论文部分内容阅读
一、等积分析法:是在对物理过程、现象进行分析的基础上,运用物理概念、规律、找出与待求量有关物理量的极值、然后依等积或分式性质求出待求量极值的一种方法。例1:有一高80厘米,直径为60厘米,重1000牛顿的圆柱体立在水平地面上,沿其轴线的剖面如图一甲。现欲将木料平放在地面上,那么要木料的哪一个位置,沿哪个方向施力时,才能用最小的力使木料刚好绕 C 点撬离地面开始转动。在图中画出此力的方向,并求出力的大小。
First, the equal-volume analysis method: Based on the analysis of physical processes and phenomena, the use of physical concepts, laws, find out the extremum of the physical quantity related to the quantity to be sought, and then find the demand according to the equal product or fractional nature. A method of measuring extreme values. Example 1: A cylinder with a height of 80 cm, a diameter of 60 cm and a weight of 1000 Newtons stands on a level ground, and a section along its axis is shown in Fig. 1A. Now that you want to place the wood on the ground, where is the position of the wood and the direction in which the force is applied? Only with minimal force can the wood begin to rotate around the point C. Draw the direction of this force in the diagram and find the magnitude of the force.