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惯性现象在日常生活中无处不在.课本里为了使学生对惯性这一概念有一个直观、形象的理解,做了如图l的两个演示实验.图1中甲车上的木块为什么向后倒?分析原因是:刚开始小车和木块都处于静止状态,当小车受到向前的拉力作用,由于力是改变物体运动状态的原因,使小车由静止变运动.而木块的底部受到摩擦力作用也跟着小车一起向前运动.由于木
The inertia phenomenon is ubiquitous in everyday life. In order to make students have an intuitive and visual understanding of the concept of inertia, two demonstration experiments as shown in Fig. 1 are done in the textbook. Why is the wooden block on car A in Fig. 1 The reason for the analysis is that the car and the wooden block are at a standstill at the beginning. When the car is subjected to a forward pulling force, the force changes the motion of the object and causes the car to move from a static position to a downward motion. The bottom of the block is affected. Friction also moves forward along with the trolley.