Overspin
I think force follow is the CB spinning forward like a car burning out on the tires, peeling rubber. If the CB does this and hits the OB first or the rail first, it's still "force-follow".
Here is a link to Mike Page's test for possible over spin.
http://www.sb8ball.com/Videos/Mobile/iv0033.html. The test shows it is almost impossible to actually get the ball to spin forward faster than it rolls. The tiny bit of over spin he is able to generate is almost not measurable and would wear off in one inch of forward travel as the ball reaches full forward roll. The idea that the cue ball "burns rubber" spinning forward is a widely believed concept and taught by many professional instructors. But scientifically it does not prove out. I questioned Dr. Dave about the actual forces that cause the cue ball to "want to" continue forward. Was it inertia? the idea that an object in motion tends to stay in motion?, etc. He did not directly answer me but referred me to his videos which demonstrate the ball is not over spinning but do not say:
1. If the ball stops turning forward at impact then resumes
2. Leaves the surface of the cloth so continues to spin in the air then resumes when it hits, etc.
I just found a slow motion video clip which explains it better.
http://billiards.colostate.edu/threads/follow.html#dribble
Overspin appears to happen when the weight of the cue ball is lifted from the cloth. So a tiny bit as Mike Page demonstrates on hit with the cue, then forward roll only until impact. At impact the ball lifts from the cloth and continues to spin in the air. Then when it lands it continues its forward roll. So as near as I can tell the friction with the cloth propels the cue ball forward at high speed, not slipping on the cloth, but when the cue ball collides its forward motion is stopped. The cue ball lifts (or climbs) enough to lose friction with the cloth and free spins in the air. When it re-connects with the cloth the friction propels it forward again.
That makes sense to me as I have often observed the cue ball bounce quite high then drop and spin forward, like on a break shot or a "high action" shot into a rail.