Velocity of Sliding Between Two Mating Gear Surfaces Can Be

Multiple Choice

Velocity of sliding between two mating gear surfaces can be defined as

A) Sum of their angular velocities x distance between pitch point and point of contact.
B) Sum of their angular velocities x distance between their centres of rotation.
C) Sum of their angular velocities x difference between their pitch circle diameters
D) None of these
E) None of the above