The direction is always perpendicular to the direction of motion, and the direction changes from time to time and points to the center of the circle. No matter whether the speeda magnitude is changed or not, the direction a changes from time to time, so the circular motion must be a variable acceleration motion. It can be understood that the speed of the object moving in a circle increases in the direction of the center of the circle.

Centripetal acceleration Calculator

Centripetal acceleration：a=v² / r

r = radius

v = speed