题目内容
用落体法验证机械能守恒定律的实验中,
①(2分)运用公式
验证机械能守恒定律,所选择的纸带第l、2点间的距离应接近 mm。
②(8分)若实验中所用重锤的质量m
1kg,打点纸带如图所示,打点时间间隔为0. 02s,图中O为第一个点,测出A、B、C、D距O点的距离如图所示,则记录B点时,重锤的速度vB= m/s,重锤的动能EK= J,从开始下落起至B点重锤的重力势能的减小量是 J,由此可得出的结论是 。(
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511162814484.jpg)
③(4分)根据纸带算出相关各点的速度
,量出下落的距离h,则以
为纵轴、h为横轴画出的图像应是图中的哪个![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511165775629.jpg)
①(2分)运用公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151115969798.png)
②(8分)若实验中所用重锤的质量m
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151115985164.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151116203666.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511162814484.jpg)
③(4分)根据纸带算出相关各点的速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151116406262.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151116484453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511165775629.jpg)
①2 ②0.59 , 0.174 , 0.176 , 误差允许的范围内机械能守恒 ③C
试卷分析:根据自由落体运动,以及打点计时器打点间隔0.02s,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511165931040.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151116655603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151116796795.png)
点评:此类题型考察机械能守恒定律,考察打点计时器的使用
![](http://thumb2018.1010pic.com/images/loading.gif)
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