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平抛运动是一种重要的匀变速曲线运动,其特点是物体在抛出的过程中具有一定的初始水平速度,仅仅只受到重力的作用。平抛运动可以推广得到物体做类平抛运动的条件,即为受恒力的作用,初速度方向与恒力保持垂直。例如,摆球在竖直平面绕着悬点周围摆动,在摆动到最低点时绳子突然断裂,在此之后摆球所做的运动就是平抛运动。又例如,当雨伞围绕着竖直轴转动,伞边缘的水滴甩出所做的运动就是类平抛运动。
Flat throwing motion is an important uniform speed curve movement, which is characterized by the object in the process of throwing has a certain initial horizontal velocity, only by the role of gravity. Flat throwing throwing campaign can promote the object to do the class flat throwing exercise conditions, that is, by the role of constant force, the initial velocity direction and constant vertical. For example, pendulum swing in the vertical plane around the hanging point, when the swing to the lowest point when the rope suddenly rupture, after which the ball swing is done flat-throwing exercise. As another example, when the umbrella is rotated about the vertical axis, the movement of the water drop thrown out by the edge of the umbrella is a flat-like motion.