动力学习题是高中物理习题中的重点与难点,学生对此类习题常感觉太难太活。于是,各种解题方法应运而生。然而由学生独立地去解答又往往不得要领。笔者认为,对动力学知识的核心——运动和力的关系的深刻把握才是顺利解答问题的关键,也是一切好的解题方法的基础。只有把运动(速度,速度变化等)和力之间互相依存、互相制约的关系揭示清楚,才能在头脑中形成准确的物理图景,才能构思出求解的具体步骤,才能真正杜绝思路不清,过程混淆,乱套公式的弊病。 Dynamic study questions are the key and difficult points in high school physics exercises. Students often feel too difficult or too live for such exercises. As a result, a variety of problem solving methods came into being. However, it is often not essential for students to answer independently. The author believes that the deep understanding of the core of dynamic knowledge—the relationship between motion and force—is the key to a smooth solution to the problem, and is also the basis of all good solutions. Only by clearly revealing the relationship between movement (speed, speed change, etc.) and force interdependently and mutually restricting one another, can an accurate physical picture be formed in the mind, and then the specific steps of the solution can be conceived to truly eliminate the ill-defined process. Confusion, indiscriminately set the drawbacks of the formula.