CBSE Class 11-science Answered
Solve:
![question image](https://images.topperlearning.com/topper/new-ate/22154904882042420181022115427.jpg)
Asked by Anish | 22 Oct, 2018, 11:56: AM
![](https://images.topperlearning.com/topper/tinymce/imagemanager/files/c9371399b12307aa4811bee01594abe65bce981acf6db7.99211726oct2201.png)
Free body diagram of all the blocks are given in figure. For block-A the limiting friction is μN = 0.3×300 = 90N
For block-B the limiting friction is μN = 0.2×400 = 80N, For block-C the limiting friction is μN = 0.1×600 = 60N
Let the applied force on block-A acting on left side is 60N.
Since this is less than limiting friction, static friction fAB between block-A and block-B is 60 N.
Reaction force
is acting on block-B towards left which is due to static friction force of block-A.
![begin mathsize 12px style f space apostrophe subscript A B end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/d351a4dd9b9b174287fcb99ca3a43368.png)
This reaction force
is equal to 60N.
![begin mathsize 12px style f space apostrophe subscript A B end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/d351a4dd9b9b174287fcb99ca3a43368.png)
Since this reaction force
is less than limiting friction, static friction fBC acting between block-B and block-C is 60 N
![begin mathsize 12px style f space apostrophe subscript A B end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/d351a4dd9b9b174287fcb99ca3a43368.png)
Reaction force
is acting on block-C towards left which is due to static friction force of block-B.
![begin mathsize 12px style f space apostrophe subscript B C end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/d00cb44a5a4c31faba324e46b059d770.png)
This reaction force
is equal to 60N.
![begin mathsize 12px style f space apostrophe subscript B C end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/d00cb44a5a4c31faba324e46b059d770.png)
Since this reaction force
is now equal to limiting friction fCG , block-C will start move
![begin mathsize 12px style f space apostrophe subscript B C end subscript end style](https://images.topperlearning.com/topper/tinymce/cache/d00cb44a5a4c31faba324e46b059d770.png)
Block-A and block-B will not move for the applied force 60N on block-A,
because for both blocks, the force acting towards left is less than limiting friction.
Conclusion :- if 60N force is applied on block-A towards left, only block-C start moving,
Answered by Thiyagarajan K | 23 Oct, 2018, 09:14: AM
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