During oscillatory motion, the acceleration is not constant. The general kinematics relationships are nevertheless valid (remember back from week 2 the following image).
Oscillatory motion is the primary example that we will study in this class of a non-constant acceleration motion.
We will limit our analysis to simple harmonic motion where the motion is sinusoidal.
The first question below is particularly important since this is a common misunderstanding regarding the definition of a "full cycle".
Rad for radian is not a real unit and it is sometimes omitted. It is there to remind us that when you multiply the angular frequency by a time, you get an angle and that angle is in radians, not degrees. Be careful to use rad on your calculator when relevant in your calculations.
One of the most important properties of harmonic oscillator is that the amplitude and the period (or frequency) are independent. You can change the amplitude as much as you want and the period stays the same.
We illustrates this fact in the following video using a pendulum.