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| Rest and Motion |
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| Rest and motion are relative terms. A person sitting in a moving car is at rest with respect to his or her fellow passengers, but is in motion with respect to other objects or people on the road. Moreover, it is not possible to define 'absolute rest' or 'absolute motion'. Absolute rest is the complete absence of motion which is not possible to visualise because all the objects in this universe - electrons in an atom, molecules in solids or gases, solar systems in galaxies etc., are in motion. |
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| By the same logic, it is not possible to visualise 'absolute motion'. For us to define absolute motion, the motion must be described with respect to a reference point which is absolutely at rest, or absolutely fixed in space. Such a reference point does not exist, hence, it is not possible to define or imagine absolute motion. |
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