一、平抛运动的特点平抛运动是一类重要的匀变速曲线运动 ,它的特点是物体以一定的初速水平抛出 ,只受重力作用 .由平抛运动可推广得到物体做类平抛运动的条件 :1受恒力作用 ;2初速度方向与恒力垂直 .例如 ,摆球在竖直平面内绕悬点摆动 ,摆到最低点时绳突然断裂 ,此后摆球所做 First, the characteristics of flat-throw motion Flat-throw motion is an important uniform variable-speed curve movement, which is characterized by objects thrown at a certain initial velocity level, only by the role of gravity. Can be promoted by the flat-throw motion objects to do class flat throw The conditions of the movement: 1 is affected by the constant force; 2 the direction of the initial velocity is perpendicular to the constant force. For example, the pendulum ball swings around the hanging point in the vertical plane, the rope suddenly breaks when the pendulum swings to the lowest point, and then the pendulum ball does