Friction Coefficient - “Static” and “Dynamic”
There are two Friction Coefficients: the Static and the Dynamic.
If the Parts at the joint do not move relative to each other, we use the Static Friction Coefficient
If the Parts at the joint are moving we use the Dynamic Friction Coefficient (labeled “Friction-Coefficient” in dialog above)
Damping Velocity Coefficient
If the Parts at the joint are moving relative to each other, we add to the Friction Coefficeint the resistance due to Damping at the joint.
Friction Diameter
When the joint is a Pin-Joint, you should enter the PCD of the rolling elements in the bearing, or the diameter at the interface of a bush.
From the Friction Coefficient, the Friction Diameter and the Magnitude of the Force at the joint, we can calculate the Torque resisting the rotation of the Joint.