10/11/2023 0 Comments Quantity kind modelioTherefore, the measurement of physical quantity is a necessary means for science and engineering to understand the world and use the laws of nature. If no longer based on the relationship between acceleration, displacement and time, we can also predict where the object will arrive in how long. For example, according to Newton's second law of motion of an object, if we measure its mass and force, we can calculate its acceleration. We can always predict other attributes of certain things in the physical world by measuring certain physical quantities and based on correlations. These attributes and relationships exist in essence, and their existence has nothing to do with our understanding, and it has nothing to do with how we measure them. Of course, time is also one of the key attributes of the motion of an object. Therefore, when studying the motion of an object, its attributes include displacement, velocity, and acceleration. For example, when an object rotates, it must have speed, acceleration, and displacement, and it is also related to time. No matter how we measure these properties, it always exists. We look for these attributes and their relationships, and we can understand the characteristics of things based on these attributes and their relationships. I personally believe that in the physical world, every thing has its attributes. Then people will definitely ask a question, that is, what is the nature of physical quantity, what is the dimension, and what is the unit of physical quantity, and so on. The reason is that we pay too much attention to the conversion of units and neglect the relationship between the various physical quantities in the calculation process, and we confuse the unit of measurement, the dimension and the physical nature of the physical quantity itself, so we often Lost in this calculation. When there are many such calculationsthe and formula is complicated, you will often get lost here and lose the opportunity to understand the results of the calculations. After that, we will examine the formula of each physical quantity(m, l, t), and then do the unit conversion. For example, when we calculate the force of an object in motion, Newton's second law should be used. The reason is that we first consider unit conversion rather than considering the conversion relationship between quantities before calculating. In engineering and scientific calculations, people are often confused because of the dizzying number and units of physics.
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