天气预报 > 其他 > 科学画力臂用虚线还是实线
科学画力臂用虚线还是实线
更新时间: 2020-09-25 00:00:00  

力臂是实线,其反向延长线为虚线。

力臂画法遵循以下几步:

1、找点:找到杠杆的支点;

2、画线:画出动力或阻力所在的直线;

3、从点到线做垂线段;

4、从支点到力的作用线做垂线段,该段距离就是力臂:用大括号把该段距离标出来;

5、标出力臂的符号。

关键词: 科学 力臂 虚线 还是

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