斜面的問題(加速度與力)
2013-03-06 3:58 am
圖片參考：http://imgcld.yimg.com/8/n/HA06399860/o/20130305195406.jpg
如圖，一物體置於傾角為θ的光滑斜面上。現在斜面向左以加速度a加速，使物體和斜面保持相對靜止。求a。
回答 (1)
2013-03-06 7:51 am
✔ 最佳答案
Let R be the normal reaction (法向反作用力) acting on the object, m be the mass of the object, and g be the acceleration due to gravity.Hence, resolve R horizontally and vertically
R.sin(theta) = ma
R.cos(theta) = mg
Dividing, sin(theta)/cos(theta) = ma/mg
i.e. tan(theta) = a/g
a = g.tan(theta)
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130305000051KK00321