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平抛运动是曲线运动和运动合成的典型实例。做好这个实验,对学生进一步认识运动的合成有着重要的意义。限于条件,物体的平抛轨迹必须通过对物体的多次平抛运动进行描点才能获得。这就要求每次平抛的轨迹都要重合。因此,在其它条件都不变的情况,准确地描点就是该实验成败的关键。课本中原来用铅笔挡球法来描点,这显然太粗糙;甲种本中改用框架法描点,又觉费事。为了准确而义较快地描点,我改用痕迹法描点,效果较
Flat throwing motion is a typical example of curve motion and motion synthesis. Doing this experiment well is of great significance to students’ further understanding of the movement’s synthesis. Limited to the conditions, the object’s flat-throw trajectory must be obtained by plotting the object’s multiple flat-throwing motions. This requires the trajectory of each flat throw to coincide. Therefore, in the case where other conditions are not changed, the accurate description of the point is the key to the success of the experiment. In the textbook, the original pencil stroke method was used to describe the point. This is obviously too rough. In order to describe the point accurately and righteously, I use traces to describe the points.