However, the number is usually just reported without units. The strength of this interaction can be calculated by the formula below: Newton’s Law is applied to urban geography in the sense that it determines the strength of the interaction between two urban geographical regions, which can be cities, metropolitan areas, countries, etc. To understand a gravity model definition, you should understand that it is called the gravity model because it is related to Isaac Newton’s Law of Gravitation, which predicts the gravitational force between two objects. The gravity model helps to give a clearer understanding of the distribution and size of cities while also providing useful explanations of interactions among networks among cities. When discussing urban geography, more particularly cities and urban land use, it is important to understand the gravity model, as we will discuss in this study guide.
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