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| | Newton’s Second Law – Inertial Mass |
 | | For example, if the speed of light is the same in all inertial frames, then light must propagate without a medium; otherwise the medium would affect the speed of light as viewed from different inertial frames. |
 | | inertial frame, imagine we have an infinite number of observers, each located at a specific point in the inertial frame with a clock. |
 | | Examples of events are birth, death, explosions, detectors going off, etc. In other words, if you are born in one inertial frame, you are also born in any other inertial frame – the time and location of your birth may be different in different frames, but the fact of your birth is absolute. |
| www-personal.umich.edu /~pberman/20relpost.html (777 words) |
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