Take a stack of nine identical books and hold them horizontally by pressing them together with y...

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Take a stack of nine identical books and hold them horizontally by pressing them together with your hands (figure). Then decrease the pressure slowly until the books are just about to start falling down. Which book(s) will start to slide first? Assume that friction coefficient between books is greater than that
\( P \) between books and hands.

W.
Hold nine books horizontal between your hands.
Loosen the grip somewhat.
Which book(s) will tend to slide down first?
(A) 5
(B) 4,5 and 6 together
(C) \( 2,3,4,5,6,7,8 \) together
(D) all 9 books slide together
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