When the objects on the earth's surface, mass (Mass) of an object is gravity action all the time. Gravity towards the mass of the object is called a weight (Weight) of the object. By that point as the position that the weight of all of the objects.The center of gravity (Center of Gravity:CG) if the center of gravity and vertical through the center of gravity, which is perpendicular to the ground in the base of the object. Objects can be stable without falling
."The little girl gymnast." A toy show the balance of the doll on a narrow area. By using the principle of the relationship between the position of center of gravity and balance of the objects.Tilt to the left or right in moderation. The doll is still sliding back stand without falling from the wire. Because the center of gravity of the doll is low. Line of center of gravity, and on the base of dolls are in equilibrium.0 and moment of force or the size of the torque output of 0 at the balance point. A moment is clockwise moment moment results (= counterclockwise)
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