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如何正确进行物体受力情况分析,往往是学生在学习力学中遇到的一个大难题。物体受力情况复杂,因素繁多,不少学生感到受力分析问题无章可循,无从下手,往往不是多找或少找一个力,就是方向标错,甚至将物体所受力与所施力混为一谈。其实,受力分析还是有章可循,有办法可找的。根据笔者多年教学经验大致有这么几种方法:一、根据物体运动状态来判断受力情况由于力是改变物体运动状态的原因,所以可以根据物体是匀速运动还是变速运动,是直线运动还是曲线运动来判断物体受力情况。例1:如图物体 A 与水平传送带一起做匀速直线运动。对 A 进行受力分析。
How to correctly analyze the situation of object force is often a big problem that students encounter in learning mechanics. Objects subject to the complex situation, many factors, many students feel force Analysis of the problem Unfurnace, can not start, often do not find more or less to find a force, that is, the wrong direction, and even subject to force and force Confused. In fact, the force analysis is still rule-based, there are ways to find. According to my teaching experience for many years, there are several ways: First, according to the state of motion to determine the force situation As the force is to change the state of motion of objects, so you can object is uniform motion or variable speed motion, is a straight line or curvilinear motion To determine the object stress situation. Example 1: Figure A and the horizontal conveyor belt to do a uniform linear motion. A for force analysis.