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Author: Subject: Relatively simple yet useful physics equations
Solomon
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[*] posted on 15-7-2013 at 13:00
Relatively simple yet useful physics equations


What are some relatively simple but very useful physics equations? (ex: F=MA, E=mc2, g=9.8m/s2, etc...)

[Edited on 7-15-2013 by Solomon]

[Edited on 16-7-2013 by ScienceSquirrel]
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[*] posted on 15-7-2013 at 13:09


Quote: Originally posted by Solomon  
F=MA, E=mc2, g=9.8m/s2, etc.
Not even wrong.

Questions are followed by '?'.

Try <a href="http://lmgtfy.com/?q=Physics+for+Dummies&l=1" target="_blank">here</a> <img src="../scipics/_ext.png" />.

[Edited on 7/15/13 by bfesser]




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[*] posted on 15-7-2013 at 13:11


Ohm's Law - Electricity

E = I x R  (Voltage = Current x Resistance)

R = E / I  (Resistance = Voltage / Current)

I = E / R  (Current = Voltage / Resistance)





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Solomon
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[*] posted on 15-7-2013 at 13:17


any more?
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[*] posted on 15-7-2013 at 13:20


Give it some time, man! This isn't IRC!



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[*] posted on 15-7-2013 at 13:20


Of course, there are hundreds, you might as well just learn them as you need them. I listed ohm's law because I use it everyday.



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Solomon
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[*] posted on 15-7-2013 at 13:27


Neat Los Alamos report on critical mass calculations in the attachment. Wish I knew what a few of the variables meant and what units they are measured in. As I have not yet taken a physics or calculous class, unless all variables are given, it is a bit like attempting to read a pdf of a patent written in german. It would be appreciated if someone added text boxes next to the equations to explain some of the variables (units, meaning, etc...).

[Edited on 7-15-2013 by Solomon]

Attachment: 00407447.pdf (781kB)
This file has been downloaded 339 times

[Edited on 7-15-2013 by Solomon]

[Edited on 7-15-2013 by Solomon]
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[*] posted on 15-7-2013 at 15:22


Quote: Originally posted by Solomon  
What are some relatively simple but very useful physics equations (ex: F=MA, E=mc2, g=9.8m/s2, etc...)?

[Edited on 7-15-2013 by Solomon]


Just a few corrections...

You can't write F=MA. M is not mass and A is not acceleration. M is moment of force and A is usually the surface.

The super correct way would be putting them in italics, but it is not really needed when writing equations on forums as it's tedious and takes time. It's just a nice touch as it's the correct way because physical units are in italic, and physical quantities are not. Lowercase is obligatory.

Also, E=mc^2 or E=mc<sup>2</sup>, not E=mc2. The difference is huge.

If you want a more neat (also a correct) look, write units separated from the numbers. Therefore, 10 kg, not 10kg.

It's a good thing to practice writing without "/" as it is being phased out, and it's already not accepted by SI.
Therefore, m*s<sup>-2</sup>, J*mol<sup>-1</sup>*K<sup>-1</sup>, not m/s<sup>2</sup> and J/mol*K.
You can leave the asterisk, but then be sure to use space to avoid cluttering. (J mol<sup>-1</sup> K<sup>-1</sup>;)

Forcing yourself to accept these basic rules is a good thing to do.

[Edited on 15-7-2013 by Endimion17]




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[*] posted on 15-7-2013 at 15:52


You can use &amp;times; for &times; and &amp;divide; for &divide;. Or copy-paste them from another page or your character map.



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[*] posted on 15-7-2013 at 18:20


Thank you Endimion17. I am guessing you are trying to get on my nerves bfesser with your idiotic comments and messages. Just so you know, I am only 15 and have spent almost every waking minute learning so give me a chance to do it! Furthermore, stop your dumb ass comments and I propose a contest between us involving complex problem solving skills and we will see who truly is greater! I would love it if learning would be made about 0.00003% faster by you putting forward useful comments (if you can think of any).

[Edited on 7-16-2013 by Solomon]
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[*] posted on 15-7-2013 at 18:27


I'm <em>not trying</em> to get on your nerves, so settle down.



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[*] posted on 15-7-2013 at 18:46


Good. This brings me to another question: were you a. attempting to say that I am unintelligent (trust me I can prove otherwise) or b. messing with me? News flash 2 stars now. I am curious, are you really a wikipedia staff member or in any other way related to wikipedia or were you named that because you comment a lot? I commented a while back that these stars by our names are "eerily accurate", I just learned a method of chloroform synthesis that I have all the chemicals need for at home right now. Hence being a hazard to myself... just a random and eerie thought. What if I did make chloroform... terrifying myself. What if I put this in an episode of the big bang theory as one of Sheldon's fear/paranoia days. What if this a repeat of Myfanwy94 (kid who died from phosgene synthesis) fear, fear, fear, fear, FEAR. Tangent....

[Edited on 7-16-2013 by Solomon]

[Edited on 7-16-2013 by Solomon]
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[*] posted on 15-7-2013 at 19:13


I'm not even going to respond to that.

You've dragged your own thread way off-topic. I don't see this going anywhere productive. Sorry.

<strong>chemcam</strong> & <strong>Endimion17</strong>, thanks for your contributions.




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