Re: defining laws in isolation or 'no other force acting'
<hibbsa-/[email protected]> 21 Jan 2014 21:08:01 -0800
| Newsgroups | gmane.science.physics.fabric-of-reality |
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| Message-ID | <[email protected]> |
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<p><p></p><div class="ygroups-quoted"><br><br>---In [email protected], <garyo@...> wrote:<br><br><div id="ygrps-yiv-399508818">On Sun, Jan 19, 2014 at 2:26 AM, <<a rel="nofollow" target="_blank" href="mailto:hibbsa@...">hibbsa@...</a>> wrote:<br>
<br>
<blockquote><span title="ireply"> > the reasoning seems to reverse quite easily, such that the second law<br>
> derives from the first.<br>
<br>
<br>
</span></blockquote>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</div><div> </div><div>You might be tempted to kick yourself when you your brain realizes it's true before I can finish writing that "you got the problem right but the wrong context" as "F -> a" is the right relationship, but the way it could be in terms of "a" is the trivial context, and "m" is the intractable problem. </div><div> </div><div>But there's a reason why you couldn't choose "m" even though "F -> a" , is literally substituting "m" for "->" (i.e. relationship) in a context that you've probably known since you were about 8. </div><div> </div><div>But the intractability of "m" is that in the history of the end to end reasoning, "m" never e
xisted, and there was never a way to bring it into existence. </div><div><var id="yui-ie-cursor"></var> </div></div></p>
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