Pendulum:

Draw a free body diagram for the pendulum at an angle $,$ and write an expression for the restoring force as a function of $.$

Describe in detail how the principle of energy conservation applies to the pendulum's oscillations.

Both:

$7.$ Explain each of the following concepts: a$)$ restoring force

b$)$ linear relationship

$8.$ Show that Eq$.1$ and Eq$.2$ are dimensionally reasonable.