亚运中的科学，游泳小健将。这一次，我们要来探究亚运中的另一个赛事——游泳。跟着5A班的科学研究员，动手制作一个能在水中游泳前进的小人吧！

This time, we are going to study another event in the Asian Games-swimming. Follow the scientific researchers from Class 5A and make a toy man who can swim in the water!

游泳赛事的介绍

制作并测试会游泳的人

一、实验准备与步骤

1.准备：橡皮筋、回形针、球体、泡沫条（漂浮条）、钢丝（骨架）、透明管、拨水器（可以用塑料管剪制）

1.Preparation: rubber band, paper clip, sphere, foam strip (as the floating strip), steel wire (as the skeleton), transparent tube, water repellent (can be cut from a plastic tube)

2.步骤：

（1）剪下2条3cm左右的漂浮条，再把骨架穿过透明管两边，用剪好的漂浮条塞进骨架两边

（2）穿好漂浮条再把骨架一边往上折弯一边往下折弯，形成人的手臂；

（3）将两条橡皮筋绑在一起；

（4）把橡皮筋放入透明管，再用勾型骨架从骨架另外一边把橡皮筋勾上来；

（5）把勾上来的橡皮筋穿过另一边的橡皮筋，再拉紧橡皮筋。再用回形针穿过橡皮筋，最后把橡皮筋放入透明管中，用勾型骨架勾住拉到底部并用圆形针固定在透明管底部；

（6）用橡皮筋捆紧拨水器，再把拨水器插入骨架，最后把另外一条漂浮条剪成两条，用橡皮筋捆绑在透明管底部，最后把球体三分之一塞入透明管（球体可以用笔画上人的表情），旋转手骨架再放入水中，看看是不是在水里游起来了呢？如果我们翻转旋转骨架，小人会往反方向游吗？

2.steps：

(1) Cut off 2 floating strips for about 3cm, then pass the skeleton through both sides of the transparent tube, and stuff the cut floating strips into both sides of the skeleton.

(2) After stuff the floating strips, bend the skeleton to form a human arm.

(3) Tie two rubber bands together.

(4) Put the rubber band into the transparent tube, and then use the hook-shaped skeleton to hook the rubber band up from the other side of the skeleton.；

(5) Pass the hooked rubber band through the rubber band on the other side, and then tighten the rubber band.Then use a paper clip to pass through the rubber band, and finally put the rubber band into the transparent tube, hook it with a hook-shaped skeleton and pull it to the bottom and fix it with a round needle at the bottom of the transparent tube.；

(6) Tie the water repellent tightly with a rubber band, then insert the water repellent into the skeleton, and finally cut the other floating strip into two, tie it to the bottom of the transparent tube with a rubber band, and finally stuff one-third of the sphere into the transparent tube (the sphere can be painted with the expression of the master), rotate the hand skeleton and put it in the water to see if it is swimming in the water?If we flip the rotating skeleton, will the toy man swim in the opposite direction?

二、实验原理

橡皮筋具有较好的弹性，实验就是利用了橡皮筋的弹性。首先，将橡皮筋绞紧骨架后，由于橡皮筋产生形变后会恢复原状，放入水中松手时，弹性势能会转化为动能，从而推动着小人向前进。

The rubber band has good elasticity, and the experiment uses the elasticity of the rubber band. First of all, after the rubber band is tightened on the skeleton, it will return to its original state due to the deformation of the rubber band. When it is put into the water and let go, the elastic potential energy will be converted into kinetic energy, thereby pushing the toy man forward.

三、小任务

看完本期内容，你是不是已经迫不及待地想试一试了！请把你的实践操作通过以下方式分享给我们大家哦！

After reading the content of this issue, I bet you can’t wait to give it a try! Please share your experiment with all of us in the following ways!

1. 录制实验视频，发送至邮箱hwflscienceking@126.com。实验视频包括材料准备、实验过程、介绍原理等部分，实验视频以班级+姓名+作品名称进行命名。

Record experimental video, send it to hwflscienceking@126.com. The experimental video includes parts such as material preparation, experimental process, and introduction of principles. The experimental video is named after your class + your name + name of your work.

2. 科学老师会根据邮箱内收到的视频资料，经一学期的积累，学期末将评选属于世外的HWFL Science King实验小达人，颁发奖状，优秀作品还可参加省级科学影像项目竞赛，快快行动起来吧！

Based on the video materials received in the mailbox, the science teacher will select the HWFL Science King experiment master of HWFL at the end of the semester and award a certificate. Outstanding works can also participate in provincial-level scientific imaging project competitions. Let's act quickly!

文章转载自：【杭州上海世外学校】