Specific gravity definition pdf forward this error screen to sharedip-1601531662. This page is about the physical concept.
For example, an object with a mass of one kilogram has a weight of about 9. There the weight is a measure of the magnitude of the reaction force exerted on a body. Typically, in measuring an object’s weight, the object is placed on scales at rest with respect to the earth, but the definition can be extended to other states of motion. Thus, in a state of free fall, the weight would be zero. In this second sense of weight, terrestrial objects can be weightless.
In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. The current situation is that a multiple set of concepts co-exist and find use in their various contexts. These were typically viewed as inherent properties of objects. He ascribed absolute weight to earth and absolute levity to fire.
According to Aristotle, weight was the direct cause of the falling motion of an object, the speed of the falling object was supposed to be directly proportionate to the weight of the object. As medieval scholars discovered that in practice the speed of a falling object increased with time, this prompted a change to the concept of weight to maintain this cause effect relationship. Platonic idea that like objects attract but in the context of heavenly bodies. He proposed a way to measure the difference between the weight of a moving object and an object at rest.
Ultimately, he concluded weight was proportionate to the amount of matter of an object, and not the speed of motion as supposed by the Aristotelean view of physics. In particular, Newton considered weight to be relative to another object causing the gravitational pull, e. Newton considered time and space to be absolute. This allowed him to consider concepts as true position and true velocity. Newton also recognized that weight as measured by the action of weighing was affected by environmental factors such as buoyancy.