It is proportional to the normal force and independent of the area of contact.
This can be described by Amontons' law, and it is related to viscosity and velocity by the Stribeck curve. It can be measured by a tribometer. For the dry form, a relation discovered by Coulomb can be used. The coefficients of this phenomena can be either for the (*) kinetic or static cases. It is proportional to the normal force and independent of the area of contact. For 10 points, name this resistive process between moving items that are in physical contact.
This can be described by Amontons' law, and it is related to viscosity and velocity by the Stribeck curve.
friction