Correct.Xilus said:
You can have a net force, without a net torque.Xilus said:
You need a net force, to change linear momentum.Xilus said:
There were some recent efforts by NASA to verify some tiny effects. But that has northing do with Laithwaite's misunderstandings of gyroscopes.sophiecentaur said:
Xilus said:
But there is the same feel about the topic and I am waiting for NASA to say that the effects were due to experimental error. But who knows what the finer effects of GR could produce under extremes of gravity?A.T. said:
Do you happen to have any ball park figures on that experiment?anorlunda said:Not true. No mysteries here, just ordinary life. The ball throwing machine converts angular to linear. A bullet hitting the tail of the rooster converts linear to angular.
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Energy can be transferred between linear KE a angular KE, because it is the same physical quantity.anorlunda said:
Total linear and total angular momentum are conserved in both cases.anorlunda said:
And all those are against the forum rules.sophiecentaur said:
I stand corrected. Brain not working this morning.mfb said:
It works when the first sling shot sends the craft to catch up with the second planet. Each close encounter gives the craft extra momentum - but the detail of the trajectory is fairly critical. The gain in speed will be comparable with the 'forward' speed of the target planet; the orbit round the planet has to be hyperbolic so that the craft is not captured. Google "Slingshot Orbit" Images and see loads of pictures.Xilus said:
You mean a net gain in momentum.Xilus said:
Sure, total momentum is conserved.Xilus said:
Only in very rare circumstances. You can only gain velocity if the outgoing trajectory is closer to the orbital direction than the incoming trajectory. But every spacecraft motion we can get with current propulsion methods is close to circular orbits. The change in the angle cannot be large, which means the increase in speed cannot be large either, especially for the inner planets.sophiecentaur said:
If you stood on a low friction platform which had the ability to rotate and held out an operating giro the platform and yourself would rotate.Xilus said:
I don't understand that bit. Escape velocity refers to getting off the surface, doesn't it? The craft doesn't get that near does it and it is very small in proportion to any of the planet's mass.mfb said:
Imagine a tiny asteroid. How do you want to use it to change the spacecraft velocity by any significant amount?sophiecentaur said:
Yes, two gyros can produce thrust through the principle of conservation of angular momentum. When two gyros spin in opposite directions, their angular momentum cancels out, resulting in a net force in the opposite direction. This force is known as thrust.
Two gyros produce thrust by spinning in opposite directions and canceling out each other's angular momentum. This results in a net force in the opposite direction, which is known as thrust.
The amount of thrust produced by two gyros depends on the speed of rotation, the mass and size of the gyros, and the distance between them. The faster the gyros spin and the larger their size and mass, the greater the thrust produced. Additionally, a shorter distance between the gyros will result in a stronger thrust.
It is possible for two gyros to produce enough thrust to lift an object, but it would require a significant amount of energy and precise control over the gyros' rotation. In most cases, other propulsion methods would be more practical and efficient for lifting objects.
Yes, two gyros can be used in some propulsion systems, such as reaction wheels and control moment gyros, to provide precise control and stabilization for spacecraft and satellites. However, there are more efficient and practical methods for producing thrust in most other applications.
