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## Main Question or Discussion Point

I apologize in advance if this is supposed to go in the homework section, but this is not homework, it is just my inability to grasp the topic no matter what textbook I read.

So, here is my question. I have been taught 4 formulas for

[tex]F = \frac{GMm}{r^{2}}[/tex]

[tex]F = \frac{kq_{1}q_{2}}{r^{2}}[/tex]

[tex]g = \frac{GM}{r^{2}}[/tex]

[tex]E = \frac{kq}{r^{2}}[/tex]

And 6 formulas for

[tex]\Delta V = \frac{\Delta E_{p}}{m}[/tex] & equivalent for

[tex]V = - \frac{GM}{r}[/tex] & positive equivalent for

[tex]g = - \frac{\Delta V}{\Delta r}[/tex] & equivalent for

Now I'm sorry if I just fired 7 formulas at you guys and expected you to explain them, I know what they do, its just that

Again sorry, but if anyone would take the time to explain the formulas in practical terms, I would be eternally grateful, seriously.

Alternatively, if anyone knows any good online resource, a link would be great! (I already tried to google it, but results were vague and poorly explained)

So, here is my question. I have been taught 4 formulas for

**"Fields and Forces"**[tex]F = \frac{GMm}{r^{2}}[/tex]

[tex]F = \frac{kq_{1}q_{2}}{r^{2}}[/tex]

[tex]g = \frac{GM}{r^{2}}[/tex]

[tex]E = \frac{kq}{r^{2}}[/tex]

And 6 formulas for

**"Motion in Fields"**[tex]\Delta V = \frac{\Delta E_{p}}{m}[/tex] & equivalent for

*q*instead of*m*

[tex]V = - \frac{GM}{r}[/tex] & positive equivalent for

*q*where*G = k*and*k =*[tex]\frac{1}{4 \pi \epsilon _{0} r}[/tex][tex]g = - \frac{\Delta V}{\Delta r}[/tex] & equivalent for

*E*but instead of [tex]\Delta r[/tex] it gives me [tex]\Delta x[/tex]Now I'm sorry if I just fired 7 formulas at you guys and expected you to explain them, I know what they do, its just that

**their symbols confuse me,****which is which?**and especially when to use r^2 and when to use the formula without the r^2 on the bottom.Again sorry, but if anyone would take the time to explain the formulas in practical terms, I would be eternally grateful, seriously.

Alternatively, if anyone knows any good online resource, a link would be great! (I already tried to google it, but results were vague and poorly explained)

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