posted by charlie .
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
1. What does the sine wave represent?
2. Yes. If your sine wave is amplitude.
3. This makes no sense.
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).