(Originais Teachy 2023) - Question Medium of Physics

A young girl observes the swing of a simple pendulum in the leisure square of her school. She notices that the pendulum's movement is repetitive and follows similar patterns. Based on this observation, she wants to understand if the pendulum's movement is an example of Simple Harmonic Motion (SHM). (a) Define Simple Harmonic Motion, describing its main characteristics. (b) Considering the definition of SHM, explain if the pendulum's movement fits into this category or not. (c) If the answer is affirmative, explain what condition must be met for a simple pendulum to perform SHM. If the answer is negative, indicate the necessary conditions for a movement to be considered simple harmonic.