How do you judge the reference? To put it simply, urgently

First, determine which object is in motion described in the question, and according to the described motion, determine which object's position changes relative to other objects to meet the topic, then the reference object will be judged.

Example: When bungee jumping, a person feels the ground rushing towards him.

It depicts the ground in motion. The ground satisfies the conditions for upward movement relative to the person who is bungee jumping, so the person itself is used as a reference here.

Arbitrary: The selection of the frame of reference is arbitrary, but should be based on the principle of ease of observation and as simple as possible in the description of the motion.

Variability: Different frames of reference are selected for the same movement, and the observations are generally different. For example, a passenger sitting in a moving car, with the ground as the frame of reference, the passenger is in motion, but if the car is used as the frame of reference, the passenger is stationary.

The reference object is that you regard a moving or immovable thing as stationary, and the object that moves relative to that thing is judged to be in motion, and the object that moves in the same direction as the reference object can be said to be relatively stationary. We generally use the ground as a reference. For example, if you are sitting in a moving car, the car and you are in motion relative to the reference object, and the ground and the trees on both sides are in motion relative to the reference object.

The selection of reference objects is arbitrary, as long as you feel that the situation is appropriate, you can choose whoever is the reference. However, in order to make the analysis more concise when selecting the reference object, we often choose the object that is stationary or moving in a straight line at a uniform speed as the reference. For example, a table, a chair, or a car moving at a constant speed on the highway.

The reference, on the other hand, is considered to be stationary when it is selected. For example, if we choose the car position reference, then we think that the car is not moving, then the driver sitting in the car is not moving relative to the car, and we think that the driver is also stationary; At this time, the flowers and trees on the side of the road are moving relative to the car.

In the same way, if you choose a tree on the side of the road as a reference, then the car is moving forward relative to the flowers and trees.

The general reference is the Earth, because most of what you see is on the Earth, and it looks stationary, and at this point, you can calculate the speed of the car. But if you think the earth itself rotates, and if you think about the sun, the speed of the car is completely different, because even if the car doesn't move, the earth drags the car around and it does it very fast. So the choice of reference is important.

It's like if a car is going 100 kilometers per hour, if the car is the reference, then the person sitting in it is not moving, but the earth is moving backwards, if the earth is the reference, then the car is going forward 100 yards, and the person is moving at the same speed.

The reference object is relative, generally the one that is most conducive to motion analysis is selected as the reference, you can determine it according to the specific situation: for example, the moving car and the like are generally selected as the reference object of the ground or roadside street tree, and the object falling from a high place is generally selected as the reference object of the stationary building or pole next to it. Analyze it a few times a little more and you'll be familiar with it.

References are used as references. Motion is absolute, and rest is relative. To describe a motion we need to first select an object as a reference, and once we have selected the object, then we need to assume that the object is immobile.

The reason why you can't understand it is because you are disturbed by the usual common sense, we usually say that the car is moving, the car is stopped, and there is also a reference, that is, the ground. In fact, when the car stops, you pass by, and you use yourself as a reference, the car is moving away from you.

Therefore, there is a conclusion: the reference object can be selected arbitrarily, and the same object may have different motion results if different reference objects are selected. We usually use the ground or an object that is not moving relative to the ground as a reference.

For the rest of the questions, you only need to compare the two objects given in the question. For example, when we see a building moving backwards in the car, the building is comparing the two sides with us, talking about the situation of the building, so we (the people in the car) are the references. The clouds block the sun, the clouds move, and the sun is the reference.

The moon is blocked by clouds, the clouds are moving, and the moon is the reference.

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

What is the reference of Chinese culture on the historical timeline? Why can it last for more than 2,000 years.

The method of judging the reference object is as follows:

In the study of mechanical motion, people refer to the objects that are selected by the gods in advance and assumed to be immovable as the reference objects. A reference object is a criterion used to determine whether an object is in motion or not. Thus an object, whether in motion or at rest, is relative to a reference.

There are restrictions on the selection of references, and the reference objects cannot be the object of study. In addition, there are two points to note when it comes to the Youpai reference.

Whether an object is in motion or at rest depends on which other object is used as the criterion. This object that has been selected as a standard is the reference. Depends on whether there is a change in position between the object and the selected reference.

If there is a change in position, then the object is in motion with respect to the reference, and if there is no change in position, then the object is stationary with respect to the reference.

Knowledge development

A reference is a type of physics noun that is an object that is chosen as a standard, assuming that it is a moving object (both stationary and moving objects can be a reference) A reference is a type of physics noun that denotes another object on which it is an object. Including cars, ships, airplanes, etc. When an object is on top of this reference, the object on the reference is stationary, while the reference is moving.

The entire extension space that is fixed to the reference body. A reference body is another object that is chosen as a standard for determining the position of an object and describing its mechanical motion. In order to numerically represent the position of an object, a coordinate system can be set on the reference body, which is called a reference coordinate system.

Both the reference system and the reference coordinate system can be selected arbitrarily, but the same motion will behave differently in different reference frames. The appropriate reference body is usually selected according to the actual situation of the problem. For example, when a rocket takes off from the earth's surface, it is advisable to use the earth as a reference body; When the spacecraft becomes an artificial planet orbiting the sun, it is advisable to use the solar vertical fissure as a reference body.

It follows that all mechanical phenomena can only be observed, described, and studied in relation to the selected frame of reference. There can be different reference coordinate systems on the same reference system, and although their values for the position coordinates of the same object are different, they are related by definite geometric relations. In order to quantitatively describe the motion of an object, a reference coordinate system is often used directly.

Reference: Another object used to determine whether an object is in motion or not, called a reference. An object, whether in motion or at rest, is relative to a reference.

For references, pay attention to the following two points: 1Whether an object is in motion or at rest depends on which other object is used as the criterion.

This object that has been selected as a standard is the reference. 2.To determine whether an object is moving or stationary, it is determined 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.

The reference object is the thing that you are studying and comparing ...... object with the object of study

To determine whether an object is moving or stationary, you must first choose an object as a reference, and this object is called a reference.

To describe whether an object is moving or stationary, you must first select a standard object as a reference, and this selected standard object is called a reference.