## Abstract

Two-dimensional angular motions of bodies are commonly described in terms of a pair of parameters, r and *θ* (theta), which are called the *polar coordinates*. Polar coordinates are particularly well suited for analyzing motions restricted to circular paths. As illustrated in Figure 13.1, let O and P be two points on a twodimensional surface. The location of P with respect to O can be specified in many different ways. For example, in terms of rectangular coordinates, P is a point with coordinates *x* and y. Point P is also located at a distance *r* from point O making an angle *θ* with the horizontal. Both *x* and y, and *r* and *θ* specify the position of P with respect to O uniquely, and O forms the origin of both the rectangular and polar coordinate systems. Note that these pairs of coordinates are not mutually independent.

### Keywords

Torque Sine Tate Dinate Dian## Preview

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