EJSS Horizontal Spring Mass Model
http://weelookang.blogspot.sg/2015/01/shm-chapter-04.html

Run Model

https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_SHMxva/SHMxva_Simulation.html

Q1: Consider an object P oscillating between point A and B about the origin (0,0), assuming the usual Cartesian Coordinate System apply.  Observe the Model and suggests possible meaning of the following points with the most suitable descriptions.
central equilibrium position
instantaneous position
maximum amplitude  m
minimum amplitude  m
Given the equation x = x0 sin ( ? t ) can describe SHM, suggests the usual symbols associated to the physical quantity
central equilibrium position
instantaneous position or displacement given by vector OP    m
maximum amplitude    m
minimum amplitude    m
time taken for one complete oscillation, for example Path from O?A?O?B?O    s
number of oscillations performed per unit time  1/s. Hence, f and T are related by the equation  f = 1 T
angular frequency  rad/s. Since one complete oscillation is 2? radians, ? and f are related by ? = 2? f