Important concepts of Kinematics

2-1 Position, Displacement, and Distance

In describing an object's motion, we should first talk about position - where is the object? A position is a vector because it has both a magnitude and a direction: it is some distance from a zero point (the point we call the origin) in a particular direction. With one-dimensional motion, we can define a straight line along which the object moves. Let's call this the x-axis, and represent different locations on the x-axis using variables such as and , as in Figure 2.1