神奇的纸讲课教案.pptx

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1、shenqidezhi神奇的纸一年级三班xuyaocailiao需要材料1、彩纸二张2、铅笔一支3、硬币若干4、纸杯两个5、双面胶buzhou步骤：jiangzhizhankaipingpuzaiqiangshang1、将纸展开，平铺在墙上。yongqianbidecemianxunsudezaizhishangmocajixiahou2、用铅笔的侧面迅速地在纸上摩擦几下后zhijiuxiangnianzaiqiangshangyiyangdiaobuxialaile纸就像粘在墙上一样掉不下来了。yuanlishuoming原理说明mocaqianbishizhidaidian1、摩擦

2、铅笔，使纸带电。daidiandezhibeixidaoleqiangshang2、带电的纸被吸到了墙上。dangwulidekongqiganzaoruguonibazhicongqiang3、当屋里的空气干燥，如果你把纸从墙shangjiexialaihaikeyitingdaojingdiandepipasheng上揭下来，还可以听到静电的劈啪声。xiangyixiang想一想haiyoushengmowupinnengbuyongnianhejiliyongjingdian还有什么物品能不用粘和剂，利用静电zhanzaiqiangshang粘在墙上?ermoaobiandali

3、shi二、秒变大力士tongyangdeyizhangzhizaixingzhuangfashengbianhuahoutajiu同样的一张纸在形状发生变化后，它就nengchengzaigengduodedongxibianchengledalishi能承载更多的东西变成了大力士！caozuobuzhou操作步骤yizhangkazhixuankongbangzailianggezhibeishangzhishangzhineng1、一张卡纸悬空放在两个纸杯上，纸上只能fanglianggeyingbizhijiuxiachen放两个硬币，纸就下沉。bazhizhechengyuan

4、tongxingzhuangjiazaixiangtongdeliang2、把纸折成圆筒形状，架在相同的两gezhibeishangyuantongdezhilinengfangduomeiyingbi个纸杯上，圆筒的纸里能放多枚硬币。yuanlishuoming原理说明Yuantongdezhibipingzhengdezhichengzaideyingbigeshuduo圆筒的纸比平整的纸承载的硬币个数多。zheshiyingweiyizhangzhinengchengshouduodadeyalizhuyaoqu这是因为一张纸能承受多大的压力,主要取jueyuzhizhangsh

5、oulishidewanjuyijishoulimianji决于纸张受力时的弯矩以及受力面积。xiangyixiang想一想zenyangbianhuazhezhangzhishizhishangyekeyifanghengduode怎样变化这张纸，使纸上也可以放很多的yingbi硬币？科技放飞梦想，快乐伴我成长谢谢观赏