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甲种本第一册“力偶”一节中,图6-11与图6-12的对比实验是认识力偶作用的关键。我用缝纫机上的核心演示,并借助投影放大,效果较好,现介绍如下: 1.在投影器载物台的框架左右两侧各钻两个φ5mm的小孔,再用螺丝将两只活动滑轮(J2108斜面小车装置所附)固定在框架上,如附图(a)。 2.在梭心上绕一条细线,放到载物台上后用手拉这条线,从屏幕上可看到核心同时发生平动和转动,如
In the first volume of the first volume, the “couple of forces” section, the comparative experiments in Figures 6-11 and 6-12 are the key to understanding the role of couples. I use the core demo on the sewing machine and use the projection magnification to get a better result. Now it is introduced as follows: 1. Drill two φ5mm holes on the left and right sides of the frame of the projector stage, and then use the screws to move the two activities. The pulley (attached to the J2108 bevel device) is attached to the frame, as shown in (a). 2. Pull a thin thread around the bobbin and put it on the loading platform. After pulling it on the line, you can see that the core moves and turns at the same time from the screen.