The student clearly states the independent variable, the coefficient of friction, and the dependent variable, the acceleration of the plastic ball, in the research question. While the student provides relevant background theory and explains the choice of measurement techniques effectively, there is a lack of detail regarding the method of analysis and the justification for the number of trials conducted. Additionally, the student does not adequately name or explain how controlled variables were managed. However, the student addresses safety, ethical, and environmental issues well, demonstrating a comprehensive understanding of the broader implications of the investigation.
