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Physics, Astronomy & Cosmology / Do rockets work due to conservation of momentum theory or imbalanced forces?
« on: 03/02/2020 00:16:31 »
The rocket is not required to "push" or provide a force for the exhaust to overcome it's inertia. The external force to change the exhaust's inertia comes from pressure gradient force. The force that causes high pressure to move toward low pressure. Therefore, conservation is always conserved without the rocket in the picture. Pressure gradient force is a potential force like gravity. When you drop a ball from your hand from a height, the ball does not need your hand to apply a force in order to conserve momentum as gravity provides the force for the ball to overcome it's inertia.
A rocket is said to work using this example: If you fill a balloon with air and hold the neck closed, the pressure inside the balloon is slightly higher than the surrounding atmosphere. However, there is no net force on the balloon in any direction because the internal pressure on the balloon is equal in all directions. If you release the neck of the balloon, it acts like a hole, with no surface area for the internal pressure to act on. There is now an imbalanced force on the balloon, and the internal pressure on the front of the balloon is greater than the internal pressure on the back of the balloon.
So therefore, the conservation of momentum effect is not correct. A person standing on a skateboard throwing medicine balls to create movement is a false analogy. Why do schools and most sources teach this false analogy?
A rocket is said to work using this example: If you fill a balloon with air and hold the neck closed, the pressure inside the balloon is slightly higher than the surrounding atmosphere. However, there is no net force on the balloon in any direction because the internal pressure on the balloon is equal in all directions. If you release the neck of the balloon, it acts like a hole, with no surface area for the internal pressure to act on. There is now an imbalanced force on the balloon, and the internal pressure on the front of the balloon is greater than the internal pressure on the back of the balloon.
So therefore, the conservation of momentum effect is not correct. A person standing on a skateboard throwing medicine balls to create movement is a false analogy. Why do schools and most sources teach this false analogy?