Question: note for part c 5815 n is not the answer...

NOTE: For Part C) 58.15 N is NOT the answer ; For Part D) 102.27 and -102.27 is NOT the answer.

Part C) What is the force of friction on the book if P = 210N? Specify the direction of the friction force as positive up, negative down.
(include units with answer)

Hint(s) for Part C: #1: Static equilibrium #2: Think about the two force values from parts A and B - that should help you visualize the direction of the friction force.

Part D) What is it maximum force P that can be applied before the book slips?
(include units with answer)