Centre Of Gravity. As the reaction of every body to every force is directed from the centre of the masses, so bodies subject to centripetal force re-act from their centres, and, if these are not supported, the body yields or falls. Hence, as in the engraving, when the centre of the mass is within the perpendicular of the wheels, it does not yield; but if so inclined as that the perpendicular from the centre falls beyond the wheels, then the centre falls, and the carriage is overset. In cases of danger, therefore, as in a boat or carriage, the object should be to lower the centre of the mass by lying down.

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