Question

why is uniform circular motion called accelerated motion?

Answer 1

because the velocity changes as the direction is changing so the acceleration also occurs that's why it's called as accelerated motion.

Answer 2

Accelerating objects are objects which are changing their velocity - either the speed (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed. Nonetheless, it is accelerating due to its change in direction.