In this experiment the PASCO Force Table is used to demonstrate the addition of forces when an object is at so-called "static equilibrium" having zero acceleration and thus no net force acting on the object (In our case the object is the ring where all the strings are attached.). The forces are supplied by gravity acting on masses that hang down over pulleys. A ring at the center of the Force Table has strings attached to it that apply the forces to the ring. When the ring is centered over the middle of the Force Table, the angles of the applied forces can easily be determined by measuring the angles of the strings (using the angle markings on the Force Table). To check that equilibrium has actually been attained, pull the ring slightly to one side then release the ring and check to see that the ring returns to the center. If it does not, adjust the size of the hanging masses (remember the paper clips for fine adjustment) until the ring always returns to center after being moved in any direction. For valid results make sure that all of the strings lie along radial lines pointing out from the