If you are referring to the Heim joint at the end of a tie rod with a bump steer kit installed the resistance required to pivot the bearing is of little consequence. They are usually a little stiff to move but what you want to check for is play. Make sure you can't move it up and down in the socket. Grab the wheel at 3 and 9 o'clock with the car jacked up and try to move it in and out. If you do not have any play or loose motion in it the bearing is okay.
My bad! You said lower control arm and I should have known you were talking rear. Same thing applies though, loose motion side to side or forward and backward would indicate a bad joint. A bearing that moves easily but has no loose motion is still good.
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