纵观中学物理教材,重点内容无疑是动力学和电磁学,其中重点部分又是物体、粒子的运动,而“速度”经常是问题直接或间接所求的物理量。这些内容也是教学的难点,学生遇到这些内容的相关题目时,束手无策,物体运动过程也不清楚,乱套公式。 Throughout the middle school physics textbooks, the key content is undoubtedly the dynamics and electromagnetism, the key part of which is the movement of objects and particles, and “speed ” is often the physical quantity sought directly or indirectly by the problem. These content is also a teaching difficulty, students encounter these topics related content, helpless, object movement process is not clear, arbitrary formula.