Introduction to Circular Motion, Radius Vector

The Radius Vector

The radius for circular motion is a vector. It is shown at the left drawn in red. This radius vector locates the orbiting object. One should imagine an x, y coordinate system with its origin at the center of the circle. The radius extends from this origin to the position of the object.

Notice that the radius vector is not constant. It does have a constant size; however, its direction changes as the object orbits.

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