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计算或测量了力的大小后,你可以得出两个力的合力。下面我们教你怎么做。
步骤
- 如果有斜向的力,即以一定角度给物体施加作用的力,需要找出水平分力(Fx) 和竖直分力(Fy),来找出它的大小。这里要用到三角函数,以及方向角 (一般是 θ, "theta")。方向角 θ 总是从x正半轴开始测量。
- 使用三个基本的三角比率,将斜力作为一个直角三角形的斜边,直角边是Fx、Fy。因此:
- Fx = cos θ * F
- Fy = sin θ * F
- 注意,可能会有多个斜力同时作用在一个物体上,所以要找出他们的Fx和Fy。然后在Fx方向合并,Fy方向也合并,得到最后的水平和竖直方向的合力。
- 把最终两个方向的合力代入计算斜向合力的公式: sqrt((Fx_total)2 + (Fy_total)2)广告
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