留迹法呈现离心运动的轨迹

Showing the track of centrifugal motion by tracing method

产生离心运动的原因主要有2种,即合外力不足以提供物体做圆周运动的向心力和合外力突然消失.这2类离心运动的轨迹亦不同.为了更好地观察和理解离心运动,针对第一类离心运动,介绍了利用运动分析软件Tracker、磁性画板及手转台和墨水记录离心运动轨迹的方法;针对第二类离心运动,介绍了利用手机Motion shot软件、运动分析软件Tracker及水写布记录离心运动轨迹的方法.

When the resultant external force cannot guarantee the circular motion or suddenly dis- appears, the object will do centrifugal motion. The movement is different under these two conditions. To better observe and understand the centrifugal motion, three methods were introduced to record the centrifugal track using the motion analysis software Tracker, magnetic drawing board, hand turntable and ink for the first type of centrifugal motion. For the second type, there were also three methods to record the centrifugal track using Motion shot software, Tracker and water writing cloth.