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    作文 > 小學作文 > 三年級 > 觀后感 > 流動科技館觀后感_1200字

    流動科技館觀后感_1200字

    2018-04-18 09:56:11

      2018年1月20日,媽媽帶我和妹妹來到榆中縣博雅小學流動科技館展覽現場。一進博雅小學門口,灰白相間嶄新又典雅的三棟教學樓映入我們的眼簾。登記之后,我猜想展覽館一定在教學樓里面吧!倒底應該去哪一棟教學樓參觀科技展呢?我去了正對大門口的教學樓,發現一樓大廳居然有一臺飲料機,感覺博雅小學很現代!繼續往里走,我發現有幾位裝修工人在粉刷墻壁,我這才意識到走錯了!于是我跑向左邊的那棟教學樓,發現科技展覽不在一樓,卻在二樓!
      二樓有兩處科技展,我在左側展廳中還做了兩個實驗呢!第一個是“風力發電”,我用吹風機一吹那個小風扇,小風扇下面的燈就亮起來了,這不就是風力發電嗎?今天終于親眼見到了!第二個實驗項目就是“記憶彈簧”,我用吹風機的熱風來吹記憶荷花和彈簧,我發現一吹它們的內部,荷花和彈簧就收縮了起來;一吹外部,荷花和彈簧就伸展了起來,這是怎么回事呢?原來,當熱風來加熱金屬的固體表面,金屬的形狀就會慢慢變化。我明白了這個原理后心里感到樂滋滋的!突然發現有一個展位人少一點,我趕緊湊過去,抬頭一看,展板上寫著“圓球表面積的計算原理”,我把這個大鐵球往下一翻,水就注入了四個圓球里面,水剛好裝滿了四個圓球。我又往上一翻,水也剛好裝滿了大鐵球部分。哦!我發現大鐵球的表面積不好算,人們就想辦法用四個圓球的表面面積來等換一個大鐵球的表面面積。
      明白了球體表面積的算法后,我又來到“磁鐵加速原理”處,看到用磁鐵做成的封閉圓形軌道中有一個鐵球,我讓鐵球開始滾動時,鐵球沒有滾到別的地方,而是漸漸加速了起來,最后我都看不清鐵球到哪兒了,鐵球滾的形狀就像軌道一樣大了,原來這就是加速原理呀!
      隨著參觀人群的移動,我來到了“哪個滾得快”展位,發現有兩個圓體的玻璃球,他們的路線都是一樣的,形狀大小也都一樣,可是它們身體里裝的五個小鐵球位置不一樣,一個玻璃球里面的五個小鐵球是擠在中間的,另一個是散布在周圍的。他們滾起來的速度大不一樣:鐵球在中間的玻璃球比鐵球在四周的玻璃球速度快的多。反復操作了幾次后,這個原理我終于搞明白了!它就像巴黎演員旋轉的時候他把腳伸直了,就轉得慢一點,可是把腳盤起來就轉的速度快多了。
      最后一個是我最喜歡的科學實驗項目!有一只鯊魚張大了嘴巴,我把一只手放進去,鯊魚的眼睛一亮,咔嚓一嘴咬下去,我怕被咬,就趕緊把手伸了出來,結果我的反應速度記錄是三毫秒,媽媽也試了一下,可是她還沒來得及縮回手就被鯊魚咬住了,媽媽還裝著慘叫一聲!媽媽的反應速度記錄是五秒鐘,這說明媽媽的神經反應比我差多了,我的心里頓時有一種說不出的自豪感!
      我一出博雅小學的校門。我就感覺到科技的神奇力量和奇妙無比!科技給我們帶來了無限的思考和探索,給我們創造了無限可能,我喜歡。

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