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为了在课堂上演示力的合成和分解,我用木工用的折尺做了一个力的合成和分解演示器,经使用其效果良好,现介绍如下:买3个木工用的折尺(每个折尺共有八段,共1米长)。因折尺的头、尾两段较短,应把它去掉。然后利用原来去掉的头、尾两段后留下的空心铆钉,将2个或3个折尺铆接起来,做成一个有15段左右的折尺。有些折尺铰链铆接处的空心铆钉的小孔并不通,可将稍大的钉子用鎯头把铆钉的小孔打通。这个教具就算完成
In order to demonstrate the composition and decomposition in the classroom, I made a force synthesis and decomposition demonstrator using woodworking folding ruler. After using it, the effect is good. Now I introduce the following: Buy 3 folding rules for woodworking (each There are eight sections of folding rule, a total length of 1 meter). Because the length and length of the folding rule are shorter, it should be removed. Then, using the hollow rivets left after the head and tail sections were removed, two or three folding feet were riveted together to form a 15-foot folding rule. Some holes in the hollow rivets of hinged rivets are not open. The larger nails can be used to open the small holes of rivets with a hoe. Even if this teaching aid is completed