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2022年9月23日,是中国第五个“农民丰收节”,学校以“庆丰收,迎盛会”为主题,隆重开展了丰富多彩的庆祝活动,如:“走进丰收节”观看《庆丰收,迎盛会》的微课视频、“果实累累展丰收”、“播下秋天的希望”、“童心绘丰收”、“秋分到,蛋儿俏”、“秋分诗词及谚语”、“地味天香庆丰年”等等。
其中“秋分到,蛋儿俏”,是学校科学科组组织全校学生做“竖蛋”试验的活动,要求同学们准备好一个完好的、新鲜的生鸡蛋,在科学课堂上进行“竖蛋达人赛”,并拍比赛视频。老师还布置同学们与家人一起,在家做“竖蛋”试验,用照片或视频记录试验过程,共享亲子探究的欢乐。
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大部分同学们都能配合做“竖蛋”的试验,有些同学还把鸡蛋壳描绘出五彩斑斓的画,非常漂亮,同学们觉得“竖蛋”的试验既有意义又有趣,纷纷接受挑战,有很多同学“竖蛋”成功了,活动开展得很成功,既培养了同学们的细心、耐心、恒心,又培养了同学们勇于探索、不放弃、不服输的精神。
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我国民间有句俗语:“秋分到,蛋儿俏”,民间有秋分习俗“竖蛋”习惯, 秋分“竖蛋”习俗富有趣味性和娱乐性。据史料记载,在4000年前,中国就有了秋分这天“竖蛋”的传统,我国很多地方都在这天举行“竖蛋”的游戏或比赛。
“竖蛋”试验方法简单易行:
选择一个光滑匀称、刚生下四五天的新鲜鸡蛋,轻轻地在桌子上把它竖起来。
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秋分鸡蛋比较容易立起的原因:
原理一:秋分这一天,太阳直射在赤道上,南北半球昼夜平分,白天和夜晚时间一样长,都是12小时。呈66.5度倾斜的地球地轴与地球绕太阳公转的轨道平面处于一种力的相对平衡状态,同时地球的磁场也相对平衡,因此蛋的站立性最好。
原理二:蛋壳上有许多高0.03毫米左右的突起,三个突起可构成一个三角形的平面,如果使鸡蛋的重心线通过这个三角形,就可以实现竖蛋了。
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“竖蛋”试验可不是一件容易成功的事情哦,要讲究方法。
要点一:挑鸡蛋。
首先要挑选一头大一头小的鸡蛋,立蛋时将大头朝下,这样重心会比较低,就像不倒翁一样,容易保持平衡。
要点二:寻找支持面。
找到合适的支持面,蛋壳三个突起可构成一个三角形的平面,鸡蛋重力作用线能经过这个平面,鸡蛋就能站立起来。
要点三:手要稳。
因为生鸡蛋里的蛋黄位置也会影响鸡蛋的站立情况,所以立鸡蛋的手要尽量保持不动,让蛋黄可以慢慢沉淀到鸡蛋下部,这样重心能足够低,容易使鸡蛋保持平衡。
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学校通过中国农民丰收节以及秋分节气系列活动,传承中国优秀传统文化,让学生参与到实践活动中来,真正感受“谁知盘中餐,粒粒皆辛苦”的深远涵义,学会珍惜和感恩;各种活动让同学们感受“金秋果硕,五谷丰登”带来的美好和喜悦,引导学生懂得劳动最光荣,劳动最崇高,劳动最伟大,劳动最美丽的道理,培养学生尊重劳动,崇尚劳动,热爱劳动的精神。
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撰稿及图文编辑:莫 霞
供图:科学科组教师
审核:张明