In classical mechanics, the Euler force is the fictitious tangential force[1] that appears when a non-uniformly rotating reference frame is used for analysis of motion and there is variation in the angular velocity of the reference frame's axes. The Euler acceleration (named for Leonhard Euler), also known as azimuthal acceleration[2] or transverse acceleration,[3] is that part of the absolute acceleration that is caused by the variation in the angular velocity of the reference frame.[4]
acceleration azimuthal Morin.