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# Force of friction and pulling apart two books.

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Two identical books each with k pages are placed on the table in a way that the each page of book A is between the pages of book b. The high half of book B is on top of book A.

Given that 1) the coefficient of static friction on the surface of card A is mu; 2) Each page of the book has a mass of m; 3) Book A does not move from the table. What is the minimum amount of horizontal force applied to book B in order to pull it out of book A?

https://brainmass.com/physics/applied-physics/force-friction-pulling-apart-two-books-31791

#### Solution Preview

book B book A
-------------- 1st page, M1=m=(2*1-1)*m
-----------------
--------------- 2nd page, M2=3m=(2*2-1)*m
...

#### Solution Summary

This solution includes an explanation and calculations. To pull book B from book A, we have to overcome the static force which is equal to fn*mu. 120 words.

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