This hands-on project asked students to construct a mobile using materials available in the classroom, wooden dowels, and string. Through this assignment, students’ mobiles provided a personally meaningful context for applying their understanding of torque and static equilibrium. As a summative assessment, students were expected to document their work as they progressed through the assignment: they took photos of their mobiles, diagrammed their mobiles with accurate length and mass measurements, and then used net torque equations to verify the condition for static equilibrium for each wooden dowel. Students were given an example solution as a reference for the minimum quality of work that was expected to meet the minimum achievement. By requiring students to analyze a structure they built, students became their own evaluators and could confirm their ability to master the content standards. Any small gaps in their understanding of torque were addressed during the assessment, and the assessment provided additional support for torque when we moved on to rotational dynamics.