Discussion of Block over Block Friction Quiz for JEE & NEET | #PhysicsGalaxyPIM

In JEE & NEET, both exams the topic of friction between block over block problems is very important and it forms the basic understanding of cases of friction in mechanics. In PIM video Ashish Arora sir has explained all the concepts for cases of a block over another block is placed and one of the block is pulled by an external force.

Detailed understanding of the concept can be covered through the Physics Galaxy Concept videos available through our channel playlist or our website.

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To understand all the applications of friction and dynamics, students can refer our Physics Galaxy series of books. These books are available for purchase at below link -

Practice Quiz Questions solved and analyzed in this video -
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]

#physicsinminutes #physicsgalaxy #jeeadvanced

[physicsgalaxyworld]

For any views, queries & suggestions about upcoming videos, students can reply to this comment.
PG Team wishes all students BEST for their bright future !

[AMAR-pcht]

👑⛑👒🎩Hats off to ur dedication sir!!! 🙏🙏🙏🤜

[prabirkumartiwary]

I always wait from 12:15 and the video came.
Thank you sir for this video on Diwali day.
Wishing you and your team a happy and prosperous Diwali.

[anmoltripathiiitkgp]

Very very happy diwali to PG and team !...
Keep on cracking,
Keep on booming the concepts,
Thank you!❤️🙏

[vikky]

Sir please also take case when three blocks are over each other ...

[ikshu]

Sir what should be the method to solve Physics numericals....should I first solve examples myself or should I first read the examples and then go for the exercise..
Happy Diwali Sir May this diwali God keeps you and your Family Safe and Healthy

[studyzone]

Sir apke concept bahut easy to understand h...mene kayi jagah try kiya h but isse accha kahin nhi smjh aaya

[xplainedindetail]

Sir please video on "how to revision jee mains syllabus" and also physics in minutes video for jee mains.
Please make a video sir

[tusharkumar]

Thank you ashish sir and the whole PG team for doing this fabulous work even on the day of holiday....Happy Diwali Sir and the whole PG team..🙏

[Yashan]

Ashish Arora sir, I am one of your big fan from sri lanka...I am a sinhalese..please make the english subtitles of your videos

[m.srivani]

Sir pls say how you got this much knowledge..
And your teaching style is very nice...
Understanding concepts very easier...
ENTIRE PG TEAM MEMBERS ARE VERY LUCKY TO HAVE THIS SIR LIKE THIS

[arpitshukla]

I've never seen such type of Wordless

[foodieskitchen]

Sir thank you so much, my all doubts are cleared in this video.

[lifelines]

Sir happy diwali and I feel very happy as I learned my physics from you and your colleague as my physics teacher also follows you .you are very good mentor sir .

[sailakshman]

Sir, I am JEE 2021 aspirant. I am doing hardwork as per my level best.
please Bless me sir.

[yatinsharma]

May this diwali bring universal compassion, the inner joy of peace and the love and the awareness of oneness to all
Happy diwali to u and ur family sir !!!

[SamudraFlavorsYT]

sir, you are doing gods work
thankyou

[pratyush]

Best teacher ❤️😍😍😍😍❤️
Best guider for

[prabirkumartiwary]

I remembered in this, only the last question I was not able to solve.

[bullymaguire]

Happy Diwali Sir to you Poggie and entire PG team.