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1、力和机械单元测试题三（参考答案）DIV.MyFav_1321585616904 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1321585616904 LI.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_13215
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6、LAYOUT-GRID-MODE: char; FONT-FAMILY: Times New RomanDIV.MyFav_1321585616904 DIV.MsoFooterFONT-SIZE: 9pt; LAYOUT-GRID-MODE: char; FONT-FAMILY: Times New RomanDIV.MyFav_1321585616904 A:linkCOLOR: blue; TEXT-DECORATION: underlineDIV.MyFav_1321585616904 SPAN.MsoHyperlinkCOLOR: blue; TEXT-DECORATION: und
7、erlineDIV.MyFav_1321585616904 A:visitedCOLOR: purple; TEXT-DECORATION: underlineDIV.MyFav_1321585616904 SPAN.MsoHyperlinkFollowedCOLOR: purple; TEXT-DECORATION: underlineDIV.MyFav_1321585616904 DIV.Section1page: Section1一、填空题1地球的吸引 重心2重力 摩擦力3成正比G=mg294 50kg4重 支持 地球 电梯 4005增大接触面的粗糙程度 增大摩擦 使接触面光滑 减小摩擦620 98 987省力 费 费力杠杆 省 动力臂 阻力臂 省力 省距离8竖直向下 80 竖直向上 80920 1010201120 4.51232 11二、单选题13C 14D 15B 16A 17B 18A，C，A 19C三、多选题20AC 21AB 22BD 23BD 24BC四、作图与实验题25略26略27（1）使用弹簧测力计测量超过其量程的物体。（2）物体所受的重力跟它的质量成正比。五、计算题28250N2948kg 470.4N3025cm 1N