A ladder leans against a smooth wall, as can be seen in Fig. 5-11. (By a smooth

Question:

A ladder leans against a smooth wall, as can be seen in Fig. 5-11. (By a “smooth” wall, we mean that the wall exerts on the ladder only a force that is perpendicular to the wall. There is no friction force.) The ladder weighs 200 N, and its center of gravity is 0.40L from the base, where L is the ladder’s length.

(a) How large a friction force must exist at the base of the ladder if it is not to slip?

(b) What is the necessary coefficient of static friction? Fe FN1 50 0.40L% 200 N Fig. 5-11 50 709'0 FN2