ForumsWEPRPhysics Questions

15 2672
jaza_m
offline
jaza_m
1,356 posts
Nomad

Ok, So If something goes faster and faster, the weight increases, right? If this true, then what happens if the object going on the speed of light has NO weight. Would It increase in mass?

Another question, Me and my friend where talking about this, When two particles travelling in different directions, it is seen that one gets all the velocity and the other has none. So If you have two objects travelling in different directions at the speed of light, one would get double the speed of light. But this isnt possible. So the mass of something has to increase.He also said something about the equation (0.5*mass x Velocity^2) having to account for the gained energy if momentum is increased exponentially. So if you travel at faster then the speed of light, you stay the same speed, but velocity cant so the mass of something has to increase. So you gain weight.

Me and My friend where talking some time ago about the second question. If you want the conversation, I can post it, because I dont get some of it, which is why im asking. And I doubt I worded any of that correctly.

  • 15 Replies
Einfach
offline
Einfach
1,448 posts
Nomad

So If something goes faster and faster, the weight increases, right?


I think you're confusing the idea of g-force. Its weight increases, but the mass does not change.

But I've never taken a formal physics course...
phsycomonkey
offline
phsycomonkey
789 posts
Nomad

Another question, Me and my friend where talking about this, When two particles travelling in different directions, it is seen that one gets all the velocity and the other has none. So If you have two objects travelling in different directions at the speed of light, one would get double the speed of light. But this isnt possible. So the mass of something has to increase.He also said something about the equation (0.5*mass x Velocity^2) having to account for the gained energy if momentum is increased exponentially. So if you travel at faster then the speed of light, you stay the same speed, but velocity cant so the mass of something has to increase. So you gain weight


I think once you have reached the speed of light, there is no more speed to be gained, therefore the speed would either cancle out the other one but stay the same, or they would both continue the same speed
My theory is not very well backed up by tests or info, so it's more of a guess or idea
Squidbears
offline
Squidbears
626 posts
Nomad

what happens if the object going on the speed of light has NO weight.

i think that everything that can move has weight
Einfach
offline
Einfach
1,448 posts
Nomad

He also said something about the equation (0.5*mass x Velocity^2)


This is the formula for kinetic energy

if the object going on the speed of light has NO weight


Photons can't have any weight, because their energy is determined solely by their wavelength, and an infinitely long wavelength means no energy, meaning they can't have any mass because for an object with any mass to collide with another object, with one of the objects traveling at the speed of light, then that would release a lot of energy.
Moe
offline
Moe
1,714 posts
Blacksmith

i think that everything that can move has weight


The only known thing that can reach the speed of light is light, which has no mass being its not really a particle or a wave but some kind of combination.
phsycomonkey
offline
phsycomonkey
789 posts
Nomad

The weight part I will have to agree with Einfach. I don't think that's right, it gains more force? (I miss your bunny Einfach)

The only known thing that can reach the speed of light is light, which has no mass being its not really a particle or a wave but some kind of combination.


I'm not sure that's entirely true, but no object i no of that can has a mass making your statement stand
Einfach
offline
Einfach
1,448 posts
Nomad

I'm not sure that's entirely true, but no object i no of that can has a mass making your statement stand


He's referring to the photon, which I explained cannot have any mass because its energy is determined solely by its wavelength (and Planck's Constant).
phsycomonkey
offline
phsycomonkey
789 posts
Nomad

He's referring to the photon, which I explained cannot have any mass because its energy is determined solely by its wavelength (and Planck's Constant).


Thank you
Squidbears
offline
Squidbears
626 posts
Nomad

If i remember what i learned in chemistry like last week.. then energy and wavelength are inversely related? and energy and frequency are directly proportional?

Einfach
offline
Einfach
1,448 posts
Nomad

If i remember what i learned in chemistry like last week.. then energy and wavelength are inversely related? and energy and frequency are directly proportional?


Yes - I explained it above...
driejen
offline
driejen
486 posts
Nomad

Ok, So If something goes faster and faster, the weight increases, right? If this true, then what happens if the object going on the speed of light has NO weight. Would It increase in mass?

I don't know about increasing mass, but it certainly requires more and more energy to accelerate a non-zero mass object the closer it is to the speed of light.

Another question, Me and my friend where talking about this, When two particles travelling in different directions, it is seen that one gets all the velocity and the other has none. So If you have two objects travelling in different directions at the speed of light, one would get double the speed of light. But this isnt possible.

According to special relativity, the frame of each object has an effect on the relative velocities which become more apparent when you are dealing with very high speeds and a more complex operation other than just addition of velocities is required and stops relative velocities from exceeding c. I don't really understand the concepts behind it but if you are interested you can look into the velocity-addition formula.
phsycomonkey
offline
phsycomonkey
789 posts
Nomad

Photons can't have any weight, because their energy is determined solely by their wavelength, and an infinitely long wavelength means no energy, meaning they can't have any mass because for an object with any mass to collide with another object, with one of the objects traveling at the speed of light, then that would release a lot of energy.


He explained it here
Squidbears
offline
Squidbears
626 posts
Nomad

I'm tired... and not really thinking very well at the moment

phsycomonkey
offline
phsycomonkey
789 posts
Nomad

I'm tired... and not really thinking very well at the moment


I understand, I have had those moments too, I am getting tired now anyways, try not to get into things you have to think hard about and it'll be nice lol
Einfach
offline
Einfach
1,448 posts
Nomad

For the first time, probably in WEPR history, the first two threads are "Questions" and "Complaints."

Showing 1-15 of 15