所有的抛体运动均可以理解为自由落体运动与匀速直线运动的合运动,只是匀速直线运动的方向不同而已。一切抛体运动都是最简单的匀变速直线运动——自由落体运动的合成与演变,把握好它们的关系,抛体运动也就迎刃而解了。一切类抛体运动只满足唯一的条件是:在物体所运动的平面内受到恒力。其规律又都是最简单的类自由落体运动的合成与演变。 All the projectile movement can be understood as free-fall movement and uniform linear motion of the combined movement, but the direction of uniform linear motion only. All the projectile movements are the most simple uniform speed linear motion - the composition and evolution of free-fall movement, grasp their relationship, the projectile movement will be solved. The only condition for all types of projectile motion to satisfy only is that it receives constant force in the plane of motion of the object. The law is the simplest kind of free-fall movement synthesis and evolution.