The student's choice of investigating the effect of string length on the period of a bifilar pendulum was justified through personal significance and interest, as they expressed a desire to study mechanical engineering at university and noted the connection to topics learned in class. Additionally, they mentioned being inspired by a video they have recently seen. Furthermore, the student demonstrated personal input and initiative in the investigation through a detailed literature review, experiment design, data collection, and analysis. Their decision to use a digital video recorder instead of a stopwatch and the thorough analysis of uncertainties showcased personal initiative in the design and implementation of the investigation. The student also formulated a hypothesis and shared their predictions, indicating evidence of individual input and initiative.
