华语世界最优秀的儿童科学读物——小牛顿正式开讲咯!这里每天都有鲜活的科学小故事。您也可以下载我们的云端科学大百科——小牛顿APP,在科学乐园里愉快畅游,或者作为随身工具书也是极好的。
Publishes | Daily | Episodes | 99 | Founded | 10 years ago |
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Language | Categories | Kids & FamilyCoursesEducation |
【新人送45元VIP】看完整动画书,快点击页面底部下载小牛顿APP!
一般雌蜻蜓的体色比雄蜻蜓淡些。有些种类的蜻蜓,雌雄体色完全不同。
蜻蜓的飞翔方式非常自由,它能在飞行途中突然改变方向,也能将前翅与后翅相互拍动,或是像滑翔机一样乘风飞翔。
【新人送45元VIP】快点击页面底部下载“小牛顿”APP!
五月里,当我们到野外郊游时,常常可水边看到一只只蜻蜓,挥动着透明的小翅膀,成群的在空中盘旋,模样儿像极了一架架小飞机呢!
【新人送45元VIP】快点击页面底部下载“小牛顿”APP!
我家住在靠近郊外的地方,房子外面有一片荒地。荒地上有一片青绿,长满着各式各样的植物。许多野花、野草生长在其中,不论刮风或下雨,它们总是充满了生命力。我喜欢和朋友一块去野地上游玩,身边的野花、野草可以变出很多把戏,常带给我们很多意外的惊喜。
【新人送45元VIP】快点击页面底部下载“小牛顿”APP!
我家住在靠近郊外的地方,房子外面有一片荒地。荒地上有一片青绿,长满着各式各样的植物。许多野花、野草生长在其中,不论刮风或下雨,它们总是充满了生命力。我喜欢和朋友一块去野地上游玩,身边的野花、野草可以变出很多把戏,常带给我们很多意外的惊喜。
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啥時候要更新?
直到目前,力学物理学工程力学等书籍和教科书,对惯性力概念没有一个明确统一观念,这说明我们没有充分认识理解牛顿三大定律。我的观念:当物体m受到某种形式的力F时,物体就会产生加速度a,之间关系是F=ma,这就是牛顿第二定律。但是如何正确理解该定律,当物体受到力(引力、电磁力),该物体就产生加速度a(相对惯性系统),这是会受到惯性(场)系统的力,这个力就是惯性力,其大小等于-ma,即牛顿第二定律公式变为F+(-ma)=0。惯性力对应的能就是物体动能,没有惯性力物理量也就没有动能这个物理量。惯性力作功大小就是动能变化大小。动量守恒就体现动能与其它能转化值的绝对确定性,也说明惯性力也遵守第三定律。单个物体的动能变化值是相对的,只有二个以上物体相互作用及转化具有绝对性,这符合德国女数学家诺特定理。胡锡兴20年3月22日
内容不全怎么听??第一级有上没下,第二集没有 第三集有,需要改进。不完整的音频是摆着看的么?
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Apple Podcasts | #248 |
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【小牛顿】科学开讲咯(6-12岁) launched 10 years ago and published 99 episodes to date. You can find more information about this podcast including rankings, audience demographics and engagement in our podcast database.
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