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1、_-可编辑修改-六年级科学上册重点复习题科学六年级上册第一单元复习资料一、科学常识：1、在工作时，能使我们省力或方便的装置叫作机械。螺丝刀、钉锤、剪刀这些机械构造很简单，又叫做简单机械。2、像撬棍这样的简单机械叫做杠杆。它有三个点，用力的位置叫用力点，克服阻力的位置叫阻力点，支撑着杠杆，使杠杆能围绕转动的位置叫支点。3、杠杆尺平衡时，左边的钩码数乘以格数等于右边的钩码数乘以格数。4、当阻力点到支点的距离大于用力点到支点的距离时，杠杆费力。当阻力点到支点的距离等于用力点到支点的距离时，不省力也不费力。当阻力点到支点的距离小于用力点到支点的距离时，杠杆省力。_-可编辑修改-5、杆秤由秤杆、秤盘、秤
2、砣、提绳几部分组成。它也是一种杠杆类的工具。把秤砣悬挂位置作为用力点，那么杆秤是一个省力杠杆，所以“秤砣虽小压千斤”6、制作杆秤：先找到秤杆上的三点，定好位置。接着拴好阻力点和支点的细绳，挂好秤盘系上秤砣。再用挂钩码的方法，在秤杆上画出重量刻度。7、像水龙头这样，轮和轴固定在一起，可以转动的机械叫做轮轴。轮轴的作用：在轮上用力省力，在轴上用力费力；当轴相同时，轮越大越省力。生活中的轮轴：汽车方向盘、水龙头开关、起子、扳手、门锁把手。8、像旗杆顶部的滑轮那样，固定在一个位置转动而不移动的滑轮叫做定滑轮。可以随重物一起移动的滑轮叫做动滑轮。文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4
3、ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S
4、3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4
5、ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S
6、3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4
7、ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S
8、3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4
9、ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2文档编码:CW1S3T7I2Y7 HJ9X3D4C1T4 ZQ2Z1Y1E7T2_-可编辑修改-9、把动滑轮和定滑轮组合在一起使用，就构成了滑轮组。10、生活中的滑轮：定滑轮：旗杆顶部的轮子、窗帘上的轮子；动滑轮：工地上提重物的轮子、井口上提水的辘轳；滑轮组：起重机、升降衣架。10、像搭在汽车车厢上的木板那样的简单机械叫做斜面。11、斜面的坡度越小，在斜面上提升物体所用的力就小，斜面的坡度越大，在斜面上提升物体所用的力就大。螺丝钉的螺纹越密，旋进去就越省力。文档编码:CT9O4T1O1U6 H
10、T3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL
11、10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编
12、码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6
13、 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9
14、ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文
15、档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1
16、U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3_-可编辑修改-12、链条与两个齿轮啮合，起到传递动力而使自行车运动的作用。自行车的大齿轮带动小齿轮，转动速度变快，小齿轮带动大齿轮，转动速度变慢。（转速快，用力大；转速慢，用力小。）13、各种简单机械的比较：简单机械举例杠杆省力杠杆开瓶器、切刀、核桃夹、羊角锤(榔头）不省力也不费力跷跷板、订书机、
17、天平费力杠杆筷子、镊子、钓鱼杆轮轴水龙头、门把手、方向盘、扳手拧螺帽、螺丝刀拧螺丝斜面盘山公路、大桥引桥、螺丝钉、刀刃、斧头、楼梯、钉子的钉尖14、写出各类型滑轮的作用。滑轮类型作用滑动滑轮省力文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2
18、P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T
19、1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8
20、H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5
21、D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O
22、4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2
23、Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3_-可编辑修改-轮定滑轮改用用力的方向滑轮组既省力又改变用力方向15、
24、自行车上的各部分应用了哪种简单机械？应用机械的位置应用机械的类型应用机械的位置应用机械的类型车把手轮轴车上的螺丝钉斜面刹车杠杆后轴上的齿轮和后轮轮轴大齿轮和小齿轮轮轴后架上的弹簧夹杠杆车铃的按钮杠杆脚蹬前轮、滑轮前轮滑轮脚蹬和齿轮轮轴科学六年级上册第二单元复习资料一、科学知识：1、很多的房屋和桥梁都是依靠直立的材料(柱子)和横放的材料(横梁)支撑住的。它们受压时，横梁比柱子容易弯曲和断裂，所以，如何增强横梁抗弯曲能力是建筑上很重要的问题。2、把薄板形材料弯折成“V”“L”“U”“T”或“工”字等形状，实际上都是减少了材料的宽度而增加了材料的厚度。减少材料宽度虽然降低了一些抗弯曲能力，但增加了厚
25、度，就大大增强了材料的抗弯曲能力。材料的宽度越宽，抗弯曲能力越强；材料的厚度越厚，抗弯曲能力越强。材料的宽度和厚度中，厚度更多地影响材料抵抗弯曲的能力。瓦楞纸 中间的纸被折成了波浪形，增加了纸的厚度，从而提高了纸板的抗弯曲能力。3、拱形受到压力时，能把压力向下和向外传递给相邻的部分。拱形受到压力时会产生一个向外推的力，能抵住这个力，拱就能承载很大的重量。4、圆顶形可以看成拱形的组合，它具有拱形承载受压力大的优点，而且不产生向外推的力。球形在各个方向上都是拱形，这使得它比任何形状都坚固。文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1
26、U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y
27、9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P
28、3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1
29、O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H
30、9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D
31、2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4
32、T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3_-可编辑修改-5、生物体中的拱形：人的头骨、拱形的肋骨、足拱、管状的手臂骨、腿骨，贝壳、乌龟的壳、鸡蛋、接近圆形的水果。生活中的拱形：植物的杆、茎、果实，拱门，拱窗，拱桥。6、骨架式的构造叫做框架结构。用框架结构可以建起很高的建筑而花费的材料却很少，框架结构中，三角形框架比四边形框架更加稳固，四边形框架容易变形。三角形框架 受到外力时，总是能够通过三根杆的推拉达到内力与
33、外力的平衡。在四边形框架 中加一根斜杆，就会变得稳固。因为加了斜杆后，当框架受到外力时，斜杆会产生拉力，使框架达到内力与外力的平衡，从而不易变形。7、不容易倾倒的塔结构往往是上小下大，上轻下重的。8、框架铁塔结构特点：上小下大、上轻下重、采用了大量的三角形框架结构、抗风能力强。9、常见的桥梁结构类型有梁桥、拱桥、拉索桥和浮桥。桥面在拱下方的拱桥，桥板可以拉住拱足，抵消拱向外的推力。桥面被水平方向的力拉紧，还增加了桥面的抗弯曲能力。桥面在拱上方的拱桥，一字形桥板和两个矮梯形消除了拱的外推力，使拱桥更加稳固。10钢缆能能承受巨大的拉力，人们用它们建造的钢索桥，大大增加了桥的跨越能力。11钢索桥的结
34、构：由钢缆、桥塔、桥面组成。钢缆是桥承重的主要构件，桥塔是支承钢缆的主要构件，桥塔是支承钢缆的主要构件。从结构上看是吊桥，即桥面被钢缆吊起来。钢索桥的功能：跨度很大。12我知道的钢索桥：江阴大桥，夷陵长江大桥，美国跨海峡大桥。文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z
35、8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W
36、5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9
37、O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q
38、2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P
39、1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:C
40、T9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3_-可编辑修改-13、设计桥要考虑：纸
41、这种材料的特性；纸的承受力有什么时候特点；选择形状和结构。用什么方法增强纸的抗弯曲能力。科学六年级上册第三单元复习资料一、科学知识：1、1820 年，丹麦科学家奥斯特把通电导线靠近指南针，发现通电导线可以产生磁性，为人类大规模利用电能打开了大门。2、用线圈和指南针可以做成电流检测器，检测电池中有没有电：把电池接入线圈，靠近指南针，指南针发生偏转，电池就有电。3、由线圈和铁芯组成的装置叫电磁铁。电磁铁只有通电时才具有磁性。做电磁铁实验时，因为用的导线较短，这个电磁铁是很耗电的，不要把它长时间接在电池上。4、电磁铁有南北极。南北极与线圈缠绕的方向、电池正负极的接法有关。5、电磁铁的磁力大小是可以改
42、变的，大小与串联电池的数量、线圈的圈数、铁芯的大小、导线的粗细等有关。圈数少磁力小，圈数多磁力大：电池少则磁力小，电池多则磁力大；。6、电动机由磁铁、绕着线圈的铁芯、换向器、电刷组成。换向器的作用是接通电流并转换电流的方向。小电动机在转动的过程中，电刷依次接触换向器的三个金属环，通过转子线圈的电流方向就会文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8
43、H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5
44、D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O
45、4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2
46、Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1
47、W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT
48、9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3
49、Q2Z8H9Y9 ZL10P1W5D2P3_-可编辑修改-自动改变。7、电动机是用电产生动力的机器。虽然大小悬殊、用途各异，但电动机的工作的基本原理相同：用电产生磁，利用磁的互相作用转动。8、电能使各种用电器做各种运动、发光、发声、发热我们把电具有的这种能量，叫电能。9、能量有电能、热能、光能、声能等不同的形式。和运动有关的物体具有的能量叫机械能。燃料、食物和一些化学物质中储存的能量叫做化学能。任何物体工作都需要能量。如果没有能量，自然界就不会有运动和变化，也不会有生命了。各种各样的电池：干电池（普通电池和钮扣电池）化学能转化成电能；太阳能电池太阳能转化成电能，不能储存电能，只能即时使用；蓄电
50、池放电时把化学能变成电能，充电时把电能转化成化学能。用化学能的形式把电能储存起来。文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O1U6 HT3Q2Z8H9Y9 ZL10P1W5D2P3文档编码:CT9O4T1O