Junior high school physics, what is the meaning of the reference object, and how to identify what to

In the study of mechanical motion, the object that is pre-selected and assumed to be immovable as a reference is called a reference.

Generally, the research object is not used as a reference) In general, the ground is mostly used as a reference. References can be arbitrarily selected.

Choosing different references to describe the motion of the same object may lead to different conclusions, so both motion and rest are relative.

When studying the mechanical motion of an object on the ground, an object that remains relatively stationary from the ground is usually used as a reference.

Extended Materials. The choice of reference is arbitrary, and it is possible to choose an object that is stationary relative to the ground or an object that is in motion. For example, to study the motion of an object on the ground, the ground or an object at rest relative to the ground is usually selected as the reference.

The object under study itself cannot be selected as a reference, because the object of study is always stationary with the object of study as a reference.

Note: Do not put the ground on the ground. Most of the references that are not represented are based on the ground.

Taking the earth as a reference is actually taking the center of the earth as a reference, and using the center of the earth as a reference object is to assume that the center of the earth is not moving, and it is also conceivable that the observer is at the center of the earth.

Using the ground as a reference means assuming that a certain point on the earth's surface (not the entire earth's surface) is stationary, and it can also be considered that the observation site is that point on the earth's surface. The ground moves in a circle around the axis of rotation of the earth, so the description of the motion of the same object is different when choosing the ground or the earth as a reference.

Reference Encyclopedia - References.

A reference system is a general term for a reference object and a coordinate system. Sometimes the reference object is simply called a frame of reference.

Note: 1) If the motion of an object is measured relative to a certain reference frame, when the object is not subjected to an external force or the combined external force is zero, it strictly remains stationary or moves in a uniform straight line, then this reference frame is called an inertial reference frame. That is to say, the frame of reference in which Newton's first law of motion is established is called an inertial frame of reference, referred to as an inertial frame; A frame of reference where Newton's first law does not hold is called a non-inertial frame of reference, or non-inertial frame for short.

A frame of reference that is stationary or moving at a uniform speed (straight line) with respect to an inertial frame of reference is also an inertial frame.

2) Experiments have proved that stars and solar systems (reference frames with the center of the star or the sun as the origin of coordinates and a straight line pointing to any star as the coordinate axis) are very accurate inertial frames. The Earth can be seen as an inertial frame with a fairly good approximation, so the Earth is usually chosen as the inertial frame of reference to study the motion of objects on the ground.

When dealing with kinematic problems, the choice of reference system is arbitrary, that is, it can be arbitrarily selected according to the convenience of solving the problem. Of course, relatively different frames of reference for the same object appear as different motions. However, when solving a dynamical problem, an inertial frame of reference must be chosen, otherwise Newton's laws of motion no longer hold.

3) The reference system used to be used as a reference system, and according to the "Physics Terminology (Basic Physics Part)" published by the National Natural Science Terminology Examination and Approval Committee in 1988, the reference system is not called the reference system.

1. Another object used to determine whether an object is moving is called a reference object. A large stupid object, whether in motion or at rest, is relative to a reference.

2. Whether the object is moving or stationary depends on which other spring omen object is used as the standard. This object that has been selected as a standard is the reference.

3. To determine whether an object is moving or stationary, it is necessary to see whether there is a change in position between the object and the selected reference. If there is a change in position, the object is in motion with respect to the reference object; If there is no change in position, the object is stationary with respect to the reference.

An object, whether in motion or at rest, is relative to a reference. You can think of the reference as you, and then it's easy to analyze the problem. For example, is a boat moving? You see the mountains as if you were looking at the boats;

To determine whether an object is moving or stationary, we must first select an object as a standard, and this object that is selected as a standard is called a reference object. References can be arbitrarily selected. Choosing different references to describe the motion of the same object may lead to different conclusions.

Try to look at the problem from the perspective of the reference, this kind of question is not difficult.