In physics, we are interested in understanding the motion of objects. Motion represents an object’s continual change in position.
What is motion?
With respect to time, motion is described as the change in the position of an object from its initial position to its final position. It can be described by looking at the physical parameters. Types of motions are
Translational – Movement from one point to another in a straight line
Rotational – Motion around an axis, e.g, an object spinning on its axis
Vibrational – Repetitive and back and forth movement, e.g, a mass suspended by a spring
Motion in a straight line
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 often occurs 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.