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1 曲线运动中速度方向的演示实验高中教材中没有演示曲线速度方向的演示实验 ,教材中举了两个生活实例。一个是观察在砂轮上磨刀具的情形 ,当刀具与快速旋转的砂轮接触时 ,就会看到一束火星从接触点沿着砂轮的切线方向飞出。另一个是撑开淋湿的的雨伞 ,让它围绕伞柄旋转 ,从雨
1 Demonstration experiment of speed direction in curve motion There is no demo experiment demonstrating the curve speed direction in high school textbooks, and two life examples are given in the textbook. One is to observe the situation where the tool is ground on the grinding wheel. When the tool comes into contact with the rapidly rotating grinding wheel, it will see a beam of Mars flying out of the contact point along the tangential direction of the grinding wheel. The other is to open the wet umbrella and let it rotate around the umbrella handle from the rain