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为了使学生从感性上确认,斜抛运动可以看作是两个分运动的合运动:一个是水平方向的匀速直线运动,速度等于υ_x;另一个是竖直上抛运动,初速度等于υ_y。我们在教学过程中做了下面一个简单的演示实验。方法是在一辆实验小车上竖起一根钢管,并在针对钢管底部的车身上开一个圆孔,钢管内竖放一根压簧,压簧上端盖一块铁片并连结一根较长的拉杆且于拉杆底部连一短横杆,短杆长度必须小于孔径,钢管应固定在小车上。
In order to enable students to confirm from the sentiment, oblique throwing movement can be seen as a combination of two sub-movement movement: one is the horizontal uniform linear motion, the speed is equal to υ_x; the other is vertical throwing movement, the initial velocity is equal to υ_y. We did the following simple demonstration experiment in the teaching process. The method is that a steel pipe is erected on an experimental car and a round hole is opened on the car body at the bottom of the steel pipe. A pressure spring is erected vertically in the steel pipe, the upper end of the pressure spring is covered with an iron piece and connected with a longer Draw rod and rod at the bottom of a short crossbar, short rod length must be less than the aperture, steel pipe should be fixed in the car.