Optional (10 points, extra credit) A dictionary of mass M= 5 Kg is pushed against a vertical wall with a horizontal force of magnitude F= 200 N, so that it does not slip down the wall, as shown in the figure. The coefficient of static friction for the dictionary in contact with the wall is μs = 0.3. 1A (2.5 points) Draw the free body diagram for the dictionary. 1B (2.5 points) Determine the magnitude of the normal force acting on the dictionary. 1C (2.5 points) Find the magnitude of the static friction force acting on the dictionary. 1D (2.5 points) If the magnitude of the force F decreases until the book is ready to slip, what is the magnitude of F when slipping is imminent? F

Optional (10 points, extra credit) A dictionary of mass M= 5 Kg is pushed against a vertical wall with a horizontal force of magnitude F= 200 N, so that it does not slip down the wall, as shown in the figure. The coefficient of static friction for the dictionary in contact with the wall is μs = 0.3. 1A (2.5 points) Draw the free body diagram for the dictionary. 1B (2.5 points) Determine the magnitude of the normal force acting on the dictionary. 1C (2.5 points) Find the magnitude of the static friction force acting on the dictionary. 1D (2.5 points) If the magnitude of the force F decreases until the book is ready to slip, what is the magnitude of F when slipping is imminent? F