Term Paper: Newton's Three Laws of Motion

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Newton's Three Laws Of Motion

Three laws of motion, published in 1687 by Sir Isaac Newton in his work Philosophiae Naturalis Principia Mathematica, formed the basis of modern classical mechanics and dynamics. These laws were initially explained on the example of simple physical objects, but their application expands over objects of different nature and in general, classical physics of universe is based on them. Newton's three laws of motion supplemented knowledge of physics and mechanics and gave a deeper explanation of law of universal gravitation and Kepler's laws of planetary motion. Systematization of dynamics and motion knowledge, which is provided by these laws on the hand with mathematical apparatus of calculus, gave an impulse to the development of different branches of physics: mechanics and its brunches, electromagnetism, optics, molecular physics.

Three Newton laws are postulated as follows:

First Law: Objects in motion tend to stay in motion, and objects at rest tend to stay at rest unless an outside force acts upon them.

Second law: The rate of change of the momentum of a body is directly proportional to the net force acting on it, and the direction of the change in momentum takes place in the direction of the net force.

Third law: To every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction).

The first law is also called law of inertia or principle of Galileo, saying that uniform motion is motion with constant velocity (constant speed in linear path). Constant velocity also implies that the object moves without acceleration and that the net force (or vector sum of forces which act on the object) equals to zero. The first law of motion states that a resting object will move only when forces acts upon it and moving object will not experience change in velocity until it experiences force upon it. The first law seems to be very easy for understanding and quite obvious, but at the same time it's impossible to prove it directly under usual conditions. There are not objects, which will be moving with constant velocity forever, and there are no objects, which are at rest forever: friction forces, microscopic dynamics and other factors contribute to interruption of inertia. It's a well-known fact that a launched ball or hockey puck will… [END OF PREVIEW]

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