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在力的合成与分解部分有这样一道题:一个物体受到F_1,F_2两个共点力,两力之间的夹角可以变化,F_1=100N,F_2=200N,求两个力的合力F与F_2之间的夹角最大时,合力的数值。这道题有一定难度,解决此题的基本出发点是根据力的平形四边形定则画力的图形,改变F_1与F_2之间的夹角。动态地观察合力F的方向变化情况。通过动态观察会发现在F_1、F_2大小一定的情况下合力F与F_2之间的夹角存在最大值。
In the synthesis and decomposition part of the force has such a problem: an object by F_1, F_2 total of two points, the angle between the two forces can change, F_1 = 100N, F_2 = 200N, find the sum of the two forces F and F_2 between the maximum angle, the resultant force value. This question has a certain degree of difficulty. The basic starting point for solving this problem is to change the angle between F_1 and F_2 according to the graph of the force’s flattened tetragon. Dynamically observe the changes in the direction of the resultant force F. Through dynamic observation, it can be found that there is a maximum of included angle between resultant force F and F 2 when the size of F_1 and F_2 is constant.