一质量为m的木块沿倾角为θ的斜面匀速下滑，则斜面与物体间的摩_爱下问搜题

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问题填空题

一质量为m的木块沿倾角为θ的斜面匀速下滑，则斜面与物体间的摩擦力为______，摩擦因数为______．

答案

对物体进行受力情况分析：重力mg、支持力N和滑动摩擦力f．由平衡条件得知，N和f的合力与重力mg大小相等、方向相反，如图，则有

N=mgcosθ，f=mgsinθ

故动摩擦因数为：μ=

f

N

=tanθ

故答案为：mgsinθ，tanθ

填空题

用所给词的适当形式填空。

not do wear clean be play

1. Don’t                the blackboard , there’s something important on it .
2. The questions           really difficult, I don’t know the answers to them.
3. When          he usually            the piano?
4. John always             a special costume .
5. He                 his homework at school, he does it at home

问答题简答题

简析排比手法对《生活是多么广阔》表达感情的作用。