nothing is in the state of absolute rest or motion justify
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It's highly analogous to laying out Cartesian axes in ordinary 2D (or 3D) space. All you need to get started is a measure of length. From that you can derive a concept of straightness (a straight line is the shortest distance between two points) and a concept of at right angles (from constructing a cross-line that makes two identical triangles). You don’t need to identify the One True X axis, which is just as well because there’s no One True X Axis or One True X Direction built into the Euclidean plane. Rather you can pick any straight line and anoint it the x axis.
In the same way, relativity starts with a measure of distance. Clocks aren’t lousy measures of the One True Time Coordinate - rather they’re spacetime odometers which measure a distance-like quantity called spacetime interval along their path through history. But it’s a bizarro version of distance in that what we’ll get around to defining as the time coordinate contributes oppositely to the space coordinates. So it turns out that what’s analogous to a straight line is the longest path (i.e., path of longest elapsed clock time) between two events. And that’s what inertial trajectories are! So the Twin Paradox is actually a fundamental principle - the Earth Twin, who moves inertially, has the longest elapsed time because that’s what inertial motion is. And this is the jumping off point to GR - in curved spacetime near gravitating masses, inertial trajectories are no longer straight lines at constant speed per Newton’s First Law, but the traditional circular, elliptical, etc paths.
Similarly, the analogy to at right angles turns out to be Einstein synchonization. And you can implement all this without either the One True Time Axis or the One True X/Y/Z Axes being engraved into history waiting to be uncovered - all you need is an inertially moving reference object.
In the same way, relativity starts with a measure of distance. Clocks aren’t lousy measures of the One True Time Coordinate - rather they’re spacetime odometers which measure a distance-like quantity called spacetime interval along their path through history. But it’s a bizarro version of distance in that what we’ll get around to defining as the time coordinate contributes oppositely to the space coordinates. So it turns out that what’s analogous to a straight line is the longest path (i.e., path of longest elapsed clock time) between two events. And that’s what inertial trajectories are! So the Twin Paradox is actually a fundamental principle - the Earth Twin, who moves inertially, has the longest elapsed time because that’s what inertial motion is. And this is the jumping off point to GR - in curved spacetime near gravitating masses, inertial trajectories are no longer straight lines at constant speed per Newton’s First Law, but the traditional circular, elliptical, etc paths.
Similarly, the analogy to at right angles turns out to be Einstein synchonization. And you can implement all this without either the One True Time Axis or the One True X/Y/Z Axes being engraved into history waiting to be uncovered - all you need is an inertially moving reference object.
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If you compare the motion of a bus moving with respect to a man standing,then the bus is in motion with respect to the man.
But if you compare it's motion with that of the passengers sitting inside, you will notice that the passengers are in rest with respect to the bus.
Then you must be wondering that why I am explaining the rest and motion.
The actual answer is that nothing or nobody is in a state of rest in this entire universe.
it is because the earth is moving and we are on the earth and the whole universe itself is moving.So all of us are in a state of motion with respect to something or the other.
HOPE THIS ANSWER WILL BE HELPFUL TO YOU.GOOD LUCK!
AND DON'T FORGET TO MARK IT THE BRAINLIEST.
But if you compare it's motion with that of the passengers sitting inside, you will notice that the passengers are in rest with respect to the bus.
Then you must be wondering that why I am explaining the rest and motion.
The actual answer is that nothing or nobody is in a state of rest in this entire universe.
it is because the earth is moving and we are on the earth and the whole universe itself is moving.So all of us are in a state of motion with respect to something or the other.
HOPE THIS ANSWER WILL BE HELPFUL TO YOU.GOOD LUCK!
AND DON'T FORGET TO MARK IT THE BRAINLIEST.
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