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运动的合成与分解是处理曲线运动的常用方法,也是一个重要的方法,如抛体的运动可分解为水平方向的匀速直线运动和竖直方向的匀变速直线运动;带电小球在水平匀强电场中抛出(速度方向与电场方向、重力方向在同一平面内),可分解为水平方向的匀变速直线运动和竖直方向的匀变速直线运动;还有如类抛体运动,都是将曲线运动分解为两个直线运动进行求解.
The synthesis and decomposition of motion is a common method of dealing with curve motion. It is also an important method. For example, the motion of the projectile can be decomposed into a uniform straight-line motion in the horizontal direction and a uniform linear motion in the vertical direction. Thrown in the electric field (speed direction and electric field direction, the direction of gravity in the same plane), can be decomposed into a horizontal direction of the uniform speed linear motion and vertical uniform linear motion; also such as the type of projectile movement, are the curve The motion is decomposed into two linear motions to solve.