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82问答网 > 谁能帮我把这道物理计算题的过程详细写一下，谢谢大佬们！

谁能帮我把这道物理计算题的过程详细写一下，谢谢大佬们！

2025-04-05 06:09:36

推荐回答（1个）

回答1：

好的LZ
看来您初中的二元一次方程组不是很精通啊....
这一题因为Fn, F内形式对称,所以可以加减消元
第一式保留
Fnsinθ - F内cosθ=mv^2/r ----(1)

第二式乘以tanθ
Fnsinθ + F内sinθtanθ=mg tanθ ----(2)
(2)-(1),得
F内 (sinθtanθ+cosθ)=mgtanθ - mv^2/r
这里,sinθtanθ+cosθ=sin^2 θ/cosθ +cos^2 θ/cosθ=1/cosθ [三角函数sin^2 θ+cos^2 θ=1]

方程两边同乘以cosθ
F内=mgsinθ - (mv^2/r)cosθ

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