Book excerpt: In this Forces and Motion module, students learn how to plan and conduct well-designed experiments through a study of periodic motion, gravitational attraction, kinetic and potential energy, and pendulum systems.Students conduct experiments on a pendulum based upon three independent variables.Their task is to write an engineering report and construct a model of a pendulum ride for an amusement park. As an extension, they design and conduct investigations on pendulums on the moon and compare the results to the behaviour of pendulums on Earth.