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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">同学们在学完弹簧测力计的相关知识后，自制了一个“橡皮筋测力计”，将橡皮筋不挂重物时下端对应位置标为零刻度线：挂1N重物时，下端对应位置标为1N；将这段距离等分为20格，每格表示0.05N。用此测力计测量物体重力时，发现测量值不准确。为了弄清其中的原因，同学们探究了橡皮筋的伸长与受到外力的关系。他们利用规格为0.05N的螺母若干、刻度尺、橡皮筋白板等进行了实验探究。不挂重物时，使橡皮筋下端与刻度尺的零刻度线对齐；挂不同重物时，橡皮筋下端对应不同的刻度值，作出标记，如图所示。</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（1）螺母挂在橡皮筋下静止时，受到橡皮筋的拉力 <u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">（选填“大于”“等于”或“小于”）它受到的重力。</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（2）同学们在橡皮筋下依次挂上个数不等的螺母，实验数据记录如下表。</span></span></span></span></span> <table class="Table" style="width:599px; margin-left:28px; border-collapse:collapse; border:none" width="599"> <tbody> <tr> <td style="border-bottom:1px solid black; width:107px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:1px solid black" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">试验次数</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">1</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">2</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">3</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">4</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">5</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">6</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">7</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">8</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">9</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">10</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">11</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:1px solid black; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">12</span></span></span></span></span></td> </tr> <tr> <td style="border-bottom:1px solid black; width:107px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:1px solid black" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">螺母个数n/个</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">1</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">2</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">3</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">4</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">5</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">6</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">7</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">8</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">9</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">10</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">11</span></span></span></span></span></td> </tr> <tr> <td style="border-bottom:1px solid black; width:107px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:1px solid black" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">螺母总重G/N</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.05</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.10</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.15</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.20</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.25</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.30</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.35</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.40</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.45</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.50</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0.55</span></span></span></span></span></td> </tr> <tr> <td style="border-bottom:1px solid black; width:107px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:1px solid black" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">刻度尺读数L/mm</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">5.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">11.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">20.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">30.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">45.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">60.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">75.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">90.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">110.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">133.0</span></span></span></span></span></td> <td style="border-bottom:1px solid black; width:41px; padding:2px 2px 2px 2px; border-top:none; border-right:1px solid black; border-left:none" valign="top"><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span lang="EN-US" style="line-height:150%"><span style="font-family:宋体">158.0</span></span></span></span></span></td> </tr> </tbody> </table> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">①分析实验数据可初步得出：橡皮筋下所挂重物越重，橡皮筋的伸长越 <u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">。</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">②进一步分析数据发现：每增加1个螺母时，刻度尺读数的变化量总体上是不同的，但中间有部分读数的变化量是相同的。若静止时橡皮筋下端对应刻度尺的70.0mm处，推测橡皮筋下所挂的物体重约为 <u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">N（结果保留两位小数）；若挂另一重物，静止时橡皮筋下端对应刻度尺的15.0mm处，此时 <u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">（选填“能”或“不能”）确定此物体的重。</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（3）同学们根据实验数据，用此橡皮筋重新制作一个刻度均匀的测力计，橡皮筋上端和刻度尺的位置保持不变。若使测力计的量程最大，零刻度线应标在刻度尺的<u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">mm刻度处，此测力计的最大量程为 <u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">。</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（4）同学们更换不同的橡皮筋进行探究，发现其它橡皮筋的特点均与此相似，他们由此总结出，若要用橡皮筋制作测力计，受橡皮筋材料影响，刻度均匀部分可测量范围 <u> </u></span></span><u> </u><u> </u><span style="line-height:150%"><span style="font-family:宋体">，整体上测量不准确，所以橡皮筋不适合做测力计。</span></span></span></span></span><br /> <img height="205" src="/uploads/meth/20210702/8a4e5c445325ff2aecd2c1ad3ee5d23e.png" width="134" />
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<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">解：（1）螺母静止，受到橡皮筋的拉力和它受到的重力二力平衡，大小相等；</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（2）分析表中数据可知，橡皮筋下所挂重物越重，橡皮筋所受拉力越大，刻度尺读数越大，即橡皮筋的伸长越长；</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">在第4次到第9次实验中，橡皮筋的伸长量与所受拉力成正比，设橡皮筋所受拉力为F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">x</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">时，伸长量为70.0mm，则有F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">x</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">：L</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">x</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">＝F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">6</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">：L</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">6</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">，即：F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">x</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">：70.0mm＝0.30N：60.0mm，</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">则F</span></span><sub><span style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:宋体">x</span></span></span></sub><span style="line-height:150%"><span style="font-family:宋体">＝0.33N；在其他次数实验中，橡皮筋的伸长量与所受拉力没有精确的数量关系，若静止时橡皮筋下端对应刻度尺的15.0mm处时，并不能确定此时对应的物体重；</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（3）在第4次到第9次实验中，橡皮筋的伸长量与所受拉力成正比，要用此橡皮筋制作一个刻度均匀的测力计，精确的测量范围应在其伸长量为30.0mm到90mm之间，测力范围为0～0.2N；</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">（4）用橡皮筋制作测力计，受橡皮筋材料影响，刻度均匀部分可测量范围小，整体上测量不准确，所以橡皮筋不适合做测力计。</span></span></span></span></span><br /> <span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">故答案为：（1）等于；（2）长；0.33；不能；（3）30.0；0～0.2N；（4）小。</span></span></span></span></span>
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本题考查了"探究弹簧测力计原理的实验"，属于"综合题"，熟悉题型是解题的关键。
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