直线运动一章是整个动力学部分的基础,掌握好本章的基本概念和基本公式对于正确解题至关重要,因此有必要澄清一些学习中的错误认识,以便为以后的学习扫清障碍.一、平均速度的大小就是平均速率吗?很多初学者认为,瞬时速度的大小叫瞬时速率,平均速度的大小叫平均速率.对于前半句是无庸置疑的,但后半句是错误的,因为平均速 The chapter on linear motion is the basis of the whole dynamics. It is very important to grasp the basic concepts and basic formulas of this chapter to solve the problem correctly. Therefore, it is necessary to clarify some mistakes in learning in order to clear the obstacles for future study. The average speed is the average speed? Many beginners believe that the instantaneous speed is called the instantaneous speed, the average speed is called the average speed. For the first half of the sentence is unquestionable, but the latter half is wrong, because the average speed