Define centre of gravity
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Center of the gravity is the point at which the whole weight of a body may be considered to act, if the body is situated in a uniform gravitational field.
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Centre of gravity, in physics, an imaginary point in a body of matter where, for convenience in certain calculations, the total weight of the body may be thought to be concentrated. The concept is sometimes useful in designing static structures (e.g., buildings and bridges) or in predicting the behaviour of a moving body when it is acted on by gravity.
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