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 This  small group-  activity is designed to help upper division undergraduate students to recall the equation of motion and solving the simple harmonic equation. 
 
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 Students asked to find and to solve the equation of motion of a single pendulum
 
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 The wrap-up discussion focused on giving students perspective that single pendulum is the foundation to understand a periodic system.
 
Students are familiar with the equation of motion of the pendulum. They have been learning about this from their intro classes, Oscillations, and 1 Dimensional Waves. This activity would help the students remember what they have learned and to get the students thinking about how to apply a simple idea to a more complicated system.