题目内容
一打点计时器固定在斜面上某处,一小车拖着穿过打点计时器的纸带从斜面上滑下,如图所示.图是打出的纸带的一段.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020382347794.jpg)
①已知打点计时器使用的交流电周期为T,利用图(b)给出的数据(用字母表示)可求出小车下滑的加速度a=________________.
②为了求出小车与斜面间的动摩擦因数
,还需要测量的物理量有_______________.
用测得的量及加速度a表示小车与斜面间的动摩擦因数
=_______________.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020382347794.jpg)
①已知打点计时器使用的交流电周期为T,利用图(b)给出的数据(用字母表示)可求出小车下滑的加速度a=________________.
②为了求出小车与斜面间的动摩擦因数
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038250288.png)
用测得的量及加速度a表示小车与斜面间的动摩擦因数
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038265300.png)
①
②斜面上任两点处间距l及对应的高度差h ![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038328824.png)
(若测量的是斜面的倾角θ,则
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038297950.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038328824.png)
(若测量的是斜面的倾角θ,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038343918.png)
试题分析:①由匀变速直线运动的规律知,匀变速直线运动相邻相等时间间隔内位移之差为恒量,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038359590.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020383751231.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038297950.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038343918.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038437397.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038453610.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002038328824.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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