Homework Help: physics

Posted by brian on Thursday, January 27, 2011 at 6:25pm.

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 30.0 N. The coefficient of static friction between his hands and the book is 0.435. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?

physics - drwls, Thursday, January 27, 2011 at 8:43pm
Each hand applies a maximum friction force
(0.435 F),
where F is the pressing force

Twice that force must equal or exceed the weight, M g

0.87 F > M g

Fmin = M*g/0.87 newtons

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