# Why do the the Normal force of rope on to pulley is not considered while analyzing the free body diagram of Pulley? Suppose in extensible mass less rope is placed on a pulley surface, obviously there will be a normal force pairs between the Pulley and rope. right? Why do the the Normal force of rope on to pulley($$N_{pulley,rope}$$) is not considered while analyzing the free body diagram of Pulley? I am adding the picture where I was confused, Fig I shows the free body diagram of Pulley A. • What are you solving for? – Danny LeBeau Jul 19 '20 at 7:52
• I am trying to find out all the forces on the pulley. – Unknown x Jul 19 '20 at 7:57
• Can I add the picture in my question, where I was confused? – Unknown x Jul 19 '20 at 7:58
• Yes please do that. – Danny LeBeau Jul 19 '20 at 8:01
• The pulley and rope are considered to be perfect. That is there is no friction between the contact points of the pulley and rope . The rope is massless so it cannot have any weight of its own . This might seem weird at first but thats how an introduction is given in NLM. Once the basic concept is understood , you will find problems where you have to consider the mass of the rope – Jdeep Jul 19 '20 at 8:21

• Thank you. Now,this lead me one more question. Why $T_1$ is directed upward in the figure 1? – Unknown x Jul 19 '20 at 8:37