Hi. My Physics teacher never explains anything, and there's something I'm very confused about. I need to know before school starts again, so I'm asking here.
***I'm using w for the small letter omega.***
At a random position in SHM, displacement is given as
x=Acos(wt), where A is the amplitude.
To find the equation for velocity at that point, you just derive it. The derivation of cos(x) is -sin(x). All is fine so far.
What I'm confused about is why the equation is x= -wAsin(wt), and not just
x= -Asin(wt). Where does the extra omega come from??
I've noticed that when you derive it again, you get w^2, so clearly it is multiplied by w each time, but I can't work out why.
I've asked a few people and nobody could explain it to me. No one is my class seems to have any idea either.
Any and all help is greatly appreciated. Thanks!