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研究物体的受力情况对于解决全部力学问题是十分重要的,所以,不论接触是静力学问题,还是动力学问题,皆应孤立所研究的物体对之进行正确的受力分析。我们认为,在教学的过程中须着重指出,对物体进行受力分析的思路是: 1.确定所研究的物体,分析这一物体受的所有外力,求出这些外力的矢量和。 2.据牛顿第二定律,物体所受诸力的合力等于ma!进一步分析物体所获得的加速度,以便把问题区分为静力学问题或动力学问题。若a=0,则物体处于平衡状态,这便是静力学问题,若a≠0,则是动力学问题,即合力的作用致使物体获得加速度,物体运动状
It is very important to study the force situation of the object to solve all the mechanical problems. Therefore, whether the contact is a static problem or a kinetic problem, the object under investigation should be isolated and correctly analyzed. In our opinion, it is important to emphasize in the process of teaching that the idea of stress analysis of an object is to: 1. Identify the object under study, analyze all the external forces exerted on the object, and find the vector sum of these external forces. 2. According to Newton’s second law, the resultant force of the object is equal to ma! Further analysis of the acceleration obtained by the object so that the problem can be divided into a statics problem or a kinetic problem. If a = 0, then the object is in equilibrium, which is the problem of statics, if a ≠ 0, it is a dynamic problem, that is, the resultant force causes the object to gain acceleration,