Concept analysis When measuring gravity, the force measured by the spring is gravity? Liu Bangxing gently hangs the object under test under the spring scale. When the object is stationary, the number of spring scales is the size of gravity. As long as students who have studied mechanics know this method of measuring gravity, few students are going to pursue the principle of this measurement. Over time, not only do not know the measurement principle, and even some misunderstandings and arguments. Typically, when the object is suspended under the spring balance, the force measured by the spring is gravity. Is this correct? We know that the force measurement principle of the spring balance is that when the spring is subjected to a force, the spring is deformed. The number of spring balances is the force that makes it deform. When measuring the gravity of the object 1 with a spring. The force that causes the yellowing to be deformed; the force applied by the heart of the factory is that the object to be measured 4 is a spring, but the object of gravity 6 of the object 4 is the earth, and the object of force is the meaning of the object. The force is not the same as the nine. It is obvious that the force of the spring balance is that gravity is wrong.
Then why the number of spring balances can indicate that the object 4 is subjected to the balance force, that is, the tension of the spring-like object is balanced with the gravity 5 of the object, and the force is equal, that is, the action of ±= force is mutual, the spring balance pulls the object, the object Also pull the spring 抒, then pull =, pull, the same amount of replacement for the production of pentladon so the number of spring scales is only the size of gravity. Each force has an element. We can't review the gravity of the elemental object 4 and the force of the spring balance. Review the physical concept of the physical concept review method, not only the basic knowledge of physics, but also the analysis and solution. The habit of physics is highly valued. When reviewing the concept of the present. Grasp as good as one. Will get twice the result with half the effort.
The special concept of grasping words will grasp the key words because of the difference between words and grasp the key words firmly. For example, the law of inertia cuts the object to maintain a stationary state or a uniform linear motion state when it is not subjected to an external force. The word or word here is the keyword, and the other of them is intended to mean that the object may remain stationary or may maintain a uniform linear motion state. In this case, it is absolutely impossible to replace the word with the name because it has the meaning of both, that is, the object remains static and uniform linear motion at the same time. Guo Shulong is obviously impossible.
The lengthy concept grasps the key points. Some of the conceptual statements are lengthy, complicated, and inconvenient to remember. When reviewing these concepts, you should not memorize them, but you should grasp the main points and remember them on the basis of comprehensive understanding. The so-called grasp of the main point is to grasp the main characteristics that reflect the essential attributes of the concept. For the concept of electromagnetic induction, it is necessary to grasp the three points of the magnetic circuit movement of the closed circuit part of the conductor.
The similar concept captures some analogy, and its formation process or statement has some similarities. For these concepts, if they can be reasonably analogized on the basis of understanding their physical meanings, then the correct understanding of the efficiency of the heat engine and the mechanical efficiency can be understood and mastered.
For the statement or the physical properties reflected by the relativity, such as reflection and refraction melting and solidification series and parallel path and open circuit, etc., carefully consider, repeatedly check, find out the relatives and understand it. For example, by grasping the opposite phase of the transformation of melting and condensation, the solidification can be known by mastering the melting.
For those concepts that are easily confused, such as gravity and pressure power and mechanical efficiency, heat and internal energy can be grasped by comparison. Column comparison is a common method of comparison
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