Fall Duration Calculator: Objects of Different Mass from 10m to 2m

[Janus]

Hello Dale

What i found is correct. Don't it?
And i come back with my conclusions. Whish are also correct. Following to me.
And may be, i am wrong. May be.

If we have the Earth. And nothing change about its. And there is an object of 100 kg that falls on it. It take more time than a object of 500 kg. I must be specific. Same height, Exactly same Earth. The same conditions. And the objects didn't come from the Earth. Aristote was rigth in - 350...
We have the Earth. And we take something from the Earth. And let its fall. Always from the same height. No matter the mass we take from the Earth to let its fall. It takes always the same time. And in 1600, Galilée was rigth in 1600.

But.

Now people think that all the objects fall on the Earth in the same way. And this is not correct.

Luc B.

In your examples, both the 100 kg object and the 500 kg object fall at the same rate. The difference in the time that they would take to strike the Earth is due to the difference in the rate the Earth falls towards a 100 kg object vs. a 500 kg object. The acceleration of both the 100 kg and 500 kg object will be 9.8 m/sec². The acceleration of the Earth will be 1.64e-22 m/sec² with the 100 kg object and 8.2e-22 m/sec² with the 500 kg object. Assuming a 100 m distance between ground and objects, the Earth will "fall" ~ 7.4e-22 m with the 100kg object and ~ 3.7e-22 m with the 500 kg object.
Both distances are extremely small (both are much smaller than even the radius of a single proton.)

But what happens if you drop them together side by side? Would the 500 kg object hit sooner (even if by only the tiniest amount)?, as Aristotle would have claimed? . No. both objects would again accelerate towards the Earth at 9.8m/sec². The Earth however cannot accelerate towards one object at a different rate than it does the other. Instead, it accelerates toward both objects at an rate determined by the sum of the masses of the two objects.

As an aside, the fact that dropped alone, a 100 kg object would hit a in infinitesimally longer time than a 500 kg object would is not a validation of Aristotle, as he believed that the 500 kg object would have taken a significantly shorter time to complete the fall.

 

[Luc B]

Hello Janus
You are right. Like you are also riht for Fresnel's spot.(He might see a thin ring of light surrounding the disk.)

But i am very interested for a reply of Mr Dale. About what laws have been used by Aristote?
And how Galileo had used the laws of Newton. A trip to the future?
He has said that i am wrong. Perhaps, he is right

Luc B.

 

[Dale]

Aristote didn't use any law.

And therefore he cannot be either right or wrong about the result of any calculation. Your conclusion regarding him is illogical.

Galilée ... He had also no law for the gravitation effects

Then he also can neither be shown right or wrong by a calculation or experiment. So again your conclusion is illogical.

Your conclusions are NOT correct.

I don’t recall making any conclusions.

He has said that i am wrong.

I didn’t say that you were wrong. I said that your argument is illogical. Irrespective of the correctness of the conclusion itself the conclusion does not follow logically from the computation.

 

[Luc B]

Hello Dale

I have written in the post Duration of a fall. Friday at 10:38 PM: Reply 45 :
"And i come back with my conclusions. Whish are also correct. Following to me.
And may be, i am wrong. May be"

And you reply: Reply 47
" I don’t think so. You state your conclusion as a contest between people. As though they were wrestling or something and there can only be one winner.
Your conclusions are not only poorly stated as a personal contest, but they are also not logically connected to the calculation. A correct analysis would be to start with the same experimental scenario, identify the laws used by each person, determine the prediction for each, and compare the predictions to the actual results of the experiment.
The classical result is reached by using both Newton’s 2nd law and Newton’s law of gravity, so the conclusion clearly agrees with Newton. As far as I know, Galileo also used Newton’s laws, but I don’t know what laws Aristotle used."

AND NOW. In the reply 53, you wrote:"I don’t recall making any conclusions." End of quote

Do you know how important is Galilean reasoning in the history of physics?
Reasoning that is still relevant today.
You are on the other side of the Atlantic. In a country that has become one of the great actors of the world. If not the most important.
Do you know that Italy was in Galileo's time?
And that France - it's not my country - was one of the countries where the great ideas of physics were shaped.
Sadi Carnot was French, Rudolf Clausius was German. But it is in Paris that he made these greatest conferences. Langevin, in 1911, in Bologna, Italy, gives his presentation in French .....
And Newton was English. It was translated during his lifetime. In French.

You conclude, it seems to me. When you say that Galileo used Newton's laws. It is temporally impossible.
But that means that you are a human being. And that you can go wrong. And rectify your mistakes.
But you do not remember having concluded.
This is a well-known phenomenon in the field of human behavior. Finally, if you accept this science as accurate.

Your "from here" writings are already available somewhere on the internet. I think you have the power to exclude me from this forum. I will defend myself with the means you will leave me.

Luc B.

 

[davenn]

You conclude, it seems to me. When you say that Galileo used Newton's laws. It is temporally impossible.
But that means that you are a human being. And that you can go wrong. And rectify your mistakes.
But you do not remember having concluded.
This is a well-known phenomenon in the field of human behavior. Finally, if you accept this science as accurate.

Your "from here" writings are already available somewhere on the internet. I think you have the power to exclude me from this forum. I will defend myself with the means you will leave me.

Luc B.

Luc
As an outsider reading through this thread, it has become very clear that...
you really need to stop talking and start listening to what is being said by the three people that have been responding to you
You have three very bright and well educated people trying to help you out and you are ignoring this help.
You would do very well to take what they are saying on the subject and start to understand it and to put you misunderstandings aside

If they ask you a question ( as has been done often), answer it specifically, DONT go off rambling about unrelated/irrelevant stuff ( as you have done often), clearly answer the question in a short and precise response.


regards
Dave

 

[Dale]

You conclude, it seems to me. When you say that Galileo used Newton's laws.

That was an (incorrect) assumption, not a conclusion.

I have no interest in the history. My point is that your stated conclusions are not logical. No amount of history lessons change that.

But that means that you are a human being. And that you can go wrong. And rectify your mistakes.

Sure. My assumption was wrong. Mistake rectified.

Now, will you rectify your mistake? To do so you could admit that your conclusions do not logically follow from your calculations, or you could show the laws used and their incompatibility with the calculation or the experimental evidence.

And what is with all of this obsession over nationalities? It is weirdly inappropriate for this forum.

 

[Luc B]

Hello Mr Davenn
Gold member

I have three very bright and well educated people trying to help me. Ok thanks for them.
I stop talking and writing here.
I take the last conclusions i have read as true.
Galileo use the law of Newton. That's all. OK OK OK. That's right.
I apologize for my ignorance.Sorry.

Luc B.

Post scriptum.
I have well read: reply 56 : That was an (incorrect) assumption, not a conclusion.....
There are a lot of assumption in physics which are not verified. But sure, i am wrong. Of course.

 

[Luc B]

Hello

I rectify my mistake; You are rigth Mr Dale
And if YOU use the laws of Newton. And there are: F=G.m1.m2/d² F12=F21= m1.a1=m2.a2
You will find the same time for every falls that have the same distance.
That are, i think, your logical conclusions.
And sure, there are right.

Thank you for your precious opinion

Luc B.

 

[Luc B]

Hello Mr Devann

I have three very brillant people who try to help me.
Ok. I have understood that.
And it is an obviousness for you that i have to change my raisonning.
But
You don't know anything about me.
If you read carefully, one of those brillant people made a mistake.
But no matter. They ARE brillant people...

When Don Christobal (Colomb) wanted to go trough atlantic ocean,
Very important people said him:" Eh Christobal. It is well knowed that it is impossible to cross the atlantic ocean
Don Christobal went trough atlantic ocean. AND CAME BACK.
But your continent is not called "Colombia'. But America. From Amerigo Vespucci.

Luc B

 

[Dale]

And if YOU use the laws of Newton. And there are: F=G.m1.m2/d² F12=F21= m1.a1=m2.a2
You will find the same time for every falls that have the same distance.

No. Remember that these equations are only valid in an inertial frame.

 

[CWatters]

A correct analysis would be to start with the same experimental scenario, identify the laws used by each person, determine the prediction for each, and compare the predictions to the actual results of the experiment.

That's a very good idea. You would need to design your experiment carefully because the differences in the predictions can be very small. They would be too small to show up in the experiment you proposed in #1 and #8.

Both Newton's and Einstein's laws predict that the gravitational force of the sun will bend the light from a star passing near the sun on it's way to Earth. This would make stars appear to be in the wrong place as the sun passes in front of them. Einstein's General Relativity predicts the light will bend twice as much as Newton so you have a way to test who is correct.

The experiment to see which was correct was first done in 1919 by Eddington and showed Einstein was correct.

https://thethoughtstash.wordpress.com/2011/01/03/how-eddington-demonstrated-that-einstein-was-right/

 

[DrClaude]

The OP in no longer with us. Time to close the thread.