八年级物理上册2.3探究物质的密度练习2新版北师大版20190122435.doc

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1探究物质的密度 1一瓶水倒掉一部分,则剩余部分的水的质量_,体积_,密度_2同种质量,它的质量跟体积成_比,其比值是_的,不同物质的质量与体积的比值一般是_可见,质量与体积的比值反映了物质的_,物理学中用_表示物质的这种_3某种物质的_的_叫做这种物质的密度,其国际单位是_,读作_4完成下列单位换算(1)1m 3_dm 3_cm 3 (2)6mL_cm 3_m 3(3)1.010 3kg/m3_g/cm 3 (4)13.6g/cm 3_kg/m 35如图是某种物质的质量和体积关系的图象,由图象可知,这种物质的密度是_kg/m 36有一金属块质量是 386g,体积是 20cm3,这种金属的密度是_kg/m 3;如果将它截去一半,剩余部分的密度是_kg/m 3答案1答案:变小,变小,不变点拨:质量是物体所含物质的多少,水倒掉一部分后,水变少了质量变小,体积变小而密度是物质的特性,水虽然少了,但水这种物质没变,故密度不变2正,不变,不同,特性,密度,特性3单位体积,质量,kg/m 3,千克每立方米4(1)10 3,10 6(2)6,610 6 (3)1(4)13.610 351.6710 3点拨:由图象可知,当物质的体积 cmV时,其对应的质量为 10g,则333 kg/1067.1.g/c6cm0V6解: 33 /.9c28截去一半,密度不变答案: 310.9;30.19

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