Place the cursor at any point on the path and click the mouse button to see the total acceleration, the tangential acceleration and the radial (centripetal) acceleration. The maximum number of points you may mark is 10. The Reset button clears marked points. The magnitude of the radial component of the total acceleration, shown in green, we know is |v|² / r. The magnitude of the tangential component of the total acceleration, shown in blue is the rate of change of the speed of the particle, |v| / t.