is placed over 10kg block on a smooth ground. Friction coefficient between 5kg and 10kg blocks is 0.2. A force F is applied horizontallay on 5kg block. Find at what value of F sliding will start between the two blocks ? Ans [15N] Q4. A 10kg block is placed over 20kg block on a rough ground. Friction coefficient between 20kg and ground is 0.2 and that between the two blocks is 0.1. A force F is applied horizontalay on 10kg block. Find at what value of F sliding will start between 20kg and ground then at which value sliding will start between the two blocks ? Ans [On ground never start, between the blocks at 10N] Q5. A 20kg block is placed over 20kg block on a rough ground. Friction coefficient between lower 20kg and ground is 0.1 and that between the two blocks is 0.6. A force F is applied horizontallay on upper 20kg block. Find at what value of F sliding will start between lower block and ground then at which value sliding will start between the two blocks ? Ans [40N, 280N]

[@abhiramdharme3117]

All are correct

[@physicsgalaxyworld]

No one is incorrect !

[@bhaveshiitkanpur3329]

The answers for question no.5 are 40N and 200N

[@nandkishorkhaire7618]

Question 5 both answer are 200N

[@nandkishorkhaire7618]

And in 4th question I think the second part answer should be 15 N sir

[@yatharthdubey8358]

Correction ,F=200 N for sliding between blocks not 280 N,Thank you so much sir and you team for helping us in concept building.

[@manaspatil3996]

Just when you think a man cannot be any greater, Ashish Sir pushes the limit further. Need Work Energy next... Also 2021 Strategy...

[@vyankatiingle8819]

What are u doing now in 2024😊

[@ranjitkalita3734]

Sir you are a GOD 🧚🧚 for students from rural areas . Thank you sir🙏🙏🙏🙏

[@harshjha7685]

Very true..😊

[@shivendrasingh3318]

Why only for the students of rural area,????

[@spiritualindia5881]

Yaaaa

[@Uddaybhaikabaap]

Sir this physics in minutes series is awesome sir ❤️❤️ I owe you my greatest respect and admiration for the selfless service sir Thank you sir❤️

[@sachinvarma8773]

Physics galaxy is a life saver... really a legendary channel. 🔥🔥 thnx team PG

[@arshadmuhammed3261]

Sir you made me fall love with physics

[@akshayanandtiwari]

When force reaches 40N downward sliding starts and when force is 200N there will be relative sliding between both blocks

[@manishabhatnagar6719]

Sir please make a playlist of this series

[@shinigami_1]

Done now..

[@Cric_sansu]

@@shinigami_1 what is name of this playlist

[@omraanedits6374]

Make a playlist of this series...

[@raju6156]

Teacher ho toh ashish sir jesa!

[@physicsx8100]

Question no 5 Answer 40 , 200

[@physicsgalaxyworld]

Thats right ! Good going !

[@udaypatil1764]

Hello sir, I have one question to you..... Why you are not starting the Daily Live Courses for NEET & JEE aspirants? I asked you this question , bcoz I found that you are the only teacher who is teaching with better understanding without wasting time....... By the way, you are 'Bestest Teacher' of PHYSICS I have ever seen.................

[@shivamverma9447]

Thanks sir❤️😇

[@jeestar3054]

A lot of thanks sir..u are great 🙏🙏🙏🙏🙏

[@abhimanyupareek1618]

sir your method of teaching us is fabulous and u are the best teacher in the world love you sir...........

[@ykrgaming1085]

All are correct 💯

[@ujjwal4896]

Should I practice advance illustrations playlist for KVPY SX ???? And which book I should practice for KVPY based questions. ???

[@physicsgalaxyworld]

For KVPY you should focus on PYQs and conceptual MCQs of PG books

[@Dilip077]

Sir, as far as I know magnet is a type of iron oxide.Then how can it create magnetic field around it? Whereas metals cannot create a magnetic field around it for having same number of positive and negative charges . Apologizing for my bad English. I am from a small village school(Bengali medium).So, I don't know much English.

[@shubhammahajan3745]

Well i don't know ur question's answer but definitely u know English better than those studying in English medium...and let me tell u there is no grammatical mistake in ur comment

[@shivendrasingh3318]

Sir at 2:43,how will both the blocks start moving together. The forces on upper block are the friction and F, and it will start moving only when F will be bigger than limiting value of friction, than how can both the blocks move together as soon as the force F is applied. Please clear this doubt as soon as possible sir. Thank you.

[@गणितशिक्षा]

See at any F , f2 willl act forward on m1 and grou d is smooth which imply m1 will definitely move and since m2 is kept over m1 which imply as m1 moves m2 also moves which imply for any F, system will move !!!!!!😀😀

[@shubhammahajan3745]

@@गणितशिक्षा the question isn't that whether they move or nor but is why do they move together

[@shubhammahajan3745]

@@गणितशिक्षा the question isn't that whether they move or nor but is why do they move together

[@PhysicsbyPuneetSir]

We love u Ashish sir...

[@bhanuchoudhary8796]

Thanks sir 👍

[@romikumarsingh1514]

Physics galaxy is really galaxy for physics

[@ahmadshaikh7494]

Sir now I understood clearly thanks ,and I was able to do all questions.

[@jaynagwani4309]

Dhanywaad sir ji

[@romikumarsingh1514]

Sr very thankful for helping us 🙏

[@11sfhunter47]

Q1. A 4kg block is placed over 5kg block on a smooth ground. Friction coefficient between 5kg and 4kg is 0.5. A force F is applied horizontally on 5kg block. Find at what value of F sliding will start between the two blocks ? Ans [44.1N] Q2. A 4kg block is placed over 5kg block on a smooth ground. Friction coefficient between 5kg and 4kg is 0.5. A force F is applied horizontally on 4kg block. Find at what value of F sliding will start between the two blocks ? Ans [35.28N] Q3. A 5kg block is placed over 10kg block on a smooth ground. Friction coefficient between 5kg and 10kg blocks is 0.2. A force F is applied horizontally on 5kg block. Find at what value of F sliding will start between the two blocks ? Ans [14.7N] Q4. A 10kg block is placed over 20kg block on a rough ground. Friction coefficient between 20kg and ground is 0.2 and that between the two blocks is 0.1. A force F is applied horizontally on 10kg block. Find at what value of F sliding will start between 20kg and ground then at which value sliding will start between the two blocks ? Ans [sliding between block of 20kg and ground will never happen as F1L > F2L , 9.8N] Q5. A 20kg block is placed over 20kg block on a rough ground. Friction coefficient between lower 20kg and ground is 0.1 and that between the two blocks is 0.6. A force F is applied horizontally on upper 20kg block. Find at what value of F sliding will start between lower block and ground then at which value sliding will start between the two blocks ? Ans [39.2N, 196N] Last questions answer is 196N not 280N

[@pushkarrai9033]

its been 2 years since your reply but did you take g=9.8 m/s^2 ?

[@anjanagupta4289]

sir how to get mentorship fromu love u pls tell

[@shahajimadale3262]

Sir ur checklist videos helped me alot. In jan 1st attempt. I was not aware of ur channel. At that time I solved only 9 ques. I came to know about ur channel in April. I watched all checklist videos in lockdown. In Sept jee main i attemped 18 ques of physics. Remaining 7 also could be done. As u mentioned in checklist videos but I couldn't found trigger point at that time. But sir thanks a alot. 🙏🙏🙏

[@physicsgalaxyworld]

Great Suyash! All the best for the upcoming competitions.

[@shahajimadale3262]

@GLOBAL POT 😅😅😅🤣🤣🤣 Hai bhai 16 toh pakka correct hai. 2 me zara idhar udhar hua.

[@chandrakantpatil4203]

Sir kuch jee 2021 ke liye bhi... I love your concepts.. Thank you sir

[@physicsgalaxyworld]

ye hain beta for jee 2021 too Also, aap concept videos refer kar sakte hain kzbin.infoplaylists?view=50&sort=dd&shelf_id=5

[@Narendrakumar-bt9ss]

Sir, oscillation rotation magnetism question for neet, plzzzzz sir...only few days left

[@saivaraprasadkotha1333]

Sir, 5th question answer is 40N,200N Please tell whether I am correct?

[@shahajimadale3262]

Sir 3 block system me problem ati hai. Pls guide sir. 🙏🙏

[@physicsgalaxyworld]

Don't worry about 3 blocks, not required for JEE advanced.

[@physicsgalaxyworld]

Still, in upcoming PIM videos sir will cover these

[@shahajimadale3262]

@@physicsgalaxyworld ok sir thanks

[@abhinavsharma2442]

Pls continue these series not only for mechanics but also for others topics also its a request

[@sejalsangole2527]

In 5th question the answer is wrong.. Correct answer should be 40N and 200N... according to me.. Am I correct?? And Sir thank you so much.. Physics Galaxy has helped me a lot in Physics..🙏🏼

[@physicsgalaxyworld]

Thats right ! Good going !

[@saathviksutarsaathvik_IIT25]

@@physicsgalaxyworld shouldn't F=120N in the last question as 240-120 because f2L=120N???

[@pankajkumarpradhan6333]

SIR I'M FOLLOWING YOUR PHYSICS GALAXY BOOKS BUT IT DOESN'T INCLUDE SEMICONDUCTORS SO SIR PLZ TRY TO INCLUDE THIS TOPIC IN OPTICS AND MODERN PHYSICS BOOK ... IN NEXT EDITION

[@basudevbehera1290]

Lat question i.e fifth question force required to get sliding between blocks is 200N

[@GabbarSingh-td1mb]

I learn the block over block problem from physics galaxy.. Thanku sir and physics galaxy .

[@kumardevada8567]

Sir, when upper block starts sliding on lower block, what happens to the motion of lower block, will it moves or not, if it moves, what is the acceleration of lower block?

[@rekhajain1978]

How to solve q5 part 1....plz help

[@pankajkumarpradhan6333]

SIR I CAN'T FIND THE PLAYLISTS OF HYBRID PHYSICS AND PG FUNDAMENTAL CLASSES ..... SO SIR PLZ HELP ME.....

[@physicsgalaxyworld]

PG Concept videos for class XI: kzbin.infoplaylists?view=50&sort=dd&shelf_id=1 for Class XII: kzbin.infoplaylists?view=50&sort=dd&shelf_id=5

[@pankajkumarpradhan6333]

@@physicsgalaxyworld SIR BUT THESE ARE CONCEPT VIDEOS BUT I NEED THE LINK FOR LIVE STREAM VIDEOS WHICH YOU HAVE NAMED AS PG FUNDAMENTAL CLASSES AND THOSE WHICH ARE HYBRID PHYSICS LECTURES... SO SIR PLZ TELL

[@akashsamanta421]

BHAI TU TYPE KAR , *PHYSICS GALAXY REVISION CHECKLIST* 1ST VIDEO AAYEGA JISME 55 KE AAS PASS VIDEO KI CHECKLIST HOGI , 🤷‍♂️🤷‍♂️🤷‍♂️🤷‍♂️

[@thiscommetwastyped8695]

kzbin.info/aero/PLEmavoh9cLs2gLWHuLl1wLz31r9sHv3vX

[@pankajkumarpradhan6333]

@@akashsamanta421 bhai tu odisha se hai na ??

[@namratabhatta6015]

Thankyou for such an excellent explanation.

[@naitejas5761]

Sir , plz make video of ray optics

[@shawol275]

Thank you so much sir . You have cleared every concept.

[@sarthakverma1513]

Sir checklist videos abhi iss year 2021 aspirants ke liye bhi available rahengi ya phir delete ho jayengi thodi din mein.please clear????

[@gauravsrule451]

Q5) ans is 200N

[@priyagupta9118]

Beautifully explained

[@indianhindistories944]

Nice sir thank u

[@priyanshjain140]

Sir what if more than 2 blocks are there??.

[@physicsgalaxyworld]

It will come up soon...

[@priyanshjain140]

@@physicsgalaxyworld Sir plz also see the COM frame of reference concept!!!

[@diddesekhar768]

Sir very fantastic explanation that reaches eceryone

[@harshitbhalla9274]

Sir I think 5th answer is 40/200 and thats why its incorrect. Thank you very much sir for all these concept videos on physics. They are the best in full youtube.

[@rishabmishra6957]

Thank you so much sir ❤️

[@a2zfreaker729]

those who have disliked has kept their mobile in opposite direction such that it seems to them like

[@jayshreepatil7805]

Sir why you are not taking live cources for jee and neet throughout the year?.......

[@_UjjawalSinha_]

Nice explaination Sir👌

[@debabratapahari1263]

Hello Sir !!! Myself Pratyush Pahari. Sir, I have done many mistakes in class 11 and 12. So, I want to take drop for Neet 2021. If I watched all Concept Videos of Physics Galaxy, Can I score 150+ in Neet 2021 ?? Also tell me what should I do additionally ?? Sir, I urgly request you to kindly reply me. Take my heartiest respect and pranam !!!!

[@DeepakKumar-fi4os]

How much you scored ?

[@harshjha7685]

Q.5 at 200N sliding will start btw the blocks..

[@shubhammahajan3745]

For two block system will both either have common acceleration or one will have some acceleration and other will be at rest???? R there any other cases???? I am so confused about the acceleration......plz help me out with this....

[@shobhitsingh4434]

Huge respect sir

[@shobhitsingh4434]

God level explainer

[@mahendrabhole9997]

Sir please explain BB-2 18th question of nurture class 11th chap- friction

[@mahendrabhole9997]

A block moves down a smooth inclined plane of inclination theta .It's velocity on reaching the ground is v .if it slides down a rough inclined plane of same inclination its velocity on reaching the bottom is v/n ,where n is a number greater then 0 .The coefficient of friction my is given by ........This question

[@Abhijeet_17.]

Sir is this series gonna be chapter wise or topic importance wise . Please reply

[@aryansingharyansingh5750]

Sir what we should refer for class 11 kvpy

[@anishaagarwal7265]

Sir i am not getting answer of Q5 as 40 and 200 My f1 for lower block is coming as 20 and F is 220 Where i am wrong plz tell

[@diddesekhar768]

Sir please explain more than 2 blocks and force applied on two or three blocks in opposite directions

[@nishugupta7729]

In question 5 it should be [40, 200]

[@chetanchauhan2096]

Sir please tell whether we should take drop for 2021 Please sir

[@reviewer3771]

In the last question for sliding bw blocks F = 200 N not 280.

[@chandanbharti5207]

Thank sir

[@Pranil521]

sir according to me the answer of second part of fifth question should be 200N. And sir by the way your teaching is awesome..

[@priyanshgupta7459]

Sir is it always true that the force required to move the whole system is always less than the force to slide the 2 blocks??

[@rishabmishra6957]

yes, always

[@steyn4922]

sir can u take an example where the top block is connected to a spring

[@adityaroy-zg8xw]

Just F ki jgh speing force aayega

[@neet-tt1bj]

CORRECTION :- QUES 5 PAAR SIR JO FORCE F ,,, DONO BLOCKS KO SLIDE KAREGA USKA VALUE 200 N ATAH HEIN 280 NEHI

[@sumitdebnath4311]

Sir fluid mechanics ki tube vali problems par bhi ek video sir plzzzzzzz plzzz plzz🙏🏻🙏🏻🙏🏻❣️ A very humble request sir🙏🏻plzzz

[@physicsgalaxyworld]

coming up

[@Jin.oppas_left_hand]

Is there any playlist of this???

[@adityagautam3072]

thank you sir

[@sashanktricks1722]

Sir are these video lectures and ur book exercise enough to crack jee mains??

[@kunalrajput4421]

Q) = 40N and 200N

[@vaishnavis536]

Sir last qn part 2 ans 200N.If I am wrong please tell me how to do that

[@physicsgalaxyworld]

Thats right ! Good going !

[@krishankant5289]

wrong answer is 5th ka second part😀 Thank you sir ji😊🙏

[@meet-thetechtips1252]

Sir ,please keep one class for advanced level RC,LC ckts also

[@physicsgalaxyworld]

coming up

[@meet-thetechtips1252]

@@physicsgalaxyworld Thankyou sir ! My jee mains went very well now gearing up for advanced with your blessings!

[@shashwatkumar6248]

Sir i am jee mains student for 2021 can i use your jee advance illustration for my preperation , I have taken allen digital but they only teaches definition , plaease tell me what should i do please

[@movie_shorts_07]

Question 5 ( 40 ; 200 )

[@defier_52]

I've a doubt..... If stick one thing with other using a glue/fevicol, is it just increasing the friction? Or chemical changes occure at the sticking site? If ans is chemical changes, can we say that those chemical changes themselves create the friction?

[@parikshitsinghjadon5679]

Sir when hybrid physics classes will be continued?

[@pranjalrathoreiitkharagpur2201]

(()()(){DOUBT}()()() ..........................SIR IN FIRST EXAMPLE WHY DID WE HAVE NOT TAKEN .....COMMON ACCELERATION AS =(F-f2)/(m1+m2).... as you have told friction f2 will be acting on the block of mass m1....... ??? plese explain it

[@Lightyearfar]

Lower surface is smooth bro,and friction is internal force in that case

[@kingm2759]

SIR... SIRF 4 DIN BAAKI HE NEET KE liye.... Plz app kuch ese 10 min concept videos banado neet point of view se.... Plz sir... Plz sir.... Bas kuch videos banado ...ek baar important concepts revise ho jaega.... Plz sir.... 🙏🙏🙏🙏🙏🙏

[@abhiruprudra1889]

5. 40N, 200N

[@krishnavchoudhury5303]

Sir please make a video on projectile motion on an inclined plane ...

[@amanshukla1660]

Sirrr please strategy for 2021 droppers 🙏🙏🙏

[@devjyotisahani7896]

Sir Answer of 5 th question is wrong . According to me Correct answer will be 40 N and 200N.

[@sagnikmajumder1650]

In 5th problem...answer of the second case is 200N

[@mdtanweeralam850]

sir woukd you pls cover geometrical optics in in hybrid phy pls sir

[@leomessi-bm6if]

Sir..I think that the answer for the 5th q will be 40N and 200N

[@mannekumaraswamy]

sir please do video on 3 blocks system

[@kanswaskapoor165]

Sir please continue the series.🙏

[@prakharjain1228]

Chalo ab jakar samaz aaya..

[@lsuneeta7535]

Sir can u make video on errors and measurements please

[@anojskunte2227]

Sir where are the problems

[@aishwary959]

Sir pls upload these videos fast so that we can revise concept before jee advance 2020