All of the work that we have done so far, with the exception of the case of circular motion, can be described in terms of linear motion – that is, motion along a fixed axis.  We are now about to extend our discussion of circular motion.

In particular, we will first define the angular quantities of interest – the quantities used to describe angular kinematics (or the description of angular motion). We will see how these quantities are related to the corresponding linear quantities. These relationships will then lead us to the set of four angular kinematic equations.  These four kinematic equations will be used in an exactly analogous way to the linear kinematic equations.

Finally, we will discuss the concept of center-of-gravity and torque, the angular version of force.