Centripetal Force Kit (LSE) This PSSC-designed kit can be used to show the effect of mass, radius and velocity on the centripetal force of a rotating body. The experiment uses the weight of one to 20 1g masses from one end of a cord as a counterweight to the pull of a rubber weight swinging in a circle overhead. Includes handle, sturdy cord, rubber weight, masses (20) and instructions. Qty :