Question

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 horizontal. The book weighs $31 \mathrm{~N}$. The coefficient of static friction between his hands and the book is $0.40$. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

          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 horizontal. The book weighs $31 \mathrm{~N}$. The coefficient of static friction between his hands and the book is $0.40$. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
        
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University Physics with Modern Physics
University Physics with Modern Physics
Hugh D. Young 14th Edition
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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 horizontal. The book weighs $31 \mathrm{~N}$. The coefficient of static friction between his hands and the book is $0.40$. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
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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 horizontal. The book weighs 31 N. The coefficient of static friction between his hands and the book is 0.40. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

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ssm 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 horizontal. The book weighs 31 $\mathrm{N}$ . The coefficient of static friction between his hands and the book is $0.40 .$ To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

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ssm-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-horizontal-the-book-w-2

ssm 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 horizontal. The book weighs 31 $\mathrm{N}$ . The coefficient of static friction between his hands and the book is $0.40 .$ To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

Hubert A.


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Transcript

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0:00 Hello.
00:03 So we have a book.
00:10 It's weight, m .g.
00:16 The pressing force is our normal reaction r, and it gives rise to friction that opposes the intended motion of the book.
00:26 Because the book would want to fall downwards.
00:28 Friction u .r is opposing it...
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