Hey, I'm trying to create a mechanism consisting of multiple rollers connected with belt, moving in the same linear direction with acceleration a, but I got stuck in finding the relationship between the forces and acceleration. I even got confused in building the FBD of only two rollers. The picture below is the FBD of two rollers connected with a belt that I made. As can be seen the equation is quite inconsistent. Can anyone tell me what's wrong?
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