vc : speed of the carFor those who want to reproduce the table, just use following formula.
vbc : tip speed of bottom wheels relative to the car
vtc : tip speed of bright wheel relative to the car
vt : tip speed of bright wheel touching top conveyor
dvt : speed difference between highest point of bright wheel and top conveyor
vbc = vc - v1
vtc = vbc / ratio
vt = vtc + vc
dvt = vt - v2
Here is an interesting thing. With ratio=-1, dvt is constant. No matter how fast the car is running, it will always feel a push to the right by top conveyor.