![]() Plato described weight as the natural tendency of objects to seek their kin. These were typically viewed as inherent properties of objects. Weighing grain, from the Babur-namah ĭiscussion of the concepts of heaviness (weight) and lightness (levity) date back to the ancient Greek philosophers. History Ancient Greek official bronze weights dating from around the 6th century BC, exhibited in the Ancient Agora Museum in Athens, housed in the Stoa of Attalus. The current situation is that a multiple set of concepts co-exist and find use in their various contexts. In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. įurther complications in elucidating the various concepts of weight have to do with the theory of relativity according to which gravity is modeled as a consequence of the curvature of spacetime. comparing and converting force weight in pounds to mass in kilograms and vice versa). ![]() Although weight and mass are scientifically distinct quantities, the terms are often confused with each other in everyday use (e.g. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon. The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. In this sense of weight, terrestrial objects can be weightless: ignoring air resistance, the famous apple falling from the tree, on its way to meet the ground near Isaac Newton, would be weightless. Thus, in a state of free fall, the weight would be zero. Yet others define it as the magnitude of the reaction force exerted on a body by mechanisms that counteract the effects of gravity: the weight is the quantity that is measured by, for example, a spring scale. Others define weight as a scalar quantity, the magnitude of the gravitational force. Some standard textbooks define weight as a vector quantity, the gravitational force acting on the object. In science and engineering, the weight of an object is the force acting on the object due to acceleration or gravity. ![]()
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