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Beacuse Motion corresponds to d velocity and d change of position is very rare.Ecah and every body created in the universe has an effect on the other bodies in the universe. eg:rotation and revolution of earth

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Motion, uniform in both velocity and path (change of position), is uncommon, for each body is affected by the other bodies in the universe. The rotation of the Earth round the Sun is affected by the closeness of the other planets. Though the eccentricity of Earth's Solar orbit is very close to a perfect circle. 
And in mechanical objects such as motors, the effects of friction and gyroscopic effects are non-zero.

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