Average velocity, $v_{avg}$, is calculated by dividing the change in position, $\Delta x$, by the change in time, $\Delta t$: $v_{avg} = \frac{\Delta x}{\Delta t}$.

Average acceleration, $a_{avg}$, is calculated by dividing the change in velocity, $\Delta v$, by the change in time, $\Delta t$: $a_{avg} = \frac{\Delta v}{\Delta t}$.

Centripetal acceleration, $a_c$, is calculated by dividing the square of the velocity, $v^2$, by the radius, $r$: $a_c = \frac{v^2}{r}$.

Centripetal force, $F_c$, is calculated by multiplying the mass, $m$, by the centripetal acceleration, $a_c$: $F_c = m a_c = \frac{mv^2}{r}$.

Where an object is located.

The change in position; a vector quantity.

The rate of change of position; a vector quantity.

The rate of change of velocity; a vector quantity.

Acceleration directed towards the center of a circular path.

The net force causing centripetal acceleration, directed towards the center of the circle.

The average position of all the mass in a system.

It causes centripetal acceleration, resulting in uniform circular motion.

The centripetal acceleration decreases.

The center of mass accelerates as if all the mass is concentrated there and all external forces act on that point.

The centripetal acceleration increases.