Introduction to Circular Motion
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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. |
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The radius vector.
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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