当物体的运动比较复杂时,我们可将复杂的运动分解为简单的运动进行研究.力的独立作用原理和运动独立性原理是解决复杂运动的基本规律,也是处理“力和运动”问题的基本方法.如何把复杂的运动分解为已知的简单运动是解题的难点和关键.本文将这类问题分类归纳如下.一、可分解为匀变速直线运动和匀速圆周运动例1 如图1所示,竖直放置的内壁光滑的圆桶 When the motion of an object is complex, we can decompose the complex motion into a simple motion for research. The principle of independent action of force and the principle of independence of motion are the basic rules for solving complex motions, and they are also basic for dealing with “force and motion” problems. Methods. How to decompose complex motions into known simple motions is the difficulty and key to solving the problems. This paper classifies these problems into the following categories. First, it can be decomposed into uniform speed linear motion and uniform circular motion. Example 1 Shows a vertically placed drum with a smooth inner wall