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Reflector
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I was thinking, as speed increases, then mass also increases. So what if something has mass but no speed - will this cause it to have -ve velocity which we view as gravity corresponding to the mass of the object?
Reflector said:I was thinking, as speed increases, then mass also increases. So what if something has mass but no speed - will this cause it to have -ve velocity which we view as gravity corresponding to the mass of the object?
No. First you say that the mass increases by 5. Then you say I have mass 5. Those two statements, taken together, don't make sense to me.Reflector said:Okay. Say your moving near lightspeed. You go from speed A to speed B. Your mass increases by 5. Now say you have mass 5 and you are stationary. Now you go from speed B to speed A... '-ve velocity'. Get it?
There is a connection between relativistic mass and speed (not velocity). There is no connection between rest mass and speed.There is a connection between mass and velocity.
Please define yout terms. What is "ve"? What is "-ve"? What is "-ve velocity"? Please define these terms precisely. Otherwise they mean nothing.So if you have mass you need to have '-ve velocity'...
I've already explained to you that mass is not a function of velocity. It is a function of speed only. Speed is defined as the magnitude of velocity.Reflector said:You increase in mass when you increase your velocity, meaning positive velocity.
You're incorrectly assuming that m(v = 0) = 0. That is incorrect. While it is true that mass is a function of speed it does not mean that when the speed is zero then so is the mass. the height of a person under the age of 15 is a function of time difference between the current day and the day that person was born. Call that time difference the person's "age." Therefore the child's height is a function of age. That doesn't mean that when the child was born that their height was zero. Mass is related to the proper mass m0 (aka rest mass) asBut then if you already have mass and you are at rest atleast relative to another mass, then how did you get that mass in terms of the same idea that mass increases by speed increasing?
pmb_phy said:I've already explained to you that mass is not a function of velocity. It is a function of speed only. Speed is defined as the magnitude of velocity.
You're incorrectly assuming that m(v = 0) = 0. That is incorrect. While it is true that mass is a function of speed it does not mean that when the speed is zero then so is the mass. the height of a person under the age of 15 is a function of time difference between the current day and the day that person was born. Call that time difference the person's "age." Therefore the child's height is a function of age. That doesn't mean that when the child was born that their height was zero. Mass is related to the proper mass m0 (aka rest mass) as
[tex]m = \frac{m_{0}}{\sqrt{1-v^2/c^2}}[/tex]
Part of the mass, i.e. m0, is an inherent property of a body and the rest is a result of relativity (which means that it is a result of time dilation and Lorentz contraction).
The term proper here literally means "intrinsic".
Notice that when v = 0, m (v) = m(0) = m0. And that is not zero.
Pete
DW said:You have already been proven wrong on all this in this forum. Why are you still spamming for Planck?
Tom Mattson said:What--exactly--is wrong with pmb's post? I know that he's not adhering to the preferred convention of defining mass as the norm of the 4-momentum. But that's all it is: a convention. Conventions aren't "proven wrong". They are simply adopted or rejected based on their usefulness or lack thereof.
Gravity and negative velocity are inversely related. This means that as the force of gravity increases, the velocity of an object will decrease in the opposite direction.
Negative velocity can cause an object to slow down or move in the opposite direction of its initial motion. This is because negative velocity represents movement in the opposite direction of a reference point.
No, gravity does not have a velocity as it is a force, not an object. However, objects affected by gravity can have positive or negative velocity depending on their direction of motion.
Not necessarily. Negative velocity simply means that an object is moving in the opposite direction of the reference point. This could be forwards or backwards depending on the chosen reference point.
Negative velocity and acceleration due to gravity are both components of the same phenomenon - the motion of an object under the influence of gravity. Negative velocity is the object's speed and direction, while acceleration due to gravity is the rate at which the object's velocity changes due to the force of gravity.