火箭弹或火箭的运动,是基于利用所谓反作用力的原理。当火箭弹弹体内的燃料燃烧的时候,形成气体,这气体以高速度经过一个特制的孔——喷口——喷出。气流从燃烧室喷出的时候,在自己的运动方向上产生—个力。这个力的大小决定于喷出气体的质量和气体的喷射速度。我们从力学知道,作用和反作用永远相等。因此,在我们这里,在气流运动方向上有力产生的时候,同时就应当产生—个和它大小相等而方向相反的力;在这个力的作用下,火箭弹便开始向前运 Rocket or rocket movement is based on the use of the so-called reactionary principle. When the fuel in the rocket projectile burns, a gas is formed, which is spouted at a high velocity through a special orifice-orifice. When the air is ejected from the combustion chamber, it produces a force in its own direction of movement. The size of this force depends on the quality of the gas being ejected and on the gas jet speed. We know from mechanics that the role and reaction are always equal. Therefore, in our case, when a strong force is generated in the direction of the airflow, at the same time a force of equal magnitude and opposite direction should be produced; under this force, the rocket starts to move forward