The Cause of rolling friction is the irregularity and lack of symmetry of the surfaces between which it occurs.
The coefficient of rolling friction of a railroad train on a track is 0.009.
In a knife edge support, seen in some forms of pendulums, is exhibited a form of rolling friction.
That is to say, by converting the rolling friction into the rubbing friction.
rolling friction is frequently substituted for sliding friction by the use of ball and roller bearings.