研究抛射的学问打过气枪的人都知道,要打远处的小鸟,必须把瞄准点提高一些,如果直接瞄准小鸟打枪,那么弹丸就会从小鸟下面穿过去,落了空。这是什么道理呢?因为弹丸在受到弹力飞出以后,地心吸力将它往下拉,使它不能沿一直线飞行,而在空间划出了一道曲线。弹丸在空中跑的路线叫弹道。实际上,决定弹道的除了弹丸出枪口的速度(初速)、枪和水平面所成的角度(射角)以及地心引力(重力)之外,还有空气阻力、风速等许多因素。所以弹道是复杂的,而它在军事上又非常重 Studying the science of throwing shots Everyone who knows about air guns knows that if you want to play in distant birds, you must raise the aiming point. If you aim directly at the birdie, then the projectile will pass under the bird and fall. What is the reason for this? Because after the projectile has been ejected by the elastic force, the center of gravity sucks it down so that it cannot fly in a straight line and draws a curve in space. The course where the projectile ran in the air was called trajectory. In fact, there are many factors that determine the trajectory, such as air resistance, wind speed, etc., in addition to the speed at which the projectile exits the muzzle (muzzle velocity), the angle formed by the gun and the horizontal plane (angle of incidence), and the gravitational attraction (gravity). So the trajectory is complicated, and it is very heavy in the military