Balance. This game is based on the moments concept. A moment is a quantity representing the magnitude of a force influencing the rotation of an object.The rotation depends on the magnitude of the force and the perpendicular distance of the force from the pivot. The object is represented in the game as a bar lying on a wheel that acts as the pivot for the system. At the sides of the bar there are two boxes representing two forces acting on the beam. The user can control the movement of the bar and change the force acting on one side of the beamby catching balls of different weights. The objective at each level is to balance the moments acting on the beam.Increases in concept-dependant difficulty levels are achieved by moving the pivot closer to one of the ends of the bar or by adding one or more boxes to the beam.Figure 5 shows a snapshot of the game being played by a student.
