Students balance multiple forces on the disc, graph these forces as vectors, and calculate the magnitude and direction of force each weight exerts. A terrific way to introduce scalars, vectors, and vector analysis. Table includes a 40-cm protractor disc with dual graduated markings (one in 1° increments, the other in 2° increments) for ease and accuracy, 3 legs with adjustable feet (built-in leveling screws) for leveling the disc, center ring and post, thread, 4 weight hangers, and instructions. The top is made from durable PVC and laminated, allowing students to use erasable markers.