PHYSICS - Jona Mata & Jennifer Kim Physics 3rd October 17,...

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Physics 3 rd October 17, 2010 Inertia, Momentum and Seatbelts The principles of Inertia and Momentum are essential aspects and developments of the study of Physics. While Inertia and Momentum are antithesis of each other, the principles are alike in the degree of importance to which the latter have achieved in developing the scientific branch of Physics for the past ages. Inertia and Momentum have become the focal points for Newton’s First and Second Laws and also have been used for major branches of Physics, such as Quantum Mechanics. With these essential aspects, Inertia and Momentum have become important principles that have shaped Physics in its present form today. Inertia, by defintion, is the resistance an object has to a change in its state of motion (MansfieldConnecticut). The history of Inertia arises from the work of Galileo Galilei in the seventeenth century. Galileo conducted an experiment wherein he recorded the time of descent of bronze balls of various sizes which rolled down an inclined plane. With the results stating that the size did not matter and that the speed of descent remained constant, Galileo concluded that freely falling objects experience uniform acceleration regardless of mass, as long as extraneous forces, such as air resistance and friction, can be minimized (HowStuffWorks). French Philosopher, René Descartes, then added to Galileo’s findings by summarizing in three laws the Cartesian Conservation Principle. The principle states that each thing, as far as is in its power, always remains in the same state; and that consequently, when it is once moved, it always continues to move (Descartes 37). With these prior developments in the study of Inertia, English physicist Sir Isaac Newton developed his first law of motion. The first law of motion states that every body remains in a state of rest or uniform unless it is acted upon by an external unbalanced force. This means that in the absence of a non-zero net force, the center of mass of a body either remains at rest, or moves at a
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This note was uploaded on 12/01/2010 for the course BIOS 140 taught by Professor Webster during the Spring '08 term at DeVry Austin.

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PHYSICS - Jona Mata & Jennifer Kim Physics 3rd October 17,...

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