what is the effect of friction on the velocity of a moving object?
词汇：
effect:作用,影响 friction of effect:摩擦力的作用
veloctiy:速度,速率（要看具体情况）
velocity of a moving object:运动物体的速度
连起来,这句话意思就是：“摩擦力对运动物体的影响如何?”
一般来说,分模块理解比较快!
what is the effect of friction on the velocity of a moving o
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