The structure of sand production line is complex, and there are many machines used in one production line. How can these machines achieve a delicate balance? In this paper, the knowledge of Newtonian mechanics is used to solve the mystery for us.
Newtonian mechanics takes the particle as the object and focuses on the concept of force. When dealing with the problem of particle system, it is necessary to consider the force on each particle separately, and then infer the motion of the whole particle system.
It believes that the mass and energy exist separately and are conserved respectively, which is only applicable to the range where the speed of motion of objects is far less than the speed of light. Newtonian mechanics mostly adopts intuitive geometric methods, which is more convenient and simple than analytical mechanics in solving simple mechanical problems.
Modern scientific experiments and theoretical analysis have shown that in nature, interactions between celestial bodies, as small as interactions between basic particles such as protons and neutrons, all obey the law of conservation of momentum. Therefore, it is one of the important and universal objective laws in nature, and has a wider scope of application than Newton's law of motion.
Examples where Newton's law of motion is not applicable and the law of conservation of momentum is applicable
When we investigate the emission and absorption of light, we will see such a phenomenon: sometimes very bright light will be suddenly emitted from somewhere in the space, which is called supernova. But it soon became dark. It takes millions of years for light to travel from such a supernova to reach the Earth. In contrast, the time from light emission to extinction of a supernova is too short.
When the light from the supernova reaches the earth, it gives the earth a slight push, while the earth cannot give the supernova a slight push at the same time, because it has disappeared. Therefore, if we imagine the interaction between the Earth and the supernova, it will not be the same size and opposite direction at the same moment. At this time, Newton's third law is obviously no longer applicable.
Nevertheless, the law of conservation of momentum is correct. However, we must also take light into account. When a supernova emits light, the star recoils and gains momentum. At the same time, the light also takes away momentum of equal size but opposite direction. When light reaches the earth after millions of years, it transmits its momentum to the earth. What should be noted here is that momentum can not only be carried by physical objects, but also spread with light radiation. When we consider the above point, the law of conservation of momentum is still correct.
Apply advanced scientific knowledge to mechanical principles. The application of Newtonian mechanics to the assembly of sand production lines points out a direction for enterprises to move forward, that is, to take the road of science and technology revitalization. The application of Newtonian mechanics makes each sand making equipment in the sand making production line operate reasonably, saves energy and makes resources applied.
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