A student presses a book between his hands (book is verticle).The forces that he exerts on the front and back covers of the bookare perpendicular to the book and are horizontal. The book weights31N. The coeffi coefficient of static friction between the handsand the book is 0.40. To keep the book from falling, what is themagnitude of the minimum pressing force that each hand mustexert?

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A student holds a physics book in her hands motionless 1.2 meterabove the floor as shown to the left. The forces from her hands onthe front and the back of the book are perpendicular to the book'scover and are horizontal. The mass of the book is 30 kg. Thecoefficient of static friction betweent the covers and her hands isÂµs=0.49 and the coefficient of kinetic friction is Âµk=0.3.
c) What is minimum normal force that the student can apply fromeach hand to the cover of the book to keep it from slipping throughher hands?

A) A siring is tied to a book and pulled lightly as shown at right. The book remains in contact with the table and does not move. Draw a free-body diagram for the book. Label each of the forces exerted on the book as you were instructed in the tutorial Forces.

B) How do the forces exerted on the book, in this case, compare to the forces exerted on the book when the string is not present? List any forces that are the same (i.e., same type of force, same direction, and same magnitude) in both cases. Make a separate list of forces that change (or are not present) when the string is pulled.

C) Consider the following statement made by a student about a book at rest on a level table: "The two forces exerted on the book are the normal force directed up and the weight of the book directed down. These are equal and opposite to one another. By Newtons third law they are (action-reaction) force pair, so the normal force is always equal to the weight of the book." Do you agree with the student? Explain why you agree or disagree.

D) Consider a book on top of a level table while the book is being pressed straight down by a hand. In the space below, draw a free-body diagram for the book. Label the forces as you did in the tutorial Forces. How do the forces exerted on the book in this case compare to the forces exerted on the book when the hand is not pushing? List any forces that are the same (i.e., same type of force, same direction, and same magnitude) in both cases. Make a separate list of forces that change (or are not present) when the hand is pressing down on the book.

E) When the hand is pushing down on the book, is the magnitude of the weight equal to the magnitude of the normal force exerted by the table on the book? How can you tell?

byzantiumwhale17

A tired and overloaded student is attempting to hold a largephysics textbook wedged under his arm. The textbook has a mass of3.0 kg, while the coefficient of static friction of the textbookagainst the student's underarm is 0.320 and the coefficient ofstatic friction of the book against the student's shirt is0.160.
(a) What is the minimum horizontal force that the student mustapply to the textbook to prevent it from falling?
(b) If the student can only exert a force of 65.3 N, what is theacceleration of the textbook as it slides from under his arm? Thecoefficient of kinetic friction of arm against textbook is 0.200,while that of shirt against textbook is 0.090.
What is the magnitude?
What is the direction?

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