From Aristotle to Newton: The Development of Modern Physics

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In the fourth century, Aristotle developed the first systematic set of ideas to describe the natural world, often referred to as Aristotelian physics. In his research, Aristotle made many discoveries dealing with the dynamics of motion. He believed that the natural motion of an object was primarily determined by the nature of the substance that made up the object, in terms of the four basic elements: earth, air, fire and water. Therefore, a stone, when released from the hand, fell to the ground because it was made of similar substance as the Earth. In a like manner, smoke rose into the sky because it wanted to be closer to the air and farther away from the Earth. In observing this, Aristotle concluded that natural motion came from the tendency of objects to return to their “natural” place and come to rest. He decided that objects intrinsically have either the natural tendency to fall to the earth, which he termed gravity, or the tendency to rise into the sky, which he called levity. Aristotle also believed that heavier objects fell faster than smaller objects because falling speed is proportional to the weight of the object. The bigger the mass, the more intrinsic natural tendency the object contained that would draw it back to the surface of the Earth. This accounted for the motion of inanimate matter, attributing the movement to the “nature” of something that was obviously not alive. Aristotle distinguished between natural motion and forced or “violent” motion of non-living objects. Forced motion occurred when a mass was acted upon by some other object that made it move. For example, the natural tendency for a stone, when left unsupported, is to fall to the Earth, but it can also be lifted or thrown. Aristotle called this ... ... middle of paper ... ...d balance out, resulting in a stagnant system. An example of Newton’s third law is the tension in a rope that is tied to a large mass. When the rope is pulled, a force is exerted on the mass by the person pulling, and an equal and opposite force is applied on the person by the mass, which causes the whole system to stand still. Motion, then resulted from an imbalance of the net force, as seen in Newton’s second law of motion. Sir Isaac Newton was able to draw on the misconceptions of Aristotle and the observations of Galileo to generalize the three laws of universal motion. These laws changed how the Universe was viewed, and clearly showed the modern explanation of forces through his statements. Newton united the research of many prominent scientists, including Aristotle and Galileo, to complete the mechanical theories now called Classical or Newtonian mechanics.

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