# Thread: if matter has inertia then what energy has!

1. @ strange:
i have not got the answer  2.

3. Just because you can ask a question doesn't mean there must be an answer!

I don't think the question makes sense. Inertial mass is an intrinsic property of matter. Mass can be converted to energy.

So, I suppose the answer must be: energy.  4. kindly explain w r t, E=mC2 format.

as i am really interested in this matter  5. m = mass (inertial or gravitational, as far as we know they are the same thing).
c2 = a constant of proportionalty
E = energy

Energy and mass are interchangeable.

So, the equivalent of inertia (mass) is ... energy.  6. you are saying that energy has also inertia.  7. Originally Posted by precious you are saying that energy has also inertia.
If mass and energy are interchangeable in GR then, yes, I suppose you can say that. I'm not sure it is helpful, though  8. ok,,,, lets wait for a much certain answer, but you are logically convincing  9. Inertia is a quality or characteristic of matter. Energy does not have inertia. Energy has wave length and amplitude and other characteristics that matter does not have.

Just because matter can be converted in to energy does not mean that the two have the same characteristics. For example: If you can sell a horse for \$500, then one horse = \$500. Both the horse and the money have value but the horse has life and the money will gain interest if you put it in a bank. Just because something can be converted into something else does not mean it has the same characteristis.  10. sealeaf is more convincing  11. Can you say that energy always has a form that has an associated mass?
For example, photons have no rest mass but do have momentum/inertia associated with their energy.  12. Originally Posted by PetTastic Can you say that energy always has a form that has an associated mass?
Yes. For example, energy in any form has a gravitational effect which is the same as the equivalent mass.  13. Originally Posted by Strange  Originally Posted by PetTastic Can you say that energy always has a form that has an associated mass?
Yes. For example, energy in any form has a gravitational effect which is the same as the equivalent mass.
Right, so you have to be sure what the relative part if. Restmass is rest in relation to ..earth. Now that,s relative also (particular perspective). In universal (not particular) sense that,s not necessarily the ultimate objektive perspective.

So it depends how you want to formulate things. Formulated to the particular perspective, restmass is restmass, not subjektive but (then) from the choice of perspective absolute. But it,s not absolute because the point of perspective is relative.

So why not skip the idea of restmass ; all mass is non-restmass (but energy ecquivalent) and rest mass is rest to earth (gravitation) mass. Restmass becomes relative then because the point of perspective becomes relative and involved (as any particular point of view).

Does or would such a shift to not a particularly prefered point of perspective change the way the question can be responded to ?

If "what properties does energy have instead of inertia ?" is the question a simple response would be: "it has no properties".
If that,s a problem then it,s - apparently - a problem that no properties would imply no effect possible. It shows an identification (confusion) between properties and effect. There is no proof (or provabillity) for such an idea.

Other questionable idea is that inertia is a property. Being patience is "being patient" or "having patience". Verb expressions nothing to do with properties. Is inertia a property of things then ?

It seems to be for some. But Einstein stated energie and inertia as ecquivalents (not as identicals or the same).
Not just for a relative part.  14. Originally Posted by Sealeaf Inertia is a quality or characteristic of matter. Energy does not have inertia. Energy has wave length and amplitude and other characteristics that matter does not have.

Just because matter can be converted in to energy does not mean that the two have the same characteristics. For example: If you can sell a horse for \$500, then one horse = \$500. Both the horse and the money have value but the horse has life and the money will gain interest if you put it in a bank. Just because something can be converted into something else does not mean it has the same characteristis.
This is quite right, however i couldn't resist the urge to nit pick on one point.
Wavelength and amplitude are characteristics of systems such as photons, which of course transfer energy between systems in an electromagnetic interaction. However i would argue that photon's are energetic, as opposed to energy. I say this because, from the view point of quantum mechanics, photons are systems who's observables are energy, wavelengths can be calculated from these measurements of energy. So photon's have wavelength, as does matter actually (See Debroglie Wavelength), but energy on the other hand is just the amount of work required to make a specified change in the state of a system.  15. this thread has become complex. i cant understand final 4 posts  16. Energy in its most basic for is the ability of matter to interact with other medium or have a potential to alter its current state - in the cause of inertia, we can say that if an object is capable of changing its own or another objects course of motion, according to the laws of Newtonian physics. However, to adjust Einstein's two theories of gravity and relativity, we must alter this definition of energy to deal with two simple and proved facts. 1. Time is not absolute. It is affected by motion, or energy transfer through a medium. 2. The speed of light is a universal speed limit. However, for the understanding of energy in a basic and correct form (excluding atomic and terrestrial levels of scale), the first definition is satisfactory.  17. Matter is held together by forces.

A force is an energy.

Two particles held together by a force have a greater mass than the same two particles individually.

The extra mass comes from the force holding them together. If I split them the force holding them together is released as energy.  18. Energy does have inertia when it's inside the nucleus.

Matter isn't converted into energy per se.

The force that holds matter together is converted into energy.  Bookmarks
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