# The Naked Scientists Forum

### Author Topic: how do forces resolve  (Read 1902 times)

#### LetoII

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• Posts: 64
##### how do forces resolve
« on: 09/10/2012 01:34:17 »
in a picture i have very poorly drawn a shape.
how do the forces resolve in the u turns if a ball starts on both outside parts of the tracks

#### LetoII

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##### Re: how do forces resolve
« Reply #1 on: 17/10/2012 00:19:44 »

balls each have 1/3 the total weight of the track.
balls are kept in rotation by the forcegrids even though they both point the same way, this means the push is harder on outside compared to the inside.
balls start at the same point of the outside track

#### Supercryptid

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##### Re: how do forces resolve
« Reply #2 on: 18/10/2012 03:31:19 »
I think further elaboration is necessary. What are these "forcegrids" you speak of? What do you mean by the forces "resolving"?

#### evan_au

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##### Re: how do forces resolve
« Reply #3 on: 18/10/2012 09:01:49 »
• Is there an axle connected to the center of the "X" (connected to a generator, perhaps?)
• Are the two oval tracks interconnected by the "X" (so the balls can cross from one oval track to the other), or does a ball remain permanently on its own oval track?
• Do the chevrons "^" represent the forcegrids - ie something like a magnetic linear motor that could accelerate a metal ball?
• Is the direction of the chevron significant? ie does the one on the outside accelerate the ball, and the other decelerate it to a stop? (or maybe to some other speed?)
• I assume we make the usual assumptions in physics land - no atmospheric drag, no friction, etc etc...

By the way, are you hoping to build a perpetual motion machine, perhaps?

#### LetoII

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##### Re: how do forces resolve
« Reply #4 on: 19/10/2012 02:30:35 »
- yes there needs to be a generator but that's too detailed to put in the question i think.
- to make things easy i want you to consider the left and right side to be equal in weight.
- by force grid i simply mean the surface that's marked with the stripes, it pushes the balls i speak of in the direction of the point of the marks / stripes i made.
- Indeed, like a magnetic linear motor but on 2 sides instead of 1. i think 1 sided would be a problem / add instability.
- One side pushes it arround the turn and the other decelerates it but allows enough speed to remain to make it through the next turn and into the next acceleration otherwise the whole thing would come to a hold :)
- No friction as this is supposed to fly outside of the atmosphere.
- I think i can safely say that the whole thing should remain stable when the balls are being pushes by the grids since left / right side cancel out so there is only one direction left to travel in, but i'm not sure what happens in the turns.
- Making things harder we could add acceleration / decaleration in the turns too but for now i think we should assume there's a centripital force at work here in the turns (on both sides).

no this isn't a perpetual motion machine, it needs a strong power source to work for long times. it's an idea for flying based on something different than burning fuel.

#### evan_au

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##### Re: how do forces resolve
« Reply #5 on: 19/10/2012 11:18:05 »
We can resolve all these forces fairly simply by just enclosing the whole OXO construction inside an opaque box.

Whatever forces exist between the different parts of the OXO, these all cancel out inside the opaque box. It may be able to spin around the center of the X, but this is all inside the box.

There is no force between the opaque box and the rest of the universe, so we can say that there is no acceleration of the OXO compared to the rest of the universe. This machine can't be used for linear propulsion in space.

#### LetoII

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##### Re: how do forces resolve
« Reply #6 on: 19/10/2012 20:06:52 »
if the linear propulsion pushes both weights backwards / forwards then doesn't the rest of the thing go in the opposite direction. both in respect to the balls and the universe?

#### The Naked Scientists Forum

##### Re: how do forces resolve
« Reply #6 on: 19/10/2012 20:06:52 »