If the length of the velocity vector (speed) is constant, it is still possible that the direction of the velocity vector changes with time, and thus, that the acceleration vector is non-zero. where \(...If the length of the velocity vector (speed) is constant, it is still possible that the direction of the velocity vector changes with time, and thus, that the acceleration vector is non-zero. where →a∥(t) is the component of the acceleration that is parallel to the velocity vector, and is responsible for changing its magnitude, and →a⊥(t), is the component that is perpendicular to the velocity vector and is responsible for changing the direction of the motion.
