Re: defining laws in isolation or 'no other force acting'
<hibbsa-/[email protected]> 04 Feb 2014 21:20:32 -0800
| Newsgroups | gmane.science.physics.fabric-of-reality |
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| Message-ID | <[email protected]> |
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<p> <br>
<br>
---In [email protected], <garyo@...> wrote:<br>
<br>
> On Wed, Jan 22, 2014 at 12:08 AM, <hibbsa@... mailto:hibbsa@...> wrote:<br>
><br>
>><br>
>><br>
>><br>
>><br>
>> ---In [email protected] mailto:[email protected], <garyo@...> wrote:<br>
>><br>
>><br>
>> On Sun, Jan 19, 2014 at 2:26 AM, <hibbsa@...> wrote:<br>
>><br>
>>>> the reasoning seems to reverse quite easily, such that the second law<br>
>>>> derives from the first.<br>
>>><br>
>>><br>
>>> The first law doesn't specify the relationship between force and<br>
>>> acceleration (except that there is one). For instance, F=m*a^2 would also<br>
>>> lead to bodies at rest staying at rest and bodies in motion staying in that<br>
>>> state of motion. (There's no acceleration in either case.) So you can't<br>
>>> derive the second law from the first, only the other way.<br>
>>><br>
>>> --<br>
>>> Gary<br>
>><br>
>> You might be tempted to kick yourself when you your brain realizes it's<br>
>> true before I can finish writing that "you got the problem right but the<br>
>> wrong context" as "F -> a" is the right relationship, but the way it could<br>
>> be in terms of "a" is the trivial context, and "m" is the intractable<br>
>> problem.<br>
>><br>
>> But there's a reason why you couldn't choose "m" even though "F -> a" , is<br>
>> literally substituting "m" for "->" (i.e. relationship) in a context that<br>
>> you've probably known since you were about 8.<br>
>><br>
>> But the intractability of "m" is that in the history of the end to end<br>
>> reasoning, "m" never existed, and there was never a way to bring it into<br>
>> existence.<br>
>><br>
>><br>
> Sorry, I have absolutely no idea what you're talking about here.<br>
<br>
<br>
My bad - I'm not sure what I said either :O) <br>
<br>
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