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eric_marsh
2007-Jul-07, 03:29 AM
Can someone explain inertial frames to me? How did the idea come about and how is it tested?

Octagon
2007-Jul-07, 04:01 AM
Sorry, can't help. My browser doesn't support inertial frames.

hhEb09'1
2007-Jul-09, 05:09 AM
A frame is a frame of reference, a way of coordinatizing space and time. One common frame is the lat/lon grid that rotates and revolves with the earth--no matter where the earth is in its orbit, a city stays at the same latitude and longitude. That would be an example of a non-inertial frame.

An inertial frame is one in which the laws of Newton are valid. They are not valid in the lat/lon grid (or other non-inertial reference frames) because "fictitious" forces like coriolis and centrifugal arise.

eric_marsh
2007-Jul-12, 01:14 PM
What interests me is the subject of time dilation and how inertial frames come into play. (This might be a topic worth touching on in a podcast.) For example, we have two people at rest and then person B accelerates away from person A. Seems to me that from each of their perspectives the other should be running in slow motion time. Correct? At some point person B stops and accelerates back towards person A. My understanding is that A will be much older than B, but why? If there is no absolute reference then from B could consider himself to be stationary and from his perspective A may be moving away from him.

I know that there are reasons for the accepted conclusions but I don't have a good handle on them.

hhEb09'1
2007-Jul-12, 08:42 PM
Try these: