Thread: similar to antigravity acelerating things while they feel 0g

1. imagine a soft spring, just by holding it vertical in the floor it will compress, if you put it in a rocket and accelerate it it will compress as well

if you put it in a centrifugator you can compress it a lot

but if you put it inside a tube and swing the tube very fast certainly it will acelerate very fast but i think is very intuitive to see the spring on this case wont compress since holds on nothing as to compress if you suppose friction 0, just as if you acelerate it by dropping it and let gravity do its job

so with this method i think you could acelerate anything at very high speeds while it only will feel 0 g, very similar to gravity

2.

3. Originally Posted by luxtpm
imagine a soft spring, just by holding it vertical in the floor it will compress, if you put it in a rocket and accelerate it it will compress as well

if you put it in a centrifugator you can compress it a lot

but if you put it inside a tube and swing the tube very fast certainly it will acelerate very fast but i think is very intuitive to see the spring on this case wont compress since holds on nothing as to compress if you suppose friction 0, just as if you acelerate it by dropping it and let gravity do its job

so with this method i think you could acelerate anything at very high speeds while it only will feel 0 g, very similar to gravity

The problem is that I assume that you are laying the spring along the length of the tube. The acceleration is felt in the direction of the rotation of the tube at a right angle to the tube's length. The spring doesn't compress for the same reason as it doesn't compress if you lay it on its side in your first example. The object in tube tube will still feel its acceleration.

4. so i see we can agree that in this case the radial g force is zero

the problem is the tangential aceleration

well what would happen if you decreased the rotational speed of the tube as the radius of the projectile grows in such a way that the tangential speed remains constant and therefore tangential aceleration would be 0

5. Originally Posted by luxtpm
so i see we can agree that in this case the radial g force is zero

the problem is the tangential aceleration

well what would happen if you decreased the rotational speed of the tube as the radius of the projectile grows in such a way that the tangential speed remains constant and therefore tangential aceleration would be 0
Then there would be no change in speed at all. It is the tangential acceleration that causes the object to leave the tube with a greater speed than it started with.

If you start with the object near the center of rotation of the tube and moving at 0.001 meter per sec, and as it moves outward slow the rotation to keep its tangential speed at 0.001 m/s., it will leave the tube at 0.001 m/s. Not only that, but it will [i]still[i/] feel an acceleration force because the tube will change its direction of motion, which is also an acceleration.

The only way to keep the object from feeling any acceleration force would be to constantly adjust the rotation rate such that the tube does not change the object's original speed or direction. But in that case the object is just traveling in a straight line at its original speed, which it would have done if the tube had been there or not.

6. ok thanks i see centrifugal force is quite different from gravity

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