4 ms·
Some frames of reference are very close to being inertial frames, and others aren't. There's a big difference between inertial and non-inertial frames. In non-i
by DiogenesKynikos 7y ago
Some frames of reference are very close to being inertial frames, and others aren't. There's a big difference between inertial and non-inertial frames. In non-inertial frames, you have to introduce fictitious forces in order for the physics to work out.
In short, the universe cares about acceleration, but not constant motion. Accelerating frames are different from non-accelerating frames.
- brighter2morrow 7y agoWe are accelerating away from the center of the universe though.
- DiogenesKynikos 7y agoThere is no center of the Universe. If the Universe is flat or negatively curved, then it is infinitely large, and if it is positively curved, then the volume is finite, but space is periodic. Space is intrinsically expanding, and that expansion is accelerating. That's quite different from acceleration in Newtonian physics. The statements I made about acceleration are in the context of Newtonian, pre-Relativistic physics, and are only approximate in a Relativistic framework.