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9、ONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1321583484831 DIV.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如图所示,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。反复多次。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,用手控制两端的高低,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猜想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。)注意事项: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)
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