This explains the preference for uniform motion in transportation. Acceleration As soon as forces that do not cancel each other out act on an object, uniform motion no longer takes place. A simple idea of the concept of acceleration can be obtained when the change in velocity occurs only in the direction of the velocity itself. The force responsible for the acceleration is provided by the motor, and the occupant undergoes the same accelerating force by being pressed into the seat. Unless an occupant is secured by a seat belt, there is no decelerating force on him or her, and he or she persists in the forward motion.
Acceleration is also a vector.
If the force causing the acceleration does not act in the same line as the velocity, the acceleration may be divided into two perpendicular components. The component in the direction of the velocity is called the tangential acceleration. The average tangential acceleration is equal to the change in velocity per unit of time. The component of acceleration perpendicular to the velocity is the radial acceleration. Even if an object is undergoing uniform motion, its path will become curved under the influence of radial acceleration.