压强和浮力学习指导.doc
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15、mDIV.MyFav_1324281080711 ULMARGIN-BOTTOM: 0cm压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌赣彤途聂磅看
16、贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜【知识要点】压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌赣彤途聂磅
17、看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜本章的重点是压强的计算、大气压强的应用和浮沉条件。考点还有:压力的作用效果与什么因素有关、增大压强和减小压强的方法、液体压强与流速的关系、阿基米德原理及其探究过程等。难点是正确理解压强的定义、浮力的有关计算及浮沉条件的应用。压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times Ne
18、w Roman; TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌赣彤途聂磅看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜1增大(减小)的压强的方法压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY:
19、Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌赣彤途聂磅看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜从影响压强的因素看,无论是增大压强还是减小压强,方法有:要么改变压力,要么改变受力面积,或同时改变这两个因素。但在实际问题中,要根据问题的实际来确定改变和如何改变影响压强的因素。如坦克的两条履带做得宽且长,这是因为坦克的主体重(壳体、发电机、油料、武器设备等)不能减小,对地面的压力不能改
20、变,因此只能采取增大受力面积的措施来减小它对地面的压强,以使坦克在各种地面上都能行驶,适应作战的要求。压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌
21、赣彤途聂磅看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜2正确理解液体的压强压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考
22、贴玻倡母菌赣彤途聂磅看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜由于液体受到重力和具有流动性,所以液体内部向各个方向都有压强。同种液体在同一深度,向各个方向的压强相等。液体压强的大小,只决定于液体的密度和深度。深度,是指液体内某处到液面的竖直距离。压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; T
23、EXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌赣彤途聂磅看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜3大气压的应用压强和浮力学习指导第 页压强和浮力学习指导 DIV.MyFav_1324281080711 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman;
24、 TEXT-ALIGN: justifyDIV.MyFav_1324281080711 LI.MsoNormalTEXT-JUSTIFY: inter-敛燃松研祖磕廊虾寡膨适裂考贴玻倡母菌赣彤途聂磅看贫稚砷锡为忧挑曼袒爷诧层吓德赵南有款草络妹斧衫琉乙峰狈靛豆史善背乔某能驭蝎殊声菜大气压得到人们的广泛应用。应用大气压,要有一个首先排除容器内空气的过程,使其内外存在压强差。如用吸管喝饮料时,首先得把管中的空气吸出去(使管内大气压很小),大气压将瓶中的饮料压入管内至口中。在墙壁上安装吸盘式挂衣钩时,首先得把皮碗中的空气挤出(使皮碗内大气压很小),大气压将皮碗压在墙壁上。在回答有关方面的问题时,尤其要
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