Posted by charlie on Wednesday, November 5, 2008 at 1:51pm.
Am self studying SHM, so sorry for the elementary questions.
Would someone check/confirm some facts i think I've learned please.
1 If a sine wave graph starts at the origin at time = 0s, the sysyem is in equilibrium?
2 The amplitude at t= 0s is zero.
3 Same system, the phase angle/constant (phi) is 0 or pi?
4 When a system is displaced, but at rest, the phase angle is + or  half pi?
Confirmation or advice appreciated
Thanks

Physics SHM  bobpursley, Wednesday, November 5, 2008 at 3:41pm
1. What does the sine wave represent?
2. Yes. If your sine wave is amplitude.
3. This makes no sense.
4. yes.

Physics SHM  charlie, Thursday, November 6, 2008 at 4:24am
Sorry Bob,
The wave represents a simple pendulum.
In 3, I'm referring to the equation
x(t)=Asin(wt+(greek letter phi)), so was looking to confirm that in that specific circumstance I outlined, the value of phi would either be zero or pi (as in 22/7).
Thanks.
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