Yahoo Answers: Answers and Comments for F = ma, but why mass isn't dependent on force? [Physics]
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From Anonymous
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Sun, 19 May 2019 09:44:30 +0000
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Yahoo Answers: Answers and Comments for F = ma, but why mass isn't dependent on force? [Physics]
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From Luca: 1) That formula is only an approximations, it ...
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Sun, 19 May 2019 10:26:13 +0000
1) That formula is only an approximations, it only works with things that aren't too fast, or too small (or both).
2) Cause it doesn't. Not much we can say, Nature behaves like this: we find that there's a linear relation between the force applied on a body and its acceleration, we call the proportionality constant "mass" and, by definition, the mass define the inertia of an object (that is, its resistance to acceleration when pushed by a force).
3) There are some certain scenario in physics in which mass isn't constant or it's not a scalar and it can behave weirdly. In particular in certain crystals, electrons and holes move AS IF they had an "effective mass" that is different from their usual mass. This effective mass can be negative (the electron moves backward when pushed forward), can change with the parameter of the crystal and can be a tensor (a matrix, so that the effect of the force depends on the direction of application), thus creating some really strange phenomena.
4) In relativity some people will say that mass changes with speed and so we can somehow say that m depends on the force, but the "mass changes with speed" thing is really old and not used anymore, it's not a really useful concept and it does create a lot of confusion with little gain. Nowdays with mass in relativity people mean "rest mass" and this is constant (in closed systems) and invariant (so all observers agree on the value of the rest mass).

From Raghavendran: Mass is dependent on velocity and not force.
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Mon, 20 May 2019 15:55:40 +0000
Mass is dependent on velocity and not force.

From Jeffrey K: Newton's true equation is F =dP/dt This me...
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Mon, 20 May 2019 02:06:21 +0000
Newton's true equation is F =dP/dt This means force equals the rate of change of momentum. Momentum P = mv If we assume mass is constant, the formula becomes F = ma. This assumption that mass is constant is true in most common situations. But not always.

From Andrew Smith: The fact that two things are related has nothi...
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Sun, 19 May 2019 17:56:09 +0000
The fact that two things are related has nothing to do with a physical dependence.
The dependence in the formula as written is that the FORCE is dependent on the product of the provided mass and acceleration.
If you rewrite it to m = F/a then you imply a dependence but the wording becomes "the mass REQUIRED is equal to the quotient Force divided by acceleration"
It does not magically create mass.
In other words mathematics can express many things. What it cannot do is to express the real world and the entire problem. It is up to YOU to provide the interpretation ( if any exists) for the equation you create.

From Old Science Guy: ...
the equation is more properly
a = F / m
wh...
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Sun, 19 May 2019 16:24:16 +0000
...
the equation is more properly
a = F / m
where a is the dependent variable
and F and m are independent variables
When you get a good response,
please consider giving a best answer.
This is the only reward we get.

From Vaman: Actually mass can depend on the force, Actual ...
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Sun, 19 May 2019 14:09:44 +0000
Actually mass can depend on the force, Actual equation is d/dt p=force. p is the momentum, Your equation is valid only when m is a constant.

From Goldy Aluminy: Perhaps you are confusing mass and weight. Mas...
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Tue, 21 May 2019 15:10:41 +0000
Perhaps you are confusing mass and weight. Mass is a measure of amount of "stuff" there is, which is expressed in grams. Weight is a measure of the force a mass exerts in the presence of gravity or acceleration and is expressed in grams. You can think of gravity as an accelerating force.
In other words, just because there is no gravity, does not mean that objects don't have a mass. They might be weightless, but not massless (Conservation of mass concept).

From Luke: It is. The equation works forwards as well as ...
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Mon, 20 May 2019 01:07:41 +0000
It is. The equation works forwards as well as backwards.

From busterwasmycat: normally, we chose the object first. mass is ...
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Sun, 19 May 2019 14:32:18 +0000
normally, we chose the object first. mass is dependent on the object. There are situations where the mass "depends" on the force, in the sense that you cannot have a specific acceleration without a particular mass for a force.
But normally, the issue is one of perspective. We are concerned with an object, and that object is what it is, including its particular mass.

From oldschool: Mass is constant when V << c
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Sun, 19 May 2019 12:18:49 +0000
Mass is constant when V << c

From goring: Force does not exist by itself. The Newton equ...
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Tue, 21 May 2019 20:36:48 +0000
Force does not exist by itself. The Newton equation of gravity Force is composed as follows;
Force = Fo x F' x(1/Fu).
Where Fo & F' are structural force of of the interacting masses and Fu is a structural force that is universal.
Thus all masses have a gravitational structural force.
When two masses collide two forces are born. That means there is a collusion yielding forces that are equal and opposite in direction.
Hence forces are born in pairs
Note; there are four forces in Newton gravity equation where as Einstein gravity equation only indicates the ratio of two forces

From CarolOklaNola: Mass is an intrinsic quality of matter because...
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Sun, 19 May 2019 10:16:48 +0000
Mass is an intrinsic quality of matter because of the strong and weak nuclear forces. Force does not have to exist for matter and mass to exist. Energy and mass are interchangeable, BUT the process is VERY inefficient because of entropy and the strong and weak nuclear forces. The force is there at the subatomic quark scales of size.
E = mc^2 = hv
h = Planck constant
v = frequency
There is no term for force for energy. Energy is NOT necessarily mass dependent.