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cianfa72
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- TL;DR Summary
- understanding how rotation or acceleration of an object can be defined without any relationship between the object itself and something else
Starting from this post, we are able to define the concept of (proper) acceleration or rotation without any reference to something else
About this definition which is the physical meaning of gyroscopes axes pointing in three mutually orthogonal spacelike directions ?
In other words, from a physical point of view, how can we select those three mutually orthogonal spacelike directions ?
Thanks
PeterDonis said:It's defined in terms of accelerometers and gyroscopes. Basically, you set up three gyroscopes whose axes point in three mutually orthogonal spacelike directions. Then you set up accelerometers to measure acceleration in each of those three directions. Then you carry along this apparatus next to the object, so that you can watch the readings of the accelerometers and the relationship between the spatial orientation of the object and the axes of the gyroscopes. Nonzero accelerometer readings means "acceleration"; change in the orientation of the object relative to the gyroscopes means "rotation".
About this definition which is the physical meaning of gyroscopes axes pointing in three mutually orthogonal spacelike directions ?
In other words, from a physical point of view, how can we select those three mutually orthogonal spacelike directions ?
Thanks