You and three friends stand at the corners of a square whose sides are 8.0 m long in the middle of the gym floor, as shown in Fig. 7.27. You take your physics book and push it from one person to the other. The book has a mass of 1.0 kg, and the coefficient of kinetic friction between the book and the floor is µk = 0.26. (a) The book slides from you to Beth and then from Beth to Carlos, along the lines connecting these people. What is the work done by friction during this displacement? 1 J(b) You slide the book from you to Carlos along the diagonal of the square. What is the work done by friction during this displacement? 2 J(c) You slide the book to Kim, who then slides it back to you. What is the total work done by friction during this motion of the book? 3 J(d) Is the friction force on the book conservative or nonconservative?4The friction force is a conservative force. .
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