A rocket experience an impulse from the engine, and that changes the momentum of the rocket.
火箭从发动机获得冲力，那改变了火箭的动量。
2
Impulse and momentum change; rocket equation; origin of pressure from random motion.
冲量，动量的改变；火箭方程；随机运动的压力作用点。
3
Further topics include kinematics, particle dynamics, motion relative to accelerated reference frames, work and energy, impulse and momentum, systems of particles and rigid body dynamics.