Block over Block Friction (Part-2) for JEE(Adv) | Class 11 Physics in Minutes|
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- Опубликовано: 7 сен 2020
- In JEE Advanced topic of friction between block over block problems is very important and it forms the basic understanding in dynamics. Ashish Arora sir has explained all the concepts related to application of friction when a block over another block is placed and lower block is pulled by an external force. The concepts Analyzed in this video are given below.
Concept-1 : Block over block on smooth surface with external force on lower block
Concept-2 : Understanding and condition of common Motion of block with force on lower block
Concept-3 : Block over block on smooth surface with external force on upper block
Concept-4 : Limiting condition of common motion of blocks with force on upper block
Concept-5 : Block over block on rough surface with force on upper block
Concept-6 : Case analysis when upper limiting friction is smaller than lower limiting friction
Concept-7 : Case analysis when upper limiting friction is larger than lower limiting friction
Concept-8 : Understanding of case when lower block never slides
Concept-9 : Understanding of case when upper block never slides (when middle surface is smooth)
Concept-10 : Sliding condition in every case - friction at surface becomes equal to limiting friction
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 -
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Based on above video some questions are given below in comment section which students can solve and check if they are able to solve these questions using the concept explained in above video. Out of 5 questions given below for third question answers are not given. Students are advised to post the answer of this question in comments to discuss and verify if their answer is correct.
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.
Practice Quiz Questions -
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]
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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.
please stop making poji work .its child labour. let him study
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.
Sir you are a GOD 🧚🧚 for students from rural areas . Thank you sir🙏🙏🙏🙏
Sir please make a playlist of this series
those who have disliked has kept their mobile in opposite direction such that it seems to them like
No wrong answer.
CORRECTION :- QUES 5 PAAR SIR JO FORCE F ,,, DONO BLOCKS KO SLIDE KAREGA USKA VALUE 200 N ATAH HEIN 280 NEHI
Sir we are waiting for jee advanced 2020 tips...😔😔
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
Just when you think a man cannot be any greater, Ashish Sir pushes the limit further.
Sir this physics in minutes series is awesome sir ❤️❤️
Thank you so much sir . You have cleared every concept.
Sir now I understood clearly thanks ,and I was able to do all questions.
Tq sir for a wonderful session really I have cleared all the questions in the comment section . Thank you
Physics galaxy is a life saver... really a legendary channel. 🔥🔥 thnx team PG
Sir you made me fall love with physics
Sir, thank you so much it helps so much in revision
A lot of thanks sir..u are great 🙏🙏🙏🙏🙏