Class 9 Exam > Class 9 Questions > A rocket works on the principle of:a)conserva...
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A rocket works on the principle of:
- a)conservation of energy
- b)conservation of linear momentum
- c)conservation of inertia
- d)conservation of force
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A rocket works on the principle of:a)conservation of energyb)conservat...
Rocket works on the conservation of momentum. In a rocket, the fuel burns and produces gas at high temperature. These gases are ejected out of the rocket from a nozzle at the back side of the rocket. The ejecting gas exerts a forward force on the rocket which help in accelerating. Through the mass of gases escaping per second is very small and their momentum is very large due to their tremendous velocity of escape. An equal and opposite momentum is imparted to the rocket which despite its large mass builds up a high velocity.
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A rocket works on the principle of:a)conservation of energyb)conservat...
Conservation of linear momentum in a rocket:
Explanation:
- When a rocket is launched, it expels gas or exhaust downwards at a high velocity.
- According to Newton's third law of motion, for every action, there is an equal and opposite reaction.
- As the rocket expels gas downwards, the gas exerts a force on the rocket in the opposite direction (upwards).
- This force causes the rocket to accelerate upwards.
- The momentum of the gas (mass x velocity) in the downward direction is equal in magnitude but opposite in direction to the momentum of the rocket in the upward direction.
- According to the principle of conservation of linear momentum, the total momentum of an isolated system remains constant unless acted upon by an external force.
- Therefore, as the rocket expels gas downwards, the rocket gains momentum in the opposite direction, leading to its upward motion.
- This principle of conservation of linear momentum is what allows a rocket to propel itself in space.
Conclusion:
- In conclusion, a rocket works on the principle of conservation of linear momentum, where the momentum of the expelled gas is equal and opposite to the momentum gained by the rocket, allowing it to move in the opposite direction.
Explanation:
- When a rocket is launched, it expels gas or exhaust downwards at a high velocity.
- According to Newton's third law of motion, for every action, there is an equal and opposite reaction.
- As the rocket expels gas downwards, the gas exerts a force on the rocket in the opposite direction (upwards).
- This force causes the rocket to accelerate upwards.
- The momentum of the gas (mass x velocity) in the downward direction is equal in magnitude but opposite in direction to the momentum of the rocket in the upward direction.
- According to the principle of conservation of linear momentum, the total momentum of an isolated system remains constant unless acted upon by an external force.
- Therefore, as the rocket expels gas downwards, the rocket gains momentum in the opposite direction, leading to its upward motion.
- This principle of conservation of linear momentum is what allows a rocket to propel itself in space.
Conclusion:
- In conclusion, a rocket works on the principle of conservation of linear momentum, where the momentum of the expelled gas is equal and opposite to the momentum gained by the rocket, allowing it to move in the opposite direction.
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A rocket works on the principle of:a)conservation of energyb)conservation of linear momentumc)conservation of inertiad)conservation of forceCorrect answer is option 'B'. Can you explain this answer?
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