题目内容
(10分)如下图所示工人在推动一台割草机.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228195414077.jpg)
(1)画出100 N的力的水平和竖直分力.
(2)若割草机重300 N,则它作用在地面上向下的力是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228195414077.jpg)
(1)画出100 N的力的水平和竖直分力.
(2)若割草机重300 N,则它作用在地面上向下的力是多少?
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228195411421.jpg)
(2)350 N
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228195411421.jpg)
(2)350 N
(1)如下图所示.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228195411421.jpg)
(2)推力向下的分力F1=Fsin 30°=50 N
对地的作用力F合=F1+mg=350 N
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241228195411421.jpg)
(2)推力向下的分力F1=Fsin 30°=50 N
对地的作用力F合=F1+mg=350 N
![](http://thumb2018.1010pic.com/images/loading.gif)
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