Why does time slow down when an object is in motion?

According to the principle of special relativity, inertial frames are completely equivalent, therefore, in the same inertial frame, there is a unified time, which is called simultaneity, and the theory of relativity proves that in different inertial frames, there is no unified simultaneity, that is, two events (space-time points) are simultaneous in one inertial frame, and they may be different in another inertial frame, which is the relativity of simultaneity, in the inertial frame, the time course of the same physical process is exactly the same, if the same physical process is used to measure time, Uniform time can be obtained throughout the inertial frame. In the future general theory of relativity, it can be known that in non-inertial frames, space-time is inhomogeneous, that is, in the same non-inertial frame, there is no unified time, so a unified simultaneity cannot be established.

The theory of relativity derives the relationship between the time schedules of different inertial frames, and finds that the time progress of the moving inertial frames is slow, which is the so-called clock-slow effect. It can be understood colloquially that a moving clock moves slower than a stationary clock, and the faster it moves, the slower it goes, and when it approaches the speed of light, the clock almost stops.

The length of the ruler is in an inertial frame"At the same time"The difference between the coordinates of the two endpoints obtained. Due to"At the same time"The length measured in different inertial frames is also different. The theory of relativity proves that a ruler moving in the direction of its length is shorter than a ruler at rest, which is known as the shrinkage effect, and when the speed is close to the speed of light, the ruler shrinks into a point.

From the above statement, it can be seen that the principle of slow clock and ruler shrinkage is that the time schedule is relative. That is, the time schedule is related to the frame of reference. This fundamentally negates Newton's view of absolute space-time, which holds that absolute time does not exist, but time is still an objective quantity.

For example, in the ideal experiment of twins that will be discussed in the next issue, the elder brother is 15 years old after returning from the spaceship, and the younger brother may be 45 years old, indicating that time is relative, but the elder brother did live for 15 years, and the younger brother also confirmed that he lived for 45 years, which has nothing to do with the reference frame, and the time is"Absolutely"。This shows that the time experienced by an object is an objective quantity, absolute, regardless of its state of motion, which is called inherent time. That is, no matter what form of exercise you take, you think that your coffee drinking rate is normal and your daily routine has not been disrupted, but others may see that you have been drinking coffee for 100 years, and it only took one from the time you put down the cup to the end of your life.

According to Einstein's theory of relativity, when an object exceeds the speed of light, i.e. time stops, it means that you have exceeded the prior time, and vice versa... If you want to know more, you can look for his writings.

Because it is subjected to the reaction force and friction in the opposite direction, it acts as a blocking force and weakens the force on the object, so it slowly slows down.

Objects in motion will experience air resistance if they are in the air, and friction on the ground, so they will slow down.

The speed of the object's motion and the distance of the motion are related to the time consumed by the motion, that is, to x and t.

The distance traveled by an object per unit time is called velocity, which is defined by velocity, and it can be seen that an object with a large velocity moves fast, and an object with a small velocity moves slowly, so velocity is a physical quantity that indicates how fast or slow an object moves.

The expression v=δx δt is based on the velocity operation. The available velocity is numerically equal to the ratio of the displacement of the motion of the object to the time taken for this displacement to occur. The unit of velocity in the SI system of units is meters per second.

Fast and difficult are relative, that is to say, there must be a reference to make sense, if the whole universe is as long as you are, no matter how fast you are, you will not feel that time slows down, and you feel that the passage of time is no different from that of you on Earth!

In fact, there is an absolute frame of reference for the velocity of an object, which is the space field quantum. The faster an object relates to the space field quanta, the slower its own molecules, atoms**, and interactions will be. It is manifested in the cesium atomic clock that the time is longer, and the intelligent life is manifested in the slowing down of the mind and the increase of life expectancy.

However, this is limited, in the process of gradually approaching the speed of light, as the object bears, transfers and dissipates more and more energy matter, the separation force between molecules falls from time to time, the temperature of the object rises from time to time, once the limit of the atomic clock and intelligent life is exceeded, the matter collapses, life ends, and time loses its measurement and meaning of existence. In general, it can be assumed that the faster the object, the slower the time itself.

The word relative in the theory of relativity is very important, the faster the speed, the slower the time (also known as time contraction), which means that your time has slowed down relative to others! For example, if you are flying at sub-light speeds, you will not feel that time is slowing down, and if you have a clock, you will find that it still takes 3 seconds to breathe and 10 minutes to eat. And if you fly at sub-light speed for a period of time and then return to Earth, you will feel that your time has slowed down, because your peers at the time of separation are likely to have grown old and you are still young!

In the theory of relativity, there is not only time contraction, but also a size contraction effect, that is, when you are flying at sub-light speed and preparing to fly to Proxima Centauri light-years away (note that the light-years here are the interval of light-speed travel years), but for you who are traveling at sub-light speed, you will no longer be light-years, but shorter than light-years, depending on how close you are to the speed of light, if you are infinitely close to the speed of light, you can become infinitely shorter, and you can reach Proxima Centauri in an instant!

No, because the speed of the object itself is faster, and time does not change in any way.

This statement is incorrect, if in the universe, the speed has become faster, but it may mean that time has also become faster.

Of course not, it is the natural speed of the object that has become faster, the reference object has changed, and time cannot be changed.

This is the conclusion reached by Einstein's theory of relativity, but Einstein's theory of relativity is a hypothesis put forward by Einstein, which cannot be proved yet, so the faster the speed, the slower the time is also a hypothesis, which cannot be proved now.

But we can understand it subtly in the following way:

First of all, establish the concept of "time and space unity", that is, time and space are unified, and the two can be transformed into each other. Time can be seen as a special form of spatial existence, or the other way around.

Then, the absolute velocity of matter in a definite space-time has two components, one is the spatial component, and the other is the temporal component, that is, the velocity in space (usually called the speed of motion) and the velocity in time (usually called the speed of time passing fast and slow), and the absolute velocity of matter is a constant value (limited by this to determine the fastest speed of information transmission in space-time, which for us is the speed of light), if the velocity of matter in space is fast, that is, the spatial component is large, then the corresponding temporal component is small, that is, time will slow down, and vice versa, the same understanding.

It's like the smaller the object, the faster time passes.

The larger the object, the slower time passes.

If you don't believe it, you can observe the cosmic stars, the rotation of galaxies. Always the smaller the volume, the faster the rotation period.

It's the same with creatures. We may think that ants have short lives, but in fact for them. They've been a long time.

If you can compare it with humans. I believe it may be older than human time.

There must be some internal reason for this, but we don't know it now, and we probably never will.

The so-called speed of motion refers to the change in the speed of an object. The speed of the motion of an object is related to the state of the force on the object.

2.Basis. Reference and velocity] The speed of motion refers to the change in the relative distance of a moving object from that reference object per unit time with reference to something else. The evaluation of the speed of the object must be based on the premise of the same reference.

Newton's First Law] Newton's first law, also known as the law of inertia, is defined in middle school textbooks as: all objects always maintain a uniform linear motion or a state of rest when they are not affected by external forces.

Impulse and Momentum] Under the hypothetical ideal premise, the impulse of the object subjected to an external force has the following relationship with the change of the momentum of the object: ft=mv2-mv1=m(v2-v1). f is the net force on the object, t is the action time of the resultant force, and v1 and v2 are the velocities before and after the change of motion of the object, respectively.

ft is the impulse, mv1 and mv2 are the momentum before and after the change in the motion of the object. Note: The average acceleration of the object during the time of the external force is a=(v2-v1) t.

3.Problem analysis.

1) The law of inertia points out that objects have the characteristic of maintaining the original velocity magnitude and direction - inertia, and the state of motion remains unchanged when not affected by external forces. In other words, if the state of motion of the object changes, it must be due to an external force. The force exerted on the object is what changes the state of motion of the object, not the cause of the motion of the object.

The change of the state of motion inevitably involves the change of the magnitude and direction of the velocity, and the change of the magnitude of the velocity is the subject of this problem. Since the same object may be subjected to multiple external forces at the same time, the change of the motion state of the object must depend on the change of the net force experienced by the object.

2) The formula ft=m(v2-v1) shows that the velocity of the object changes when it is subjected to a resultant force. Even though the acceleration of the object a=(v2-v1) t remains the same when the resultant force remains the same in magnitude and direction, the velocity will still change. Of course, since the resultant impulse and velocity momentum are both directional vectors, the formula is a vector operation.

That is, when an external force is applied, only one of the scalar values and directions of the object's velocity changes, and both may change at the same time.

4.Summary. In summary, the speed of the motion of the object is related to the condition of the resultant force on the object.

Considering that the speed of motion referred to in this question refers to the change in the scalar value of the velocity of the object, in other words, the answer to this question can also be concretely said: When the object is subjected to an external force, the magnitude of the motion speed (fast or slow) does not necessarily change, but the motion state must change (at least one of the magnitude and direction of the velocity will change); But if there is a change in the speed of the object's motion, then the object must be subjected to a non-zero resultant force.

According to Newton's first law, if the object is not affected by an external force or the net force of the external force is 0, then it will remain at rest or move in a straight line at a uniform speed, and the speed of the motion is only related to the initial velocity;

According to Newton's second law, if an object is subjected to a force, then f=ma, acceleration is not only related to mass, but also related to the resultant force of the external force, under the action of the force in the opposite direction of motion, the speed of motion will decrease, and under the action of the force in the same direction of motion, the speed of motion will increase;

In addition, velocity is a vector quantity, which has both magnitude and direction, and under the action of a continuous force, the velocity will increase in the direction of this force...

Third, it will eventually be an illusion of human beings. The last point is that the reason why we feel like time is slowing down is because we used to spend 10 hours on the train, but now it only takes 5 hours to take the high-speed train. From this comparison, it can be seen that the impact of speed is very huge, and speed gradually affects time, directly shortening our time to half.

We know that in modern society, efficiency is the first element, to be able to accomplish a thing, the higher the efficiency then the more the person will be reused, the benefit we can look at the speed, as long as the speed is fast enough, most groups in life are benefits, then for the object itself, the faster the speed of the object, is the time slowed down? Time is just a relative thingIf you think that something has been done in a short period of time, you can think that time has slowed down, but the most fundamental thing is that the speed has become faster, and time will not change speed in this short period of time.

Time itself does not change, but according to the theory of relativity, the faster the speed of an object, the faster it can do things in the same amount of time, according to which efficiency is formed, so the faster the speed, the higher the efficiency.

Yes. Because according to Einstein's theory of relativity, the faster an object moves, the slower time passes, so the faster the object moves, the slower time becomes.