http://physics.info/kinematics-calculus/
The third equation of motion relates velocity to displacement. By logical extension, it should come from a derivative that looks like this …
dv = ??
dx
But what does this equal? Well nothing by definition, but like all quantities it does equal itself. It also equals itself multiplied by 1. We'll use a special version of 1, dt/dt, and then do a bit of special algebra — algebra with infinitesimals. Look what happens when we do this. We get a derivative equal to acceleration and another equal to the inverse of velocity.
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THE EQUATION V = V0 + AT IS FALSE as a field equation
by Miles Mathis
In a recent paper on the muon
1, I showed that this equation doesn't work when v0 is equal to c. It doesn't work when we have a particle with a very high velocity being accelerated by a gravity field. In that case the equation is vf = v0 + 2v0
2t. Why?
Then we add the initial velocity. That's it. The equation is basically a definition of acceleration. But in a recent paper on the calculus and variable acceleration2, I showed that the equation can actually be calculated from the time derivative.
v = a[d(t
2)]/2 = at
The 2 in the denominator comes from the halved first interval, which we must take into account in any acceleration.
So we have confirmed that part of the equation. The problem must be with the way the initial velocity and the acceleration stack up in a field. Apparently we can't just add the final velocity from the acceleration to the original velocity. Again, why?
Put simply, the reason is because if we have an initial velocity meeting an acceleration field, we have three velocities. Let us start with just the acceleration field, and no initial velocity. Let us say you have a gravity field, or any other acceleration field that creates a normal or squared acceleration. If you place an object in the field, the object will be given two simultaneous velocities. That is what an acceleration is, after all. If the object has one velocity, it has no acceleration. If it has an acceleration, it must have more than one velocity over each interval or differential. A squared acceleration, or an acceleration to the power of 2, is composed of two velocities. Therefore an object placed in any acceleration field will be given two velocities.
OK, but now we take an object that already has a velocity of its own, and we fly it into that acceleration field. It must then have three velocities over each interval. Or, to say it another way, it now has a cubed acceleration. It has three t's in the denominator.
For this not to be the case, we would have to break Newton's first law. If we don't include the initial velocity in each differential of acceleration, that means the acceleration field has somehow negated that velocity during the time of acceleration. The field would have to stop the object, then accelerate it, then give it its original velocity back at the end. Of course all that is impossible and absurd. No, the field would have to keep the initial velocity in every differential of acceleration, meaning that it would be accelerating the velocity, not the object.
Now maybe you see the problem with the equation in the title. It does not include a cubed acceleration. The “a” variable stands for a squared acceleration. The equation includes three velocities, but the first velocity has not been integrated into the acceleration. It is only added, as a separate term. But that is not the way the real field would work. The real field would accelerate the initial velocity, not just the object. As it is, the initial velocity is not summed in every differential, as it should be; it is only summed outside the acceleration. That cannot work, either as a matter of calculus or as a matter of physics. The equation is wrong, in any and all cases where a field is involved.
I will show that the reason is because the equation in the title is false as a field equation. It only works when the acceleration is not a field. It works only when the acceleration is an internal acceleration, as with a car.
In textbooks, the equation in my title is derived like this:
a= v/t
v= at
Then we add the initial velocity. That's it. The equation is basically a definition of acceleration. But in a recent paper on the calculus and variable acceleration2, I showed that the equation can actually be calculated from the time derivative.
...
A reader has pointed out to me that the dimensions appear to be off in that final equation. What causes it is that I am multiplying a distance by a distance, which appears to give us a distance squared. Go back two steps and you will see what I mean. But a distance times a distance is not a distance squared, if they are in line. A distance times a distance is a distance squared only in the case that the two distances are orthogonal, so that we have a square or something. A distance times a distance in line cannot be a distance squared anymore than a distance plus a distance can be a distance squared. This is another mainstream misunderstanding.
I have used algebra here to solve, but notice that if we use integration, we get the same problem: ∫(2x + y)dx = x(x + y). We integrate a sum but get meters squared.
This problem ties into the historical problem of velocity squared versus acceleration. Physics has never been clear about the mechanical difference. One has meters squared in the numerator and one does not, but are they really different? No. A square velocity IS an acceleration, by definition, so if we are getting different dimensions it is by ignoring some mechanics. We see that in this problem very clearly: if we multiply a velocity times a velocity in a field, we should get an acceleration. Therefore the extra length in the numerator is just that: extra. [You can now read more about this in a separate paper.]
http://milesmathis.com/voat.html
On the Windhexe: ''An engineer could not have invented this,'' Winsness says. ''As an engineer, you don't try anything that's theoretically impossible.''