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齿轮的作用主要结构:齿轮、链条。各种各样的齿轮这些齿轮有什么共同特点吗?圆形边缘有齿中间有轴可以转动nanning.99114.com/pifa-107/nanning.99114.com/pifa-117/nanning.99114.com/pifa-115/nanning.99114.com/pifa-116/liuzhou.99114.com/pifa-128/liuzhou.99114.com/pifa-118/liuzhou.99114.com/pifa-125/liuzhou.99114.com/pifa-135/liuzhou.99114.com/pifa-131/liuzhou.99114.com/pifa-106/liuzhou.99114.com/pifa-136/liuzhou.99114.com/pifa-113/liuzhou.99114.com/pifa-140/liuzhou.99114.com/pifa-109/liuzhou.99114.com/pifa-103/liuzhou.99114.com/pifa-137/liuzhou.99114.com/pifa-129/liuzhou.99114.com/pifa-133/liuzhou.99114.com/pifa-124/liuzhou.99114.com/pifa-126/liuzhou.99114.com/pifa-102/liuzhou.99114.com/pifa-127/liuzhou.99114.com/pifa-110/liuzhou.99114.com/pifa-114/liuzhou.99114.com/pifa-119/liuzhou.99114.com/pifa-130/liuzhou.99114.com/pifa-123/liuzhou.99114.com/pifa-122/liuzhou.99114.com/pifa-101/liuzhou.99114.com/pifa-105/liuzhou.99114.com/pifa-104/liuzhou.99114.com/pifa-107/liuzhou.99114.com/pifa-117/liuzhou.99114.com/pifa-115/liuzhou.99114.com/pifa-116/guilin.99114.com/pifa-128/guilin.99114.com/pifa-118/guilin.99114.com/pifa-125/guilin.99114.com/pifa-135/guilin.99114.com/pifa-131/guilin.99114.com/pifa-106/guilin.99114.com/pifa-136/guilin.99114.com/pifa-113/guilin.99114.com/pifa-140/guilin.99114.com/pifa-109/guilin.99114.com/pifa-103/guilin.99114.com/pifa-137/guilin.99114.com/pifa-129/guilin.99114.com/pifa-133/guilin.99114.com/pifa-124/guilin.99114.com/pifa-126/guilin.99114.com/pifa-102/guilin.99114.com/pifa-127/guilin.99114.com/pifa-110/guilin.99114.com/pifa-114/guilin.99114.com/pifa-119/guilin.99114.com/pifa-130/guilin.99114.com/pifa-123/guilin.99114.com/pifa-122/guilin.99114.com/pifa-101/guilin.99114.com/pifa-105/guilin.99114.com/pifa-104/guilin.99114.com/pifa-107/guilin.99114.com/pifa-117/guilin.99114.com/pifa-115/guilin.99114.com/pifa-116/wuzhou.99114.com/pifa-128/wuzhou.99114.com/pifa-118/wuzhou.99114.com/pifa-125/wuzhou.99114.com/pifa-135/wuzhou.99114.com/pifa-131/wuzhou.99114.com/pifa-106/wuzhou.99114.com/pifa-136/wuzhou.99114.com/pifa-113/wuzhou.99114.com/pifa-140/wuzhou.99114.com/pifa-109/wuzhou.99114.com/pifa-103/wuzhou.99114.com/pifa-137/wuzhou.99114.com/pifa-129/wuzhou.99114.com/pifa-133/wuzhou.99114.com/pifa-124/wuzhou.99114.com/pifa-126/wuzhou.99114.com/pifa-102/wuzhou.99114.com/pifa-127/wuzhou.99114.com/pifa-110/wuzhou.99114.com/pifa-114/wuzhou.99114.com/pifa-119/wuzhou.99114.com/pifa-130/wuzhou.99114.com/pifa-123/wuzhou.99114.com/pifa-122/wuzhou.99114.com/pifa-101/wuzhou.99114.com/pifa-105/wuzhou.99114.com/pifa-104/wuzhou.99114.com/pifa-107/wuzhou.99114.com/pifa-117/wuzhou.99114.com/pifa-115/wuzhou.99114.com/pifa-116/beihai.99114.com/pifa-128/beihai.99114.com/pifa-118/beihai.99114.com/pifa-125/标准齿轮的要求:做齿轮材料要有一定的硬度齿轮必须是圆形的组合在一起的齿轮齿的大小要一致齿轮的固定轴必须在中心我能行组合你们自己做的齿轮,转一转,你有什么发现吗?合作探究:利用齿轮模型,探究齿轮的作用。1.设计实验方案。小组讨论:齿轮有什么作用?打算怎样组装齿轮进行研究。2.汇报实验方案3.进行实验,探究齿轮的作用。按照刚才的实验方案去研究,在研究过程中,仔细观察实验现象,做好记录。汇报交流:展示小组的研究成果•相邻的齿轮转动的方向相反传递动力改变转速改变转动方向思考:你还见过哪些运用齿轮的机械呢?链条传动和齿轮传动相比的缺点:链条的磨损变形速度更快,使用噪音更高,传动功率和传动速度较低。齿轮传动和链条传动在生活中分别适用于什么地方?学以致用:闹钟的时针、分针、秒针在同一根轴上,都是顺时针方向转动,需要用几个齿轮,怎么组合就能做到?1、小组内先猜一猜。2、打开闹钟后盖看一看和小组的想法一样吗?为什么?
本文标题:《齿轮的作用》ppt课件
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