1. The sine and cosine functions are one-dimensional projections of uniform circular motion . 2. This can be seen as breaking part of the uniform circular motion rules. 3. Unlike tangential acceleration, centripetal acceleration is present in both uniform and non-uniform circular motion . 4. In non-uniform circular motion , normal force and weight may point in the same direction. 5. The angular rate of rotation ? is assumed independent of time ( uniform circular motion ). 6. As a generalization of the uniform circular motion case, suppose the angular rate of rotation is not constant. 7. There is no evidence that the celestial bodies moved in uniform circular motion , or along celestial spheres, in Babylonian astronomy. 8. Unlike those who came before him, he discarded the assumption that planets moved in uniform circular motion , replacing it with elliptical motion. 9. Because the uniform circular motion was considered to be " normal ", a deviation from this motion was considered an "'anomaly " '. 10. The figure at right shows a ball in uniform circular motion held to its path by a massless string tied to an immovable post.
