Abstract: The object is accelerated by inertial force until it contacts with the acceleration system, and it is still acted by inertial force at this time.
If there is no gravity of any celestial body, the spacecraft will fly by inertia. So everyone and everything in the spaceship are here? Weightlessness? State, can float in the air, anything will not fall from the hand. If the spacecraft starts the rocket again and flies forward at a certain acceleration, will the people in the spacecraft feel it again? Weight? Things that used to float in the air accelerated their fall. ? This is the case that the object is accelerated by inertial force.
? If the spacecraft is regarded as an acceleration system, then this force is equal to the force that the floor makes people do accelerated motion, so this force reflects the inertial mass of people. ? This is the case that the object is in contact with the acceleration system due to inertial force.
If the spacecraft is regarded as an acceleration system, then the pressure of people on the spacecraft floor is equal to the force that the floor makes people do accelerated motion, so the force reflects the inertial mass of people. If the spacecraft is regarded as an acceleration system, the pressure of people on the floor can be regarded as the result of inertial force in the acceleration system. An object with a large mass receives a large inertial force, while an object with a small mass receives a small inertial force. When the acceleration is different, the inertia force is different.
Can this situation be analyzed as the situation of applying force and bearing force?
From the point of view of the applied object, the applied object has inertia, and when the motion state changes, the applied object needs force. When the force applying object is in contact with the force applying object, and the force applying object generates acceleration (for example, the force applying object spacecraft and people in the force applying object spacecraft), from the point of view of inertia force, the inertia force of the force applying object is large, while that of the mass object is small, so the force applied to the force applying object is (large or small). In the view of the applied object, when the motion state of the applied object changes, the same acceleration is generated.
Objects with large mass have large inertia and large inertia, while objects with small mass have small inertia and small inertia. The force on the object is f=ma, and the inertia force on the object is f=-ma. This force is equal to the inertial force in the opposite direction.
In a spaceship, the pressure of people on the spaceship floor and the support of the spaceship floor are a pair of action and reaction. People's pressure on the floor can be regarded as the result of people's inertia force. The spacecraft is regarded as a force applying object, and the supporting force of the spacecraft floor to people can be regarded as the force applied by the spacecraft. The resultant force of inertial force and supporting force is zero.
What is inertial force? How do we define inertia force?
Due to inertia, when an object is subjected to an external force, it will produce a reaction force.
Inertia can also cause an object to accelerate. When an object is in contact with the frame of reference, it will feel stressed under the pressure of inertia.
Can inertial force and inertial force cancel each other out? Can the acceleration be added or subtracted from the reference frame of the acceleration system? What is the state of an object with the same acceleration as the acceleration system?
We know, put a small ball on the table in the carriage (the train moves in a straight line at a constant speed). The ball remains stationary relative to the frame of reference. The external force on the ball is zero. Now imagine that the car starts to accelerate to the right. Observing from the car, the ball will accelerate to the left, but the ball is not affected by other objects. So what did the ball do in the frame of reference where the train seemed to accelerate relative to the carriage? If the accelerations are the same, will the accelerations in opposite directions cancel each other out? Do the inertial forces cancel each other out?
In the free-fall system, the object is really attracted, but in the free-fall system, the object is not forced and does not produce force to the outside world (to the reference system). Objects are really attracted by gravity. -This is the relativity of forces. (The original problem is that in a free-fall system, objects are attracted, but in a free-fall system, objects are not subjected to any force and have inertia. So is the object stressed or not? How can a stressed object become an unstressed object? )
Because force is the interaction between objects, when objects don't exert force on other objects, objects don't receive force. When an object is not stressed, it has the property of being stationary or moving in a straight line at a uniform speed.
In the free-fall system, the object is attracted by gravity, but in the free-fall system, the object has no force on other objects and the reference system, and the object itself has no force, so the object is in an inertial state, and the object has the property of keeping still or moving in a straight line at a uniform speed.
Inertia force, when an object is subjected to inertia force, the object itself is not stressed, but in the frame of reference, the object has the nature of being stressed. (with acceleration)
In the unique perspective of the principle of general relativity, we say that an acceleration system without gravity is equivalent to an inertial system with gravity.
Gravitation is eliminated in the reference frame of free fall in gravitational field. In this free-falling system, the law of inertia holds, and an object that is not affected by external forces will maintain its original state of motion. This reference system is really a good inertial system. (Free-falling body system belongs to a non-inertial system)
conclusion
When an object is accelerating, we can't judge whether it is in a non-inertial system (acceleration system) or an inertial system. When an object has inertia, we can't judge whether it is in a non-inertial system or an inertial system. We can't use any experiments to determine whether an object is in an inertial system or a non-inertial system.
The phenomenon that an object is forced to do accelerated motion is equivalent to the phenomenon that the object is at rest or moving in a straight line at a constant speed and is subjected to inertial force (or the phenomenon that the reference system is forced to see an unstressed object doing accelerated motion). The acceleration at which an object does not touch anything. )
Inertia and force can cancel each other out. When inertial force and force cancel each other out, the non-inertial system is a good inertial system. For example, a free-falling body system in a gravitational field.
Generally speaking, inertial system is a part of non-inertial system. When the inertial force and the force cancel each other, the non-inertial system is an inertial system, and the reference system that accelerates or decelerates relative to the inertial system is a non-inertial system. We don't know whether an object is subjected to force in inertial system or inertial force in non-inertial system.