Inertia at Subatomic Levels: Proton Quarks?

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In summary, the bar would not move until at least 1 second has passed because otherwise it would move faster than the speed of light. This is also the reason that it takes time for the other end of the bar to move.
  • #1
BernieM
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I have a bar of metal 1 light second long and if i push it at one end it can not move at the other end until at least 1 second has passed because otherwise it would move faster than the speed of light. A .1 light second long bar .1 seconds later before the other end may move, and smaller and smaller and smaller etc., until finally we are the size of an atom. Does the same principle apply here? At subatomic levels such as a proton? Quark? Is this the cause of inertia or is it some other force that is manifesting itself?
 
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  • #2
Inertia is resistance of any physical object to a change in its state of motion or rest. This is NOT the same effect as your example is giving. The reason that it takes time for the other end of the bar to move is that the force that you are applying to the bar on one end takes time to propagate through the bar to the other end.

Inertia means that it takes MORE force or work to move something heavy than it does to move something lighter.
 
  • #3
BernieM said:
I have a bar of metal 1 light second long and if i push it at one end it can not move at the other end until at least 1 second has passed because otherwise it would move faster than the speed of light. A .1 light second long bar .1 seconds later before the other end may move, and smaller and smaller and smaller etc., until finally we are the size of an atom. Does the same principle apply here? At subatomic levels such as a proton? Quark? Is this the cause of inertia or is it some other force that is manifesting itself?

What you are referring to is a phenomenon that is called 'Born rigidity'. (Presumably Max Born was the first to discuss it thoroughly, so that later physicists started to name it after him.) An object that is in continuous acceleration is compressed in a way that has no classical counterpart.

It would not surprise me if in fact some theoretical physicist has explored an idea where inertia is linked with the tension that is accociated with Born rigidity.

For instance, check out the following discussion about http://www.mathpages.com/home/kmath422/kmath422.htm" [Broken]. Of course, such musings are sheer speculation.
 
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  • #4
Something else to keep in mind:

A pressure wave in a medium, during propagation, will effect loss.
This is usually presented by IR radiation as the medium molecules compress and decompress .
Thus, I highly doubt that a normal "shock wave" would even "get" to the end of such a long rod. As such, I doubt that the end of such rod would even move at all.

I would venture the same with considerations of a very slow moving pressure wave impact.
 
  • #5
The speed of sound in most metals at room temperature is of the order of a few km/sec.

Any force you applied at one end would propagate along the rod at the speed of sound, not at the speed of light.
 
  • #6
Perhaps I didn't state it quite right. Theoretically if i were able to push one end of a rod toward the other end, the other end could not move instantly because in doing so it would have violated the speed of light, so some time must pass before the other end may begin to move. On a subatomic scale, a particle (if it is not in a wave state), if it has 3 dimensions, would also be limited here, in that any force applied to 'one side' of the particle could not instantly make the other 'side' of the particle begin moving the same direction at that same exact instant ... or can it? Is this a quantum mechanical issue? I am not sure where to place this effect (if it even exists).
 
  • #7
Particles don't have sides, they are zero-dimensional points, and lack spatial extension.
 
  • #8
BernieM said:
Perhaps I didn't state it quite right. Theoretically if i were able to push one end of a rod toward the other end, the other end could not move instantly because in doing so it would have violated the speed of light, so some time must pass before the other end may begin to move. On a subatomic scale, a particle (if it is not in a wave state), if it has 3 dimensions, would also be limited here, in that any force applied to 'one side' of the particle could not instantly make the other 'side' of the particle begin moving the same direction at that same exact instant ... or can it? Is this a quantum mechanical issue? I am not sure where to place this effect (if it even exists).

I think you have the right idea. If you push on a couple of atoms, the one nearest to you would feel the force first followed by the others a short amount of time later. For this kind of distance the timescale is so small it's pretty much ignoreable. But for something like a 0.1 light year long bar it would definitely have an effect.
 
  • #9
Let's not forget that the propagation is not without loss, expressed in the form of heat dissipation, which reduces the strength of the propagating wave.
As such, a very long rod, struck(or pushed) at one end, might have zero response on the far end.
 

What is inertia at subatomic levels?

Inertia at subatomic levels refers to the resistance of an object to any change in its state of motion. It is a property of matter that causes it to resist changes in velocity or direction.

How does inertia at subatomic levels differ from classical inertia?

In classical physics, inertia is described as a property of macroscopic objects. However, at the subatomic level, particles such as proton quarks have different properties and behaviors that affect their inertia.

What factors affect the inertia of proton quarks?

The inertia of proton quarks is influenced by their mass, velocity, and interactions with other particles. The strong nuclear force, which holds quarks together, also plays a role in their inertia.

Can inertia at subatomic levels be measured?

Yes, scientists use particle accelerators and other experimental techniques to measure the inertia of subatomic particles. These measurements help us understand the fundamental properties of matter and the behavior of particles at the smallest scales.

How does the concept of inertia at subatomic levels contribute to our understanding of the universe?

Inertia at subatomic levels is a crucial aspect of quantum mechanics, which is the foundation of our current understanding of the universe. It helps us explain the behavior of particles and their interactions, leading to advancements in fields such as particle physics, cosmology, and technology.

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