《功和机械能》单元检测题三（参考资料）

功和机械能单元检测题三（参考资料）DIV.MyFav_1326680400369 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1326680400369 LI.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1326680400369 DIV.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1326680400369 P.MsoHeaderBORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 0cm; FONT-SIZE: 9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: char; COLOR: windowtext; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; FONT-FAMILY: Times New Roman; TEXT-ALIGN: centerDIV.MyFav_1326680400369 LI.MsoHeaderBORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 0cm; FONT-SIZE: 9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: char; COLOR: windowtext; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; FONT-FAMILY: Times New Roman; TEXT-ALIGN: centerDIV.MyFav_1326680400369 DIV.MsoHeaderBORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 0cm; FONT-SIZE: 9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; LAYOUT-GRID-MODE: char; COLOR: windowtext; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; FONT-FAMILY: Times New Roman; TEXT-ALIGN: centerDIV.MyFav_1326680400369 P.MsoFooterFONT-SIZE: 9pt; LAYOUT-GRID-MODE: char; COLOR: windowtext; FONT-FAMILY: Times New RomanDIV.MyFav_1326680400369 LI.MsoFooterFONT-SIZE: 9pt; LAYOUT-GRID-MODE: char; COLOR: windowtext; FONT-FAMILY: Times New RomanDIV.MyFav_1326680400369 DIV.MsoFooterFONT-SIZE: 9pt; LAYOUT-GRID-MODE: char; COLOR: windowtext; FONT-FAMILY: Times New RomanDIV.MyFav_1326680400369 EMCOLOR: #cc0000; FONT-STYLE: normalDIV.MyFav_1326680400369 P.MsoPlainTextTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-ALIGN: justifyDIV.MyFav_1326680400369 LI.MsoPlainTextTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-ALIGN: justifyDIV.MyFav_1326680400369 DIV.MsoPlainTextTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; COLOR: windowtext; FONT-FAMILY: 宋体; TEXT-ALIGN: justifyDIV.MyFav_1326680400369 PFONT-SIZE: 12pt; MARGIN-LEFT: 0cm; COLOR: black; MARGIN-RIGHT: 0cm; FONT-FAMILY: 宋体DIV.MyFav_1326680400369 SPAN.CharChar1FONT-FAMILY: 宋体DIV.MyFav_1326680400369 DIV.Section1page: Section1一、选择题（本题共15小题，每小题3分，共45分。每小题只有1个选项符合题意，把正确选项前面的字母填在题干后的括号内，选对的得3分，多选、错选均不得分）题号123456789101112131415答案ABBBCACABBADADB二、填空题（本题21空，每空1分，共21分）16大 小172018减小 减小19罐子从斜面滚下后又返回 重力势能、动能与弹性势能的相互转化20弹性势能 动能 重力势能21重力势能（势能、机械能） 动能（或机械能）22500 150232.0 1.8 902480 变大255J 80三、实验探究与设计题（第26小题7分，第27小题11分，共18分）26（1）大；（2）质量。控制了质量不同的小球滑到水面上时具有相等的速度；（3）速度。质量一定时，小球的速度越大动能越大。27（1）匀速 左；（2）60 3.0； （3）A 在其它条件相同时，斜面的倾斜程度越大，斜面的机械效率越高（或大）；或在其它条件相同时，斜面的机械效率与斜面的倾斜程度有关；（4）控制变量法；（5）斜面的粗糙程度、木板的长度、拉木块速度、木板的面积等（合理均可得分）四、计算题（第28 小题8分，第29小题8分，共16分）28（1）车胎能承受的最大压力是。则该