Every day we unconsciously balance objects and rarely think about the conditions that must be fulfilled in order to achieve this said balance. For a physical object balancing it would mean the average position in which the force of gravity of the object is directed. This point is termed as the centre of gravity. Sometimes the centre of gravity is the objects geometric centre, for example, a ruler but this need not be always true. If we are to take the example of a ruler, as one slides his finger slowly from one end of the ruler to the other. Around half way of the ruler, one can balance it. If we were to add an extra weight such as and eraser to one end of the ruler the weight and centre of gravity would shift closer to this new heavy object. This is the founding principle behind balancing an object.
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