The working principle of a rocket engine is based on the-

  1. Newton’s first law of motion
  2. Newton’s second law of motion
  3. Newton’s third law of motion
  4. Conservation of energy

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  1. Newton’s third law of motion
    • Newton’s third law states that if we are applying a force on any object then that object also applies equal and opposite force on us. It is also called the action and reaction force.
    • Applied force = Reaction force.
    • Rocket exhausting a gas with a very high velocity which provides the reaction force on the rocket, due to which it moves upward.
    Newton’s first law of motion-
    • Newton’s first law states that an object will remain at rest or in uniform motion unless an external force acts upon it.
    • It is also called the law of inertia.
    Newton’s second law of motion
    • The acceleration of any object is directly proportional to the net applied force.
    • The direction of the acceleration of the object will always be in the direction of the net applied force.
    • F = ma, where m is the mass of the object and a is the acceleration of the object.
    Conservation of energy
    • The conservation of energy states that energy neither can produce nor can destroy, it can convert from one form to another form.
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