Chapter 4 Kinematics
Motions in a plane or a three-dimensional space require treating position, velocity, and acceleration as vector quantities. Each vector quantity would have a magnitude and a direction. The direction can be given by angles the vector makes with respect to axes.
In a plane, you need only one angle, which would often be with respect to the positive or negative \(x\) axis. In the three-dimensional space, the direction is often given by the angle coordinates of the spherical coordinate system. In this chapter, for simplicity, we mostly focus on motion in the \(xy\)-plane.