In Physics, we are interested in understanding the motion of objects. Motion represents an object’s continual change in position. Different types of motion exist: translational (movement from one point to another in a straight line), rotational (motion around an axis, e.g, an object spinning on its axis) and vibrational (repetitive and back and forth movement, e.g, a mass suspended by a spring). The motion in a straight line path is called kinematics. The simplest accelerated motion is straight line motion with constant acceleration. In this case the velocity changes at the same rate throughout the motion. This is a very special situation, yet one that occurs often in nature. Straight line motion with nearly constant acceleration also occurs in technology, such as a jet fighter being catapulted from the deck of an aircraft carrier.