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10k 5 k km h mh mh 5 3 physicalscience1 chapter2

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Unformatted text preview: ¾ ¾ ¾¾ + ¾5¾ /¾ = ® ® 15 km/h · When two vectors are parallel and opposite in direction, their resultant is their difference. Example: In the above problem, what is the boat’s speed if it is heading upstream? 10 k 5 k km h ¾ ¾ ¾ m/h ¾® + ¬¾m/h¾ = ¾5¾ /¾ ¾ ¾ ® 3 Physical Science 1 Chapter 2 HISTORY OF MOTION Study of motion goes back to the time of Aristotle (384­322 B.C.). In his view, two classes o f motion existed: natural and violent. In natural motion, every object had a proper place, determined by its “nature”. An object that was not in its proper place would “strive” to get there. Based on this view, Aristotle reasoned that an unsupported lump of clay, being of earth, would properly fall to the ground; and a puff o f smoke, being of the air, properly rose to the sky. According to Aristotle’s descript ion of motion, the distance of an object fro m its natural place was the determining factor in its motion. Violent motion resulted from pushing or pulling forces. Provided that a body was in its proper place, it would not move unless subjected to a force. Based on this view, the normal state of objects was rest. Galileo Galilei (1564­1642), the pioneer scient ist in mo ving phys ics into the modern era, broke rank with the traditional concepts of thinking. Galileo,...
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