Final answer:
The term for a change in the speed of an object in circular motion is 'tangential acceleration', which occurs alongside constant centripetal acceleration in non-uniform circular motion.
Step-by-step explanation:
The term that describes a change in the speed of an object in a circular motion is tangential acceleration. Uniform circular motion refers to the motion of an object traveling in a circular path at a constant speed. In this type of motion,
despite the speed being constant, there is always a centripetal acceleration because the direction of the object's velocity is continually changing.
If the object in circular motion is also changing its speed, then in addition to centripetal acceleration, the object also experiences tangential acceleration, which relates to the changes in the magnitude of velocity.