Welcome to our exploration of rocket launches. A rocket launches by expelling hot gas downward at extremely high speed. This creates thrust that pushes the rocket upward, following Newton's Third Law of Motion. For every action, there is an equal and opposite reaction. Let's see this principle in action.
Before launch, the rocket undergoes extensive preparation. First, the fuel tanks are loaded with liquid fuel like RP-1 or hydrogen, along with liquid oxidizer such as oxygen. Engineers perform comprehensive system checks on engines and navigation computers. Finally, the ignition sequence begins with a spark that ignites the fuel mixture, starting the combustion process that will generate thrust.
当推力超过火箭重量加上大气阻力时，火箭开始升空。火箭向上加速，遵循精心设计的轨道穿越大气层。随着燃料消耗，火箭变轻，加速度增大。火箭必须达到约每秒十一公里的速度才能获得轨道速度，摆脱地球引力。
Multi-stage rockets use a clever design to reach orbit efficiently. The first stage, with the largest engines and most fuel, provides initial thrust to escape Earth's atmosphere. When its fuel is exhausted, it's jettisoned to reduce weight. The second stage, smaller but more efficient, continues the journey and achieves orbital velocity of eleven point two kilometers per second, allowing the rocket to orbit Earth or escape to other destinations.
To summarize what we've learned about rocket launches: Rockets work by applying Newton's Third Law, expelling hot gas downward to create upward thrust. The multi-stage design allows rockets to shed weight as fuel is consumed, maximizing efficiency. Achieving orbital velocity of eleven point two kilometers per second enables rockets to reach space and deploy satellites that benefit our daily lives.