Measure vector forces and angles with this accurate device. Arrange each pulley around the table's edge and adjust the weight on each cord to center the ring and balance the forces. When the forces are balanced, the system is in static equilibrium. Features adjustable feet, low-friction pulleys, and exact 1° graduations around the edge to deliver maximum precision. Unit includes a 35-cm-diam force table, 3 pulleys, 3 weight hangers, 3 weight sets (10, 20, 50, and 100 g in each set), and instructions.