在讲物体“重心”时,做几个简单有趣的小实验,可以活跃课堂气氛,提高学生学习物理的积极性实验1.拿一个米尺,用两手的食指托住米尺两端,两个食指要伸直,使米尺呈水平状态.然后两手带动食指向中问一起靠拢,直到两手的食指并在一起.在此过程中,米尺要一直保持水平,拇指和手的其他部位尽量不要碰到米尺.可以发现,无论是两个食指一起向中间运动,或者是一个手的食指不动.另一个手的食指向它靠拢.米尺总要做对应的运动,最后两个食指合在一起的位置,正好是米尺的中间部位50厘米处.这十实验可以叫几个学生上来做,并注意使米尺没有刻度的一面和食指接触,极容易成功.它验证 When talking about the “center of gravity” of objects, do a few simple and interesting little experiments that can stimulate classroom atmosphere and improve students’ enthusiasm for learning physics. Experiment 1. Take a meterstick, hold both ends of the metersticks with your two-handed index fingers, and the two index fingers. To straighten, make the metric ruler horizontal. Then, both hands drive the index finger and ask them to move closer together until the two fingers are together. During this process, the meter should be kept horizontal and the thumb and other parts of the hand should not touch. To the metersticks, you can find either the two index fingers move together in the middle, or the index finger of one hand does not move. The index finger of the other hand moves closer. The metersticks always do the corresponding movement, and the last two index fingers fit together. The position is exactly 50 centimeters in the middle of the meter. The ten experiments can be done by several students. It is important to make sure that the scaleless side of the meter is in contact with the index finger. It is very easy to succeed. It verifies