Durinig the oscillation of the bob of a simple pendulum, what is the quantity that remains constant?

During the oscillations of the bob of a simple pendulum. What is the quantity that remains constant ?

the velocity of the bob of a simple pendulum is minimum at _____

What is meant by one oscillation of a simple pendulum ?

What is the period of oscillation of a simple pendulum if its bob is made of ice ?

The period of oscillation (T) of a simple pendulum depends on the probable quantities such as mass 'm' of a bob, length 'l' of the pendulum and acceleration due to gravity 'g' at the place. Derive an equation using dimensional analysis.

Which quantity is conserved during the oscillation of a simple pendulum ?