Question

After landing the aeroplanes momentum becomes zero. Explain how the law of conservation holds here

Answer 1

Answer:

The Law of conservation of momentum states that momentum is constant if there is no external force is applied. Here the external force is applied in the form of brakes and thrust reversers, So the law of conservation of energy or law of conservation of momentum is not applied here.

Explanation:

• After landing, the Aeroplane's momentum does not become zero as the plane decelerates due to the application of brakes present in the landing gear. Most planes also have thrust reversers in the engines which utilize energy to change the plane's momentum.
• Aeroplane is utilizing energy to shed momentum. Both the momentum and energy are not conserved here.
• Also, momentum becomes zero when the velocity of the airplane must be zero, which cannot be in this case as the airplane is deaccelerating.

Answer 2

Answer:

• Law of conservation of energy states that energy is always conserved no matter what.
• So, in this question, we have got a aeroplane that is flying and is having certaain kinetic energy.
• Now, after landing the momentum of plane is becoming zero.
• So, momentum change does not affect energy conservation. In this situation the plane is changing the form of energy.
• Initially it was having kinetic energy but after landing that kinetic energy is being converted into potential energy of eqaual magnitude and value.
• So, the law of conservation is still being followed.

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