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shouldn't F=-kx?

Ahh this my physics teacher went over

cool! Now you can explain it to me :)

the negative explains how that force is acting upon the spring

it depends on the what you're trying to find

Hmmm let's see|dw:1353379482698:dw|

|dw:1353379572781:dw|

well I guess we're stretching to a certain length, so the first figure?

I mean the first figure you drew

the figures are the same

it depends on whether you're trying to find the length of the spring or the position of the mass

if it asked abouthe spring itself it'd be negative

so since it's asking for position of the mass it's this|dw:1353379915405:dw|

why is it positive? because it is going in the direction that we designated as positive?

yes

OH I see!
|dw:1353380068540:dw|
Like so?

Now I can say that F=kx

right?

no the other way around, I should probably make the restoring force positive...

|dw:1353380229463:dw|

yeah the picture they used was probably a free falling mass

and saying that the sum of the force of gravity + any other force = F

Yeah that makes more sense. so they probably had up as positive and down as negative.

yep

so why is k(0.2) why 0.2? How did they come up with x=0.2?

never mind

LOL

that's the displacement haha

yes the displacement will still be posive

potential energy as positive...the restorative force?

Yes that makes sense

I had to reread the last sentence you wrote several times, but it makes sense now

but where did they get the 8 in sin and cos 8t

\(\large T=2\pi \sqrt{\frac{m}{k}}\)
T^-1 is the frequency of oscillation.

yep, sounds good. I googled it LOL \[T=2\pi \sqrt{\frac mk}\]

so the formula is \[x(t)=c_1cosTt+c_2sinTt\]

so T is \[\omega\]

\(\large . . . cos(\omega t) . . \)
No, ω is related to T.

Oh \[\omega=\sqrt{\frac km}\]

Right!

\[x(t)=c_1cos\omega t+c_2sin\omega t\]

leaning more towards engineering....physics formula sheet :P

omega doesn't seem to have units

omega should have units of s^-1, it's a frequency.

radians per second

according to my friend wiki

so s^-1 should be sufficient, i can leave the radians part out in my notation?

Oh I see

Thanks everyone!!!!