A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are hortizontal. The book weighs 31 N. The coefficients of static friction between hishands and the book is .40. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert.

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funblogC · Accepted Answer

The frictional force on both sides of the book are equal to μsN  So the weight of the book must be equal to thesum of these forces.  31=2μsN  then solve for normal force  N=312μs  N=312(0.40)=38.75 N≈39 N

A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendic

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