Is inertia related to gravity, and the relationship between inertial force and gravity

Inertia is a tendency to maintain the original state of motion, which is only related to the mass of the object, and has nothing to do with whether it is in motion or not.

This is the explanation in the book, but to understand it is best combined with the ox certain reason, that force is the cause of changing the motion of an object, not what sustains it. The force is to change the state of motion of an object, not to maintain it. (The force here is best understood as the resultant force).

Therefore, we can introduce the concept of inertial force, which can facilitate our understanding of the problem of relative motion force, for example, it is directly related to inertia in the problem of overweight and weightlessness, and the force of excess weight here can be understood as inertial force.

Here I would like to add that the inertial force is a "passive" force, similar to the centripetal force, which should not exist, and its existence is a reaction force due to the existence of the "active" force (the "active" force is the force that changes the state of motion of the object), which is the embodiment of its original state of motion, I hope this can help you understand inertia!!

In this problem, the passivity of the inertial force is reflected, it is the gravitational force that has the inertial force, which can only hinder but not prevent the object from changing its state of motion!! That's when inertia exists!!

A physics experiment to see the effect of gravity on inertia.

The definition of inertia is:

All objects remain at rest or in a uniform linear motion, unless a force acting on them forces it to change its state.

1. The physical meaning is different; Inertia refers to the property of an object that remains at rest or in a state of uniform linear motion; Whereas, force refers to the action of an object on an object. Inertia is a property of the object itself, which always has this property, and it has nothing to do with the external conditions of the potato; The force is only when the object and the object are numbered and touched, and the force does not matter without the object.

2. The elements of composition are different: inertia only has a size, no direction and application point, and the size has no specific value and no unit; The force is composed of three elements: size, direction and point of application, and its magnitude has a specific value, and the unit is the ox.

3. Inertia is the property that keeps the state of motion of an object unchanged; The force action is to change the state of motion of the object.

Inertia is not a type of force. Inertia is not a type of force, and inertia is not a force. The property of an object to remain at rest or in a state of uniform linear motion is known as inertia.

Inertia is an intrinsic property of an object, which is manifested as a degree of resistance of an object to a change in its state of motion, and mass is a measure of the magnitude of an object's inertia.

Inertia and what to do1. The size of inertia is only related to mass, not speed.

2. The property of an object that remains in its original state of rest or in a state of uniform linear motion is called inertia. Inertia is an inherent property of all objects, and inertia exists objectively and has nothing to do with the motion state of the object, whether it is subjected to force or not.

3. Inertia represents the ease with which the motion state of an object changes. The magnitude of inertia is only related to the mass of the object. It is relatively difficult to change the motion state of an object with a large mass, that is, it has a large inertia; The motion state of an object with a small mass is relatively easy to change, that is, the inertia is small.

Inertial force refers to the tendency of the object to maintain its original motion when the object accelerates, and if the object is used as the coordinate origin, it looks as if there is a force acting in the opposite direction on the object, so it is called inertial force. Because the inertial force does not actually exist, only the force that originally accelerates the object, the inertial force is also called the imaginary force. Its concept was developed because Newton's laws of motion do not apply in non-inertial frames.

However, for the sake of mental convenience, it can be imagined that in this non-inertial frame, in addition to the forces caused by interaction, there is also a force caused by the non-inertial frame, the inertial force.

For example, when a bus brakes, the people in the car lean forward because of inertia, and it appears to the people in the car as if there is a force pushing them forward, which is the force of inertia. However, only the friction force acting on the brakes and tires of the bus slows down the bus, and there is no force to push the passenger forward, which is just a phenomenon of inertia under different coordinate systems.

The inertial force was introduced to compensate for the hypothetical force that the motion of an object in a non-inertial frame of reference does not satisfy Newton's laws of motion.

Imagine a stationary train with a small ball on a smooth table in the carriage, which was originally stationary; Now the train begins to accelerate and start, and it seems to the people on the ground (apparently he chose an inertial frame of reference - the ground) that the ball is not moving, but in the eyes of the people on the train, the ball is moving in the opposite direction to the direction of the train's motion, and the acceleration and the acceleration of the train are equal in magnitude, and the direction is opposite, the force analysis of the ball is carried out, the ball is only affected by gravity and supporting forces, and these two forces are balanced in the vertical direction, according to Newton's laws of motion, The ball doesn't move anyway, but in fact you do see it moving in the car. This is a limitation of Newtonian mechanics. In order to compensate for this shortcoming, we have introduced the concept of "inertial force", in which an acceleration equal to the value of the non-inertial coefficient and in the opposite direction is artificially added to an object in a non-inertial frame, because this "acceleration" is caused by inertia, so the force that causes this "acceleration" is called an inertial force, so that the phenomenon observed by the person on the train can be explained formally.

This is only to be able to study the problem in a non-inertial frame using Newton's laws of motion, which is in fact a property of the object itself, not a force.

The use of inertial forces can explain why, when moving at variable speeds, the drag force is less than the applied force, while the reaction force is equal to the applied force.

According to Newton's first law, the inertial reference system exists objectively (according to inference), then the acceleration of the concrete object relative to the inertial reference system is also objectively determined, and the magnitude of the inertial force is proportional to the acceleration and the amount of the object, and the direction is inversely proportional, that is, the inertial force is equal to -ma. Our concept is that when an object is in a state of variable speed motion, the object will be subjected to inertial force, and the direction is the degree that hinders the variable speed motion, so the direction and acceleration are negative in the opposite direction, and the other four forms of force acting on the object are in equilibrium. Whereas, the inertial force is the corresponding energy which is kinetic energy.

At present, the concept of inertia in mechanics (theoretical mechanics) and physics (theoretical physics) is confusing, and the mainstream concept is wrong. Therefore, it is difficult for the majority of scholars to master, feel that physics is too difficult to learn, and lose many physics enthusiasts. Because we have not properly understood the essence of Newton's second law, Newton's three laws are the theoretical basis of science and technology, and it is obvious that such a big mistake will have a great impact.

Let's talk about it in detail next time! July 1, 2019 Hu.

An inertial force is a fictitious force that is a hypothetical force that does not actually exist for the convenience of studying the problem in a non-inertial frame. Because the famous three laws of motion of Newton are no longer applicable in non-inertial frames, inertial forces are introduced in order to apply the laws of inertial frames in non-inertial frames as well. Strictly speaking, an inertial force is not a force because it does not exert force at all.

Inertial force and inertia are two different things.

Upstairs is basically correct, but with the addition of relationship issues.

Downstairs, the landlord asked about inertial force, not inertia! They are two different concepts.

When the car brakes suddenly, people will lean forward, but people are not forced, so people have an illusion of a force to explain this phenomenon, this is the inertial force, the inertial force is not a force, but it participates in the work, satisfies the kinetic energy theorem, but I advise you not to study, because it will confuse you, and the college entrance examination and competitions are not required.

In a non-inertial frame that is moving in a straight line with a linear acceleration, the force experienced by the particle in the opposite direction to the acceleration a of the non-inertial frame and equal to the product of the mass m of the particle and the acceleration of the non-inertial frame a is called the inertial force

Causality, because there is inertia, there will be inertial force, but inertial force is an imaginary force. According to the theory of relativity, the inertial force is equivalent to the gravitational force.

Inertial Force Definition:

In non-inertial frames, the illusion force introduced in order to maintain the Newton's motion theorem is still true.

The inertial force f (vector) m*a (vector).

There is only inertia, there is no "inertial force".

Supplementary to the first floor: the inertial force is not a real force, but is an imaginary force that is conveniently introduced artificially.

Objects in any non-inertial coordinate system are subjected to inertial forces.

At present, most of the physical theories of the earthlings are wrong, or inaccurate, especially the misunderstanding of Newtonian mechanics in the theory of relativity, and almost everyone is "spreading falsehoods"...It has made a simple world of physics so confusing that many people have begun to hate physics...

In fact, there is no inertial force, he is just imaginary, please refer to the encyclopedia for details.