What is time??

[hansda]

To understand the nature of time, it seems it's necessary to understand the nature of space.

I guess.

I fully agree with you that, it is necessay to understand 'space' well ; to understand 'time' well . Our knowledge of space is as little and incomplete as our knowledge of time .

So what is the nature of space?

As space expands and contracts ; space has the property of elasticity . Space behaves like a spring . The distance 'dx' , can be considered as a small spring . Smallest unit of space can be considered as 'dx-cube' .

 

[hansda]

It simply is not what is happening. A mass has some gravity (force field as you call it), but a mass that is at high speed does not have more gravity associated with it.

There are some types of force ; whoose value depends upon speed . So, the gravity of a mass also can vary with speed .

 

[origin]

There are some types of force ; whoose value depends upon speed .

Such as?

 

[OnlyMe]

Such as?

Kinetic.

 

[origin]

Kinetic.

That is energy. He is talking about force. I know of course, that if the if you have 2 identical masses traveling at different speeds and if you stop them in the same distance the applied forces will be different.

My problem is that hansda is making stuff up. He is arguing about things for which he has no working knowledge.

So I am not going to give him a pass on using physics terms incorrectly and applying concepts incorrectly.

I mean for crissake he says "some types" of force depend speed, so it follows that gravity depends on speed? WTF?

 

[OnlyMe]

That is energy. He is talking about force.

You are correct of course.

It seems at times several of those posting confuse the two and I very often assume the more generous interpretation of thier intent.

I also must admit, that while I continue to watch some threads in the hope an interesting disscussion will develope, I have slid into a pattern of skimming the content of some author's posts. This sometimes, as in this case, exagerates the the situation.

 

[Dywyddyr]

I mean for crissake he says "some types" of force depend speed

Yup.
The force of stupidity seems to make people much slower at grasping the point.

 

[origin]

You are correct of course.

It seems at times several of those posting confuse the two and I very often assume the more generous interpretation of thier intent.

I also must admit, that while I continue to watch some threads in the hope an interesting disscussion will develope, I have slid into a pattern of skimming the content of some author's posts. This sometimes, as in this case, exagerates the the situation.

My assessment is that you are more knowledgeble than me and a nicer person.

However, I have 2 horses - Ha ha! Oh wait, that makes me even dumber.

 

[origin]

Yup.
The force of stupidity seems to make people much slower at grasping the point.

Good point. There is also an entropy aspect in there somewhere, I think. A tremendous amount of energy is expended by some individuals defending a nonsensical postion. This energy is lost never to be recovered.

These people are hastening the heat death of the universe!!

 

[OnlyMe]

Momentum can be thought of as a force, or the force that an object adds to a collision between two objects.

As such an object's kinetic energy, which can be associated with it's speed (better described as velocity), which contributes to its momentum, can be viewed as connecting an objects velocity (or crudely its speed), to the force described by its momentum, in such a collision.

 

[AlexG]

So, the gravity of a mass also can vary with speed .

No.

 

[whynot]

One way to infer what time is, is to stop time and then see what remains in nature and what is lost. Time will be directly related to the difference since the loss of the time variable will define what is left.

Say we take a snap shot of all the laws of physics and motion occuring at the same time, so we stop time. What we lose is velocity, acceleration, the action or expression of force and all dynamic expressions of energy. What remains is mass, charge, particles, potential energy, distance and space. Also all the forces appear to be at steady state, since there is no action or reaction. There are some other things if one wishes to add.

Based on this diffence we know what time is responsible for. I like to call this area of respnosibility time potential.

Time potential allows velocity, acceleration, kinetic energy, can change the steady state expression of force, allows entropy to increase, to name a few.

I think of time as an element, like wind, fire, water. Im curious as to what created dust in outer space?

but time if it has to do with accelertion , potential, velocity, might it also have rest? i was thinking before how everything seems to have a behavior, including time, burning up and releasing energy, like fuel. maybe time is a residue of decay from carbon? that is really stretching my imagination.

 

[Dywyddyr]

I think of time as an element

It's not, it's a dimension.

like wind, fire, water.

These aren't elements.

maybe time is a residue of decay from carbon? that is really stretching my imagination.

Or your ignorance.

 

[hansda]

There are some types of force ; whoose value depends upon speed .

Such as?

Such as : frictional-force ; air-drag ; resistive force for gyro precession .

 

[hansda]

So, the gravity of a mass also can vary with speed .

No.

I think you agreed with the fact that , gravity ( or force-field ) exists around a mass .

 

[Dywyddyr]

Friction?

 

[hansda]

Friction?

See wikipedia for 'force-field' .

 

[OnlyMe]

Such as : frictional-force ; air-drag ; resistive force for gyro precession .

The resistive force you refer to relative to precession, is inertia or momentum?

An object will resist a change in its angular momentum both as an acceleration or deceleration. That would be expressed as inertia, but in itself I don't think it could be called a force intrinsic to the object.

An object's angular momentum does have an impact on its precession, and I guess in as much as linear momentum can be considered a force in some interactions, so too could an object's angular momentum. But for it to be considered a force there needs to be some external interaction. In the case of the angular momentum of a gyroscope or any object for that matter, once you set aside friction and any electromagnetic interactions, what is the external interaction with?.., space itself?

 

[Dywyddyr]

See wikipedia for 'force-field' .

You mean the fictional device?
No mention.
The physics version?
I think you'll find that the velocity-dependence refers to fluid friction, which is covered in your "air-drag" comment.
From Wiki on Friction:

Coulomb's Law of Friction: Kinetic friction is independent of the sliding velocity.

 

[hansda]

The resistive force you refer to relative to precession, is inertia or momentum?

An object will resist a change in its angular momentum both as an acceleration or deceleration. That would be expressed as inertia, but in itself I don't think it could be called a force intrinsic to the object.

An object's angular momentum does have an impact on its precession, and I guess in as much as linear momentum can be considered a force in some interactions, so too could an object's angular momentum. But for it to be considered a force there needs to be some external interaction. In the case of the angular momentum of a gyroscope or any object for that matter, once you set aside friction and any electromagnetic interactions, what is the external interaction with?.., space itself?

Consider it simply : force = mass * acceleration ; or force = inertia * acceleration . Doesnt inertia vary with rpm or speed ?