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7、84831DIV.MsoFooter1FONT-SIZE:9pt;1AYOUT-GRID-MODE:char;FONT-FAMI1Y:TimesNewRomanDIV.MyFavJ321583484831P.pTEXT-JUSTIFY:inter-ideograph;FONT-SIZE:10.5pt;FONT-FAMI1Y:TimesNewRoman;TEXT-A1IGN:justifyDIV.MyFavJ3215834848311I.pTEXT-JUSTIFY:inter-ideograph;FONT-SIZE:10.5pt;FONT-FAMI1Y:TimesNewRoman;TEXT-A1
8、IGN:justifyDIV.MyFavJ321583484831DIV.pTEXT-JUSTIFY:inter-ideograph;FONT-SIZE:10.5pt;FONT-FAMI1Y:TimesNewRoman;TEXT-A1IGN:justifyDIV.MyFavJ321583484831DIV.Section1page:Section1一、实验器材:支架1个,有机玻璃槽1个,两头圆形的塑料圆柱体魔丸1个,钢珠1个二、实验设计:1 .如下图,将魔丸平放在有机玻璃槽的一端,抬起这头,观察魔丸怎样运动至另一端。反复屡次。现象:魔丸翻滚着运动到另一端。2 .将有机玻璃槽的中间架在支架上,用
9、手控制两端的上下,观察魔丸的运动。现象:魔丸翻滚着在玻璃槽内来回运动。三、探究问题:1 .魔丸为什么会像翻跟头似的运动而不是直接滑动下去?答:因为魔丸内部的钢珠使魔丸的重心前后移动,魔丸围绕着重心转动,所以魔丸像翻跟头似的运动。2 .猜测一下魔丸内部的结构会是怎样的?答:魔丸内部有一颗钢珠,直径差不多是魔丸长度的一半。3 .试分析魔丸运动时重心的变化以及能量的转换情况。答:当魔丸翻滚时重心不断地向魔丸前端移动。钢珠的重力势能不断地转化为魔丸翻滚的动能。4 .如果有机玻璃槽的内壁很光滑,魔丸的运动会是怎样?如果是很粗糙,又会是怎样?答:有机玻璃管内壁越粗糙,作用在魔丸上的摩擦力就越大,这样有助于魔丸翻滚。考前须知:不要将有机玻璃槽倾斜得过大接近竖直,以免圆柱体内的铅球砸坏玻璃槽的两端