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- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image8.jpeg" width="420.7pt" height="672.2pt" /></p>
- <p>天一大联考(原豫东、豫北十所名校联考)</p>
- <p>2014—2015学年高一年级阶段性测试(二)</p>
- <p>物理·答案</p>
- <p>1~12题,每小题4分,共48分。第1~8题只有一个选项符合题目要求,第9~12题有多个选项符合题目要求,全部选对的得4分,选对但不全的得2分,有选错的得0分。</p>
- <p>1.D 2.C 3.B 4.D 5.C 6.A 7.A 8.C 9.AC 10.AD 11.BD 12.BC </p>
- <p>13.答案:(1)0.200(4分) (2)1.20 (4分)</p>
- <p>14.答案:(1)可以避免弹簧自身重力对实验的影响(1分) 弹簧与桌面及绳子与滑轮间存在的摩擦会造成实验误差(1分) (2)<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image9.png" width="12.9pt" height="16.1pt" data-latex="$$" />(1分) 1 mm(1分) (3)<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image10.png" width="12.9pt" height="16.1pt" data-latex="$$" />(2分) </p>
- <p>(4)9.8(2分) 20(2分)</p>
- <p>15.本题考查牛顿第二定律、运动学公式、滑动摩擦力等内容,考查考生的综合分析能力。</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image11.png" width="90.75pt" height="76.6pt" />(1)这位同学达到最大加速度时,轮胎和地面之间的压力为0,以轮胎为研究对象,受力分析如图甲所示,由牛顿第二定律得<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image12.png" width="61.25pt" height="29pt" data-latex="$$" /> (2分) </p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image13.png" width="76.85pt" height="17.75pt" data-latex="$$" /> (2分) </p>
- <p>(2)该同学匀速运动时,对轮胎受力分析如图乙所示,由平衡条件可得</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image14.png" width="113.2pt" height="76.6pt" /><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image15.png" width="97.8pt" height="16.1pt" data-latex="$$" /> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image16.png" width="73.05pt" height="17.75pt" data-latex="$$" /> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image17.png" width="45.15pt" height="18.25pt" data-latex="$$" /> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image18.png" width="60.2pt" height="16.1pt" data-latex="$$" /> (1分) </p>
- <p>16.本题考查动摩擦因数的概念、滑动摩擦力大小的计算、力的合成与分解等内容,考查考生对物理概念的理解能力、图形转化的能力、抽象思维的能力。</p>
- <p>将小物块重力分解为平行于斜面向下的分力和垂直斜面的分力</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image19.png" width="68.8pt" height="15.05pt" data-latex="$$" /> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image20.png" width="70.95pt" height="16.1pt" data-latex="$$" /> (2分) </p>
- <p>当小物块做匀速直线运动时,物体在平行于斜面方向的受力情况如图所示,<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image21.png" width="99.05pt" height="92.4pt" />由平衡条件可得</p>
- <p> <img src="http://192.168.1.140:8800/ser_static\7195/word/media/image22.png" width="75.75pt" height="17.75pt" data-latex="$$" /> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image23.png" width="80.05pt" height="23.1pt" data-latex="$$" /> (2分)</p>
- <p>当小物块做匀减速运动时,一定有<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image24.png" width="38.15pt" height="17.75pt" data-latex="$$" /> (2分)</p>
- <p>故小物块开始运动的方向与水平力的夹角为45°(2分)</p>
- <p>联立可得<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image25.png" width="55.35pt" height="19.9pt" data-latex="$$" /> (1分)</p>
- <p>即<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image26.png" width="40.85pt" height="33.85pt" data-latex="$$" /> (2分)</p>
- <p>17.本题考查匀变速直线运动、追及相遇问题,意在考查考生的分析推理能力和综合运用能力。(1)设石头下滑时加速度大小为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image27.png" width="11.8pt" height="17.75pt" data-latex="$$" />,到坡底的速度为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image28.png" width="11.3pt" height="17.75pt" data-latex="$$" />,到坡底的距离为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image29.png" width="11.8pt" height="17.75pt" data-latex="$$" />,由匀变速直线运动公式可得: <img src="http://192.168.1.140:8800/ser_static\7195/word/media/image30.png" width="48.9pt" height="18.8pt" data-latex="$$" /> (3分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image31.png" width="49.95pt" height="17.75pt" data-latex="$$" />(1分) </p>
- <p>设石头到达坡底的时间为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image32.png" width="9.15pt" height="17.75pt" data-latex="$$" />,由匀变速直线运动公式:</p>
- <p><sub><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image33.png" width="51.05pt" height="31.15pt" data-latex="$$" /></sub> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image34.png" width="36.55pt" height="17.75pt" data-latex="$$" /> (1分) </p>
- <p>(2)设汽车的加速度为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image35.png" width="17.2pt" height="18.8pt" data-latex="$$" />,石头到达坡底后以大小为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image36.png" width="12.9pt" height="17.75pt" data-latex="$$" />的加速度匀减速运动,再经过时间<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image37.png" width="11.3pt" height="17.75pt" data-latex="$$" />与汽车的速度相等,设司机反应时间为T=1 s,则</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image38.png" width="117.15pt" height="18.8pt" data-latex="$$" /> (2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image39.png" width="40.85pt" height="30.65pt" data-latex="$$" /> (1分)</p>
- <p>设<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image37.png" width="11.3pt" height="17.75pt" data-latex="$$" />时间内石头在水平面上运动的距离为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image40.png" width="12.9pt" height="17.75pt" data-latex="$$" />,由匀变速直线运动公式可得</p>
- <p><sub><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image41.png" width="80.05pt" height="31.15pt" data-latex="$$" /></sub>(2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image42.png" width="53.75pt" height="30.65pt" data-latex="$$" /> (1分)</p>
- <p>设在<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image32.png" width="9.15pt" height="17.75pt" data-latex="$$" />+<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image37.png" width="11.3pt" height="17.75pt" data-latex="$$" />的时间内汽车前进的距离为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image43.png" width="7pt" height="13.95pt" data-latex="$$" />,由匀变速直线运动公式可得</p>
- <p><sub><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image44.png" width="95.1pt" height="31.15pt" data-latex="$$" /></sub>(2分)</p>
- <p><img src="http://192.168.1.140:8800/ser_static\7195/word/media/image45.png" width="46.75pt" height="30.65pt" data-latex="$$" /> (1分)</p>
- <p>因为<img src="http://192.168.1.140:8800/ser_static\7195/word/media/image46.png" width="29pt" height="18.25pt" data-latex="$$" />,所以运土车能够脱离危险 (2分)</p>
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