在做自然第六册《摆的秘密》一课的实验时,摆锤选取什么材料是个关键。以下是我三次选择的过程。 第一次,我选用钩码做摆锤。它的优点是:改变钩码的个数可以改变摆锤的重量;缺陷是:在改变摆锤重量的同时,摆线也加长了,不符合对比实验的要求。 第二次,我选取大大卷盒(一种小食品盒)做摆 What is the key to the pendulum's selection of materials when it comes to the experiment in a natural book, The Secret of the Sixth Volume. Here are my three choices. For the first time, I chose hook code to make the pendulum. Its advantages are: changing the number of the hook code can change the weight of the pendulum; the defect is that while changing the weight of the pendulum, the cycloid also lengthens and does not meet the requirements of the comparative experiment. The second time, I choose a big volume box (a small food box) to do