Ac 2007-1174: a Versatile and Economical Apparatus for Experiments in Statics

A student’s understanding of engineering concepts can be furthered through the use of hands-on experiments and demonstrations. For many students, the concepts of vectors, particle equilibrium, and rigid body equilibrium can be difficult to comprehend. In order to improve comprehension in these areas, we developed a single apparatus that provides for the operation of at least five experiments relevant to the study of statics. These experiments are well-suited for either laboratory studies or, due to the device’s portability, for in-class demonstrations. In this paper we present the complete design, including the bill of materials, assembly drawings, and assembly instructions for the apparatus. The apparatus is easily assembled from readily available parts and materials, especially sturdy, easily expandable, and very affordable (approximate cost of materials is $500). In addition, we present the details of five experiments that can be performed utilizing the device. For each experiment, we provide the objective, procedure, and recommended data analysis. The five experiments are: 1) Particle Equilibrium: Tension Components in Cables of Independent Lengths; 2) Particle Equilibrium: Tension Components in Cables of Equal Lengths; 3) Particle Equilibrium: Equilibrium Position of a Pulley System; 4) Rigid Body Equilibrium: Tension in a Cable; and 5) Friction: Friction Force as a Function of Contact Angle. Each experiment can be compared to a theoretical analysis with good agreement, providing the student with a handson experience to advance the student’s understanding of these concepts.