Conservation of Momentum in Jet Aeroplanes
Jet aeroplanes follow the principle of conservation of momentum to achieve flight and maneuver in the air. This principle states that the total momentum of a closed system remains constant if no external forces are acting on it. In the case of jet aeroplanes, this principle is crucial for understanding how they are able to move through the air efficiently.

Thrust
- Jet engines generate thrust by expelling a large amount of air at high speeds in the opposite direction.
- According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means that as the engine expels air backward, the aeroplane moves forward.

Newton's Second Law
- Newton's second law of motion states that the force acting on an object is equal to the rate of change of its momentum.
- In the case of a jet aeroplane, the thrust generated by the engines accelerates the aeroplane forward, increasing its momentum.

Flight Maneuvers
- When a jet aeroplane needs to change its direction or altitude, it adjusts its thrust and control surfaces.
- By changing the direction of the thrust or the angle of the control surfaces, the aeroplane can alter its momentum and achieve the desired maneuver.

Conservation of Momentum
- Throughout all these processes, the total momentum of the jet aeroplane system remains constant.
- Any change in momentum in one direction is balanced by an opposite change in another direction, ensuring that the aeroplane stays in control and maintains its flight path.
In conclusion, the conservation of momentum plays a vital role in the operation of jet aeroplanes, allowing them to achieve flight, maneuver through the air, and maintain stability during various flight conditions.