首页/ 题库 / [单选题]用水平压力 把一个物体压着靠在粗糙的竖直的答案

用水平压力 把一个物体压着靠在粗糙的竖直墙面上保持静止,当 逐渐增大时,物体所受的静摩擦力( )。

单选题
2021-09-01 19:28
A、恒为零
B、不为零,但保持不变
C、随F成正比增大
D、开始随F增大,达到某一最大值后,就保持不变
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正确答案
D

试题解析

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