- #176
JesseM
Science Advisor
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Yeah, and more generally the time dilation equation relating clock rate to speed only works in inertial frames, and it can be taken as part of the definition of an inertial frame that any object with a constant position coordinate (one which is "at rest" in that frame) should show zero reading on an accelerometer (not experiencing any G-forces).DaleSpam said:Hi LightNg, welcome to PF,
It does break the symmetry since an accelerometer aboard one ship will detect the acceleration and an accelerometer aboard the other ship will not. That is asymmetric. This highlights the difference between coordinate acceleration (which is symmetric) and proper acceleration (which is asymmetric).