The length of the relativistic theory of relativity, why does the length of the outside world become

In this way, when an object is in motion, the measured time and space will change on this object.

The shortening of length is only one aspect of spatial change--- it is not only the length that becomes shorter, but also the time, width, and height.

As for why this is so, it can only be explained that this is the physical rule of this universe.

According to the theory of relativity, the only constant absolute value in the universe is the speed of light. The measured speed of light is the same in an object moving at any position, at any speed, in any direction.

<> Xiangtong Pei's theory of length change has not changed. In the relativity theory of the shrinkage effect, because the ruler does not move, the car remains stationary under the inertial frame, so all the properties of the ruler do not change, including the property of length. It should be judged according to the frame of reference.

The theory of relativity is a theory about space-time and gravity, mainly founded by Albert Einstein, and can be divided into special relativity and general relativity according to the different objects of his research. The theory of relativity and quantum mechanics brought revolutionary changes to physics, and together they laid the foundation of modern physics. The theory of relativity has greatly changed mankind's "common sense" concept of the universe and nature, and has put forward new concepts such as "simultaneous relativity", "four-dimensional space-time", and "curved space-time".

This question is really nerve-wracking, according to the length shortening formula.

x'=(x-vt) (1-(v 2) (c 2)) In this place the denominator family can not be 0, that is to say, v cannot be the speed of light, when the speed of the object is the speed of light, the object's own time will stop, then the distance is meaningless for it, (time is gone), in this problem, if you take yourself as a frame of reference, then whose length is shortened in the mu?

So, we should set the photon as a stationary frame of reference, the surrounding objects move relative to the photon at the speed of c, and for the photon, the distance is meaningless, the distance it travels depends entirely on your own will, you let it go for a year, it will go for a year, but only a second has passed relative to it. So, in the movement of two beams of light, relative to your time, that is, when you think that the time in your world is the same, they also travel the same distance, you may be confused when you see this, to give a simple example, if you are about to die (if) and you want to see the world in a few hundred years, then you just move at the speed of the Spike Mountain, all your time will stop, including metabolism, and you will also be immortal, of course, the time in the outside world is passing, maybe after you get up from sleep, The world is already hundreds of years old, then, as long as you stop and take a look at the scenery of the world, the next second you will die.

There is an issue that is often overlooked.

We usually talk about the rotation of relative transporters, but no one has ever thought about how to move relative to each other.

For example, if we say that a train is moving at a uniform speed relative to the ground, which piece of ground is it relative to?

The concept of uniform linear motion is: distance time constant.

If it's a piece of ground on the opposite side, think about it, will it be a uniform linear motion? Would the ground on the opposite side be a distance time constant?

Therefore, the so-called two inertial frames of relative motion can only be on the same straight line along the direction of motion. From the point of view of the frame of reference, there are only two possibilities for the kinematic system to move away or approach at a constant velocity. There can be no lateral movement, therefore, the shortening of the distance can only be in the direction of motion, there can be no lateral movement.

Because the lateral velocity is 0.

The Lorentz transform is limited by the fact that there is only one velocity in the x-axis direction that coincides with the reference frame, and no components in the other directions. If there is a velocity component in other directions, it does not meet the definition of an inertial frame. The Lorentz transform cannot be applied.

From the concept of "measurement", the measurement of length must be done at the same time at both ends of a certain length, but because the concept of "simultaneous" varies in different reference frames. This process can be considered with the help of the principle of invariance of the speed of light, in different frames of reference, since the speed of the action of "seeing" is the speed of light, and the "distance" is different, it must be measured first by seeing the end "heading" towards oneself, and then measuring after the other end, so the length must be shorter.

A simpler analogy is like taking a ruler scale to measure a certain length, and the line of sight must be perpendicular to the ruler surface, otherwise it will inevitably be wrong; In different frames of reference, it is like looking sideways to measure, and different side angles have different lengths. The difference in this analogy is that the strabismus ranging is always longer than the actual value, and the distance measurement in different reference systems is always shorter than the actual value.

If we understand it from a mathematical point of view, combined with the Lorentz transformation, in fact, time and space are combined into a unified space-time coordinate, the Lorentz transform obeys the constant c t -x -y -z, and the reference frame with different velocities is equivalent to deflecting the x and t axes (assuming the velocity is in the x direction), and the measured length is an invariant c t -x in four-dimensional space-time, and the projection of this invariant on the x-axis (that is, the length we usually say) is the largest in the stationary reference frame, and in the motion reference frame, due to the rotation of the coordinate system, this amount is in x The projection of the axis is necessarily shorter than the original value.

The most correct way to put it is the change of time and space.

This explanation should be understood: if there is a coordinate system a(x,y,z,t), and these axes are marked with scales, the old view of space-time believes that no matter how the coordinate system moves, the scale interval in this coordinate system will not change, that is, the length of one meter will always correspond to one meter, and the interval of one second will always correspond to one second, and it will not change; If you yourself are in this frame of reference, then the conclusion you observe is indeed this.

But if you jump out of this coordinate system, for example, if you are in another coordinate system B (B also has the same scale as A), the situation is very different. Suppose that A and B are moving at a high speed, and you compare the scales corresponding to the two coordinate systems, you will find that the one meter on the other side is shorter than the one meter on your side (the ruler shrinkage effect), and the one second on that side is slower than the one second on this side (the clock slow effect), that is, the space-time of A has a certain proportion of expansion and contraction relative to B!

This kind of expansion and contraction is the expansion and contraction of space-time itself, that is to say, the ruler is still the ruler, one meter or one meter, there is no change, what changes is space-time itself; This effect is seen from another frame of reference, which is really shrinking and slower, and the relative space-time expansion and contraction is absolutely shortened and slower under the description of another frame of reference.

Just remember one thing: special relativity is a theory of space-time. (And not theories about the speed of light, how it is measured, vision, etc.).

Put on your binoculars and look at it.

You're getting it wrong. l does not mean the distance traveled or the distance traveled, nature has nothing to do with time multiplication. l refers to the measured length, let's say you are on a spaceship (i.e. the spacecraft is relatively stationary), and you see the total length of the spacecraft as L1, while the total length of the spaceship on the ground is L2.

This is the measurement length (spaceship length), satisfying l2=l1 r, then l2 the distance you understand is incorrect, because the earth sees the spaceship moving s2, and you see that the spaceship is actually stationary, because you are on the spaceship, there is no relative motion, so s1=0. Obviously, the meaning of the l you understand is incorrect.

I don't understand, what does l2=l1 r mean?

Wrong, the other party's ruler is shorter than it seems.

For example, the relative velocity of A and B is that A has a ruler of 6, and what you see on B is 10, and B transforms it according to the theory of relativity, and you know that the other party's ruler is 6.

b also made a ruler of 6, and the previous measure on a was 10, and the first calculation knew that it was 6. It was found that the two rulers were the same length.

There will be no contradictions.

Let's take a look at the meaning of the Lorentz factor:

A in the diagram above is an inertial frame moving with velocity v relative to O, and B is a point on the A system.

When A and O coincide, a photon is emitted from A to B.

The photon path seen on the A system is CT', the photon path seen on the O system is CT, and A is seen to have moved the distance of Vt in time T.

The relationship between the three lengths is: (ct')²＋vt)²＝ct)²

Solve t'Or t and you get :t'＝t√(1－v²/c²)；Or: t t'/√(1－v²/c²)

Among them: 1 (1 v c ) is the relativistic factor, which is also called the Lorentz factor because it is derived from Lorentz. Some books use tables.

Some books use , and some books use . Lorenz liked to use , and Einstein liked to use .

Looking at the formula alone, it seems to be t'"It became shorter", but as you can see in the diagram, no matter how large or small the velocity v is, on CT'None of them had any effect. The relative velocity only affects the observed value ct on the o system. So it's not actually CT'It became shorter, and the CT became longer.

But. The frame of reference is the datum of the measurement, and the datum is not allowed to change in the same system, so it must be assumed that the observed data on o is unchanged, and in contrast, the time on a slows down and the length becomes shorter.

After understanding this truth, it will help the thinking when solving the problem, and there will be no more confusion.

It's like looking at distant objects that will get smaller, but that's just a measurement, it's a matter of distance, not that the other person is really getting smaller. However, since the value of the other party is extrapolated from the measured value, it is necessary to transform it.

The Lorentz factor is the conversion factor between the measured value and the value of the other party. In fact, it is a correction of the measured value.

Because the bell has a process of acceleration and deceleration, the bell is a non-inertial frame, and it is no longer equal to the earth's inertial frame, so it is absolutely slowed down.

For example, if the clock has been moving at a constant speed and high speed, and the time is right when it passes over the earth, and then a spaceship is sent on the earth to catch up with the clock, you will find that the spaceship time has slowed down.

In high-speed motion (close to the speed of light), its space-time will slow down, so the clock will also slow down, and the time will be less;

Your question: You can't use Newton's classical mechanics to explain the interrelationship of the motion of objects, and you can never explain this problem with Newton's classical mechanics, and the speed of the motion of objects is related to the speed of space-time, but two different things.

Although Einstein's special theory of relativity surpassed Newton's classical mechanics and opened the way for quantum mechanics, he himself still adhered to Newton's classical mechanics.

After returning to Earth, the relative velocity becomes smaller, and the time is almost zero.