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    被發射的小球300字日記

    時間:2015-03-20 13:15:42來源:未知 作者:天天日記
    請記住本站的網址:www.whkqy.com

    被發射的小球300字日記

    3月19日 星期四 晴
      星期三晚上,我和爸爸、媽媽一起在家做了一個實驗。實驗是這樣做的:先把材料擺好,而且要看看材料夠不夠,然后,就可以開始做了。
      第一歩,用透明塑料管把兩個針管接起來,然后推一下其中的一個針管活塞,另一個針管的活塞就會往后退。第二步,把其中一個活塞拔出來,往里面塞泡沫球,把另一個針管的活塞拉到頂端,然后推一下這個針管的活塞,小球就會一下子發射出去。
      我和媽媽玩了好多次,有幾回我們還把小球塞到針管里拿不出來了呢!不過幸好爸爸給我拿出來了。
      我發現了,如果活塞沒有被拉到頂端,針管里的空氣就會很少,小球就會拿不出來。如果拉到頂端的話,把活塞猛的往里推,空氣會被擠壓,小球自然就會被發射出去。讓小球發射出去的推力原來就是大氣壓力。
      這次做實驗我真開心!
     




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