Students in Liz Kim's 6th grade science class are exploring the practices of scientists and engineers by creating and flying rubber band-powered trolleys along fishing lines to think critically about motion. Acting as scientists, they designed controlled experiments to test an independent variable of their choice that affects an air-trolley system. Then, stepping into the roles of engineers, they found ways to modify the system to meet self-imposed criteria and constraints. This project is part of a larger STEM unit in which students explore how understanding variables help scientists make sense of phenomena and help engineers design solutions to those problems.

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