Can the so called internal forces be explained scientifically?

I think the so-called internal force is just a folk saying.

I don't think science can explain it now, and it should be just a breath!

This should and should not be, because not everything can be explained by science.

It should be some physical qi, not that there is any qi deficiency or something!

There should be no science to explain this, so it's not clear.

No, is there such a thing as internal force now, I don't believe it.

I haven't seen this internal force in science yet, so I shouldn't have it.

It feels super fantasy.,Hey, in reality, it's really impossible to say if there's this thing.。

It seems that the word internal force only exists in TV dramas, do people in real life really have internal force?

Internal forces are the interacting forces within the system.

Example 1: If the earth and the object form a system, then the gravitational force on the object is the internal force.

Example 2: Two objects collide, the two objects are a system, and the force that collides with each other is an internal force.

An external force is a force outside the system, as in example 2 there is a force f that causes one object to collide with another object when it accelerates, and this force f is the external force.

The so-called internal forces, then, can also be explained by physics, because the internal forces are also interacting, therefore, can be explained.

No, internal force is a force that everyone has passed on by word of mouth, and physics cannot explain it.

Yes, an internal force is a force that is generated inside an object by giving a force from the outside.

The force that does the work independently of the path is called the conservative force, the force that is only related to the position of the object (particle) that is subjected to the force, and the work done by the conservative force along the closed path is zero. If the force is an internal force of the system, it is a conservative internal force.

If we consider the spacecraft and the Earth, the gravitational force between them is a conservative fiber force. For example, gravity, electrostatic field force, spring elastic and imitating force, etc., are all conservative forces.

Conservative force does positive work, and potential energy reduces blindness; If the conservative force does negative work, the potential energy increases.

The force that does not do the work related to the path is called a conservative force, and if the force is an internal force of the system, it is a conservative internal force. False limbs.

If we consider the spacecraft and the Earth, the gravitational force between them is a conservative internal force.

The forces that make each other within a mechanical system are called "internal forces".

The force by which this mechanical system interacts with an external object is called an "external force". The so-called mechanical system refers to the object of specific research. For example, when studying the human body's somersault technique or surgery, the whole human body is regarded as a mechanical system; When studying the technique of throwing a hammer throw, the human body and the hammer ball are used as a mechanical system.

Because it varies with the specific object of study, the specific content of internal and external forces is also different. For example, when throwing a hammer throw, the force of pulling the hammer ball is regarded as the internal force, while when studying the parabolic trajectory of the hammer throw, the initial velocity of the hammer ball is provided by the external force of the human hand. It is also customary to treat the human body as a mechanical system.

The muscle strength in the body, bones, ligaments, joints, fascia and other tissue forces are the internal forces of the human body; Gravity, friction, reaction force of ground support, buoyancy and resistance in the air are external forces of the human body.

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Mechanics is an independent basic discipline, which is a discipline related to forces, motion, and the macro, fine, and microscopic mechanical properties of media (solids, liquids, gases, and plasma), and the study of mechanical motion and its coupling with physical, chemical, and biological motions.

Internal force refers to the force that causes the internal interaction of the member under the action of an external force.

The forces that interact within a mechanical system are called "internal forces", and the forces that interact with external objects in this mechanical system are called "external forces".

The so-called mechanical system refers to the object of specific research. When studying the human body flip technique, the whole human body is regarded as a mechanical system; When studying the technique of throwing a hammer throw, the human body and the hammer ball are used as a system of resistance.

Mechanics. Nature:

The internal force is that the object receives an external force and will inevitably produce resistance. If the object is not subjected to an external force, there is no internal force. Let the cover such as a diver standing on the springboard, the gravity of the diver is an external force, and the elastic force generated by the springboard bending due to the external force is the internal force.

Effect Status:

When the object is deformed by an external force, the relative distance between the internal particles changes, which causes the change of the internal force, and the amount of change of the internal force is an "additional internal force", and the "additional internal force" and the external force are equal in magnitude but in opposite directions, which is used to resist the change of the shape and size of the object caused by the action of external force, and try to restore the object to the state and position before the deformation.

The internal force is that the object is under the action of external factors, such as external forces, temperature changes, so that the initial state of the internal parts or particles of the object changes, and the adjacent parts or particles inside the object produce an interaction force, and this force is the internal force.

Note:

The internal force of the system works on the system, for example, when the shell is **, the **force causes the shrapnel to fly sideways, and the kinetic energy of the system increases.