Friction in rbd

Friction in rbd

by Manoj Kumar -
Number of replies: 2
Picture of ONLINE COURSE-2021

why friction is not considered in fbd of pulley while it produce torque in one direction as it has tendency to rotate as you have drawn the figure showing friction in figure 

Please elaborate this 

In reply to Manoj Kumar

Re: Friction in rbd

by vishal deoarshi -
Picture of LIVE COURSE
if you draw free body diagram of pully only without string then we have to show friction, but if you draw fbd of string + pulley as a system then you cannot show friction as it act on string also in opposite direction. Moreover , fR=(T2-T1)R. static friction is the cause of difference in tension