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

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.
In this video Ashish Sir has analyzed all the quiz discussion questions given for students (listed below) and explained in detail about how to approach solutions to such questions. Basic theory with illustration is explained in the PIM video of block over block friction cases which can be accessed through the link - • Block over Block Frict...
For quick revision of friction for JEE & NEET, students can watch Physics Galaxy revision checklist video available at link - • Friction | Revision Ch...
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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]
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