用冲击摆测弹丸的速度,是一个传统的学生实验内容。这个实验对于培养学生的实验操作能力,训练学生的实验技能技巧等均能起到良好的作用。长期的教学中发现,学生在该实验中,往往由于缺乏从理论上对实验进行深入、细致地研究,缺乏对实验过程和实验器材的慎密观察,因而容易产生一些错误的判断,这些问题集中起来,有以下几个方面:其一,对冲击摆摆箱的运动所持的观点不同,一方认为,摆箱的运动属纯平动;另一方则认为属纯转动。 The use of impact pendulum to measure the speed of the projectile is a traditional student experiment content. This experiment can play a good role in cultivating students’ experimental ability and training students’ experimental skills. In the long-term teaching, it was discovered that students often lacked in-depth and meticulous research on the experiment in theory because of the lack of careful observation of experimental procedures and experimental equipment, and thus were prone to some wrong judgments. These problems were concentrated. There are the following aspects: First, the views held on the movement of the pendulum box are different. One party believes that the movement of the box is a pure translation; the other party considers it to be a pure rotation.