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摩擦力是三类常见性质力中理解难度最大、命题考查频率最高的一类力,在很多综合性的题目中也有对摩擦力的考查,因此,弄清楚有关摩擦力的概念和内涵非常重要。
Friction is a kind of force that has the most difficulty in comprehending the three most common types of forces and has the highest frequency of proposition examinations. In many comprehensive topics, there are frictional forces. Therefore, it is very important to understand the concept and connotation of friction.