TME = Total Mechanics Energy

SPE = Spring prenatal energy

KE = Kinetic Energy

SHM (Simple Harmonic Motion)

Simple: no energy lost TME = constant

Harmonic : Sinusoidal function with 1 frequency

TME = SPE + KE = Kemal (SPE = 0 (x = 0))

$SPE_{max} = \frac 1 2 kA^2$

constant energy

Wave ~= transfer energy of SHM

A good example of SHM is an object with mass m  attached to a spring on a frictionless surface,

We define periodic motion  to be any motion that repeats itself at regular time intervals, such as exhibited by the guitar string or by a child swinging on a swing. In this section, we study the basic characteristics of oscillations and their mathematical description.