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Whether inertia is a virtual or real force depends on the observer’s reference device.
The car is moving, if someone looks at the driver from outside the car (that is, an observer in the naked car), you will see that due to the acceleration of the car and the forward force caused by this acceleration, the car seat has applied a forward force to the driver’s body. And subsequently, according to Newton’s third law, the person’s body also applies the same force to the chair in the opposite direction. From this observer’s point of view, all forces are real and there is no ambiguity and no naked force is observed.
But from the point of view of the observer of the naked frame, that is, for example, from the point of view of the driver who is in the accelerating device, with the movement of the car, an unknown force pushes his body backwards. He also observes that the objects on the dashboard are thrown in the opposite direction But the agent does not understand this launch. The agent is inertial force.
In the sense that the observer located in the naked device does not notice such a phenomenon and sees everything as obvious and normal, the naked force becomes virtual. This force is even called a mathematical trick.
On the other hand, the originality of force comes from action and reaction, while no physical interaction has occurred for inertia, and for this reason, it is considered virtual.
Therefore, inertial force is not relevant in the bare frame, but it appears in the non-barreled frame.
On the other hand, we know that Newton’s first and second laws are valid only in bare apparatus. In order to be able to write Newton’s first and second laws for bare apparatus, it is necessary to have some virtual forces such as the Coriolis force (the cause of tornadoes), Euler’s force, Let’s add the center (the force felt by the passengers of the car on the bend of the road, or the force of the carousel, etc.) and the force of gravity (not gravity itself) to the equations so that these laws can be written on paper.
An example of another naked device: Let’s consider a rotating disc. A person is standing on this spinning disc (observer of naked frame) and another person is standing outside the disc (observer of naked frame) and watching. A ball from the center of the disc to It is thrown towards the edge of the disc. A naked observer on the disc sees the movement of this ball in a straight line, but a naked observer sees the movement of the same ball in a spiral.
We know that the stars are almost stationary. Even if they have motion, compared to the distance of several million light years from the eyes of an earthly observer, these movements are zero. So why are the stars moving from the point of view of an earthly observer? (apart from the discussion of translational and rotational movements of the earth).
Why do we see the satellites that are constantly in free fall on the orbit with the acceleration of the earth moving?
Answer: non-uniform relative motion of two different devices.
Mr. Dalamber added only one term to the relation of virtual work (which itself is a weak form of the law of momentum).
On the other hand, an acceleration is applied to all the objects attached to an accelerating device and the relative acceleration is zero. So Mr. Dalamber, by subtracting the virtual force ma of the bare device from the equation F=ma, reached the static equilibrium equation F-ma=0.
If they give us the acceleration data of several objects and ask if the cause of these accelerations was a real or virtual force? We say that if the acceleration of at least one of the objects of the device is different from the others, then we say that the moving factor is a real force.
In physics, everything depends on where the reference zero is. The first step is to choose the reference device. Because all the relationships will be written on this basis. Both Newton’s laws are valid in the bare device and Dalamber’s principle in the bare frame. It depends. Where to install the camera?
This post is written by pwhdnxj