我们看不见重力,却能感觉到重力的作用。我们先来做个实验,感受一下重力的存在:你需要:一本杂志,纸,一本小书,线,胶带,15厘米长的木棍。第一步:一只手托着杂志,一只手托着纸,同时将它们丢下。哪个先落下?第二步:一只手拿着杂志一边,一只手拿着纸的一边,同时将它们丢下。是什么把它们向下拉?第三步:在小书上捆一根线,把线的另一头系在木棍上。两只手拿着木棍,别松手。请搭档把书 We can not see the gravity, but we can feel the effect of gravity. Let’s start with an experiment and feel the gravity: you need: a magazine, paper, a small book, thread, tape, and a 15 cm long stick. The first step: one hand holding the magazine, one hand holding the paper, while leaving them. Which one should fall first? Step Two: Holding one side of a magazine with one hand, holding one side of the paper with one hand and dropping them at the same time. What makes them pull down? The third step: tie a small thread in the book, the other end of the line tied to the wooden sticks. Two hands holding a wooden stick, do not let go. Please partner to the book