The Universe, who is fascinated by that?

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Rikkitic

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#1659658 28-Oct-2016 12:04

tdgeek:

In orbit is different. We are falling to the earth. We have mass and weight due to Earths gravity. However, we dont deploy a means to add a gravity effect. Why is that? When we are not orbiting, perhaps going to Mars, we wont do that either.

Not sure I understand your intention here. My original question was precisely that, why don't we deploy a means to add a gravity effect when there is a known technique (centrifugal force) that works for this. Is it because it is still too difficult to engineer such a thing in space?

Since posting my question I have read more about this. The use of rotating spacecraft to create simulated gravity is in fact being investigated, and it has been employed on a small scale in tests with mice, but apparently it is still too difficult and maybe not sufficiently cost-effective to be worth trying to scale up at this stage of development. Certainly it isn't being ruled out.

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frankv

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#1659709 28-Oct-2016 12:47

tdgeek:

Rikkitic:

I honestly don't understand what you are going on about. Continuous centrifugal force has the same effect on the body as gravity. Fine, call it something else but the effect is the same and for this purpose that is what matters.

I think he means if you rotate something to cause centrifugal force, its hard to use. But, in space, you have mass, but there is weightlessness, so centrifugal has no force. There is no weight to create a force. Keep it simple. Use magnets to create weight. Lose the magnets to allow you to use the 360 degree space. In the ISS, there are four walls. Or four ceilings, or four floors. I feel magnets are the way to go. Easy and cheap.

You don't seem to understand the physics. Weight is irrelevant, and, what's more, weight does not create a force. Weight is the product of gravity and mass.

Force = MASS * acceleration

If you take a mass and rotate it, you are accelerating it towards the axis of rotation. i.e. you are applying a (centripetal) force towards the axis of rotation.

Magnets do not create weight... they create force. What's more the force gets stronger as the magnet approaches the metal. So, once your magnet is attached to the floor, you won't be able to release it, so won't be able move around. You could conceivably use electromagnets, but then you need to power them somehow.

Fred99

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#1659817 28-Oct-2016 14:09

Sobering:

frankv

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#1659839 28-Oct-2016 14:37

Interesting. OTOH, all the American missions are post-1975, whereas all but one of the Russian ones are before that. (Let's not mention the Europeans ;) )

Sticking with the sporting analogy... the men's pole vault record was 5.65m in 1975, and is now 6.16m.

At the Montreal Olympics (1976), the 3 medallists all cleared 5.50m in the final. At Rio, you had to clear 5.60m just to qualify for the final, and the winner cleared 6.03m, silver 5.98m, bronze 5.85m

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