1. The problem statement, all variables and given/known data Given that: theta_dot = 6 rad/sec m_A = 0.8kg u_k = 0.40 The problem also mentions that movement is at a constant angular rate so I think that means: r_doubleDot = 0 theta_doubleDot = 0 Lastly, at an instant: r_dot = 800mm/sec = 0.8m/sec 2. Relevant equations (wrote these out in word) 3. The attempt at a solution So I think I have to use polar coordinates for this question... - In polar coordinates I think the only force acting in F_r is the friction force (towards the bar) - In the F_theta direction i think the only force acting is the force moving the rod (I called it F_push) from equation 2 and 3 I have: (4) and from equations 1 and 3 I have: (5) This is as far as I have gotten with the problem. The issue is that I'm not sure if I have my force equation set up correctly or if i'm missing some piece of information because I don't know how I would find r (polar coordinates confuse me a lot) Just as a side note, I know that the final answer is supposed to be 4.39N. Any help would be greatly appreciated!