在三角支架中挂有重物G,它产生怎样的两个力?大小如何?斜梁和竖直梁夹角的大小,力的分解产生什么变化等问题,教材用弹簧或橡皮膜做这个实验,同学在正面看不清楚,只有前面几个同学观看得到,同时也不明显,我自制了以下的教具,使这些问题都能得到解决,且一目了然。 The weight G is hung in the triangle support. What kind of two forces? What size does it produce? The size of the angle between the oblique beam and the vertical beam. What happens to the decomposition of the force? The textbook uses a spring or rubber membrane to do this experiment. The students are not clear on the front, and only the students in front of them can see it. At the same time, it is not obvious. I have produced the following teaching aids so that these problems can be solved and they can be seen at a glance.