上周星期五,老师在课堂上郑重地向同学们宣布,下节班队活动课时要在我们班上举行一场:“看谁的降落伞最后落地”的比赛,前三名的小组老师要奖励棒棒糖哦!
提起降落伞,我的脑海中立刻浮现出一幕,大大的降落伞从蓝蓝的天空悠闲下降的画面,但是却不知道怎么制作降落伞模型?怎样才能下降更慢?载着的物体的轻重是否与降落伞的下降速度有关?……我带着满脑子的疑问盼望着开始学习制作降落伞!
第二天,我来到同学家。我们首先在电脑里百度了怎样制作降落伞。了解到制作的要点是伞的面积要大,绳索的.长度要一致,而且悬挂的物品要轻一点,这样做出来的降落伞才能更慢的向下面降落。我们准备好了一堆材料:一个塑料袋;四根厘米长的粗线;一个夹子;一个剪刀;一个橡皮檫和透明胶等等。我们在电脑旁边看了很久的图,才悟出了一些小技巧。
首先,我们把一个塑料袋剪成圆形当做伞面,再用四段透明胶把线粘在伞的四个角落,而且要保证粘好以后的线段还是一样的长度,接着再把一个小物体(轻一点的,比如橡皮或小积木等)裹起来,最后用透明胶把小物体和线的底端粘在一起,这样一来,一个虽然简单但持久力超强的降落伞就制作而成了。简单吧?!
在盼望中迎来了这周五下午的班队活动课,老师让我们拿出自己制作的降落伞并开始比赛。我暗暗看了看周围同学制作的降落伞,发现其他同学做的降落伞下面挂的物体很大,很重,下降就会很快。我不禁有些洋洋得意,以为自己做的降落伞是最好的,我已经跃跃欲试了!每个同学都怀着激动的心情参加了比赛。经过几轮的比赛后,我们小组获得了第三名,也每人得到了棒棒糖哦!
其实,比赛的输赢并不重要,重要的是参与其中的乐趣!
This is my first week in ** Senior Middle School.Everything here is new for me.Our school is an old school but it`s very beautiful.I have 50 new classmates in my class.They`re all very excellent, I think, and I felt a little sad.Because I`m too common.But come to think of it,it`s a very good thing.I believe I can also be very excellent if I study with such excellent classmates.I didn`t know why Ms *** chose me to be the committee of study.But I know it`s a good chance for me to raise my ability.All I can do is do my best in the future.I am sure that Ms *** and my classmates can help me when I do something wrong. Because they`re all very kind.It`s a pleasure to work and study with them.I`m really very happy.I`m not an outstanding student in this class,but I can do the same thing like others.I believe I won`t make anyone disappointed.
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