Final answer:
Eccentric cams offer non-uniform motion, whereas circular cams provide uniform circular motion, each utilizing radius of curvature and rotation angle in their functioning.
Step-by-step explanation:
An eccentric cam is a type of cam in which the center of rotation of the wheel is not at the geometric center, causing the shaft to move in a non-uniform circular motion when rotated. This contrasts with a circular cam, where the center of rotation and the geometric center are the same, resulting in uniform circular motion. Eccentric cams are often applied to the system where varied or controlled motion is needed rather than continuous circular motion. The motion of cams is often analysed considering things like the radius of curvature, which is the radius of a circular path, and the rotation angle, which relates to the movement dictated by the cam profile.