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Lecture_2 - PHYS 218 General Physics Fall 2012 Prof.Kol4ck...

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Fall 2012 PHYS 218: General Physics Lecture 2: Chapter 2.1, 2.2, 2.3 Mo4on, Forces and Newton’s Laws Prof. Kol4ck Physics Rm. 114 MW 9:30‐10:20
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Aristotle s Mechanics – Motions Types of motion identified by Aristotle – Celestial motion The motion of things like the planets, the Moon, and the stars – Terrestrial motion The motion of “everyday” objects Motions of celestial objects and terrestrial objects look very different – Mainly because terrestrial objects seem to come to a stop and celestial objects do not The natural state of terrestrial objects was at rest Sec4on 2.1
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More About Aristotle s Terrestrial Motion Motion is caused by forces Terrestrial objects move only when acted upon by another object In modern terminology, this would say that an object moves only when acted on by a force Forces are produced by contact with other objects Sec4on 2.1
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More About Forces A force is a push or a pull on an object Force is a vector quantity – The magnitude of the force is the strength of the push or pull – The direction of the force is the direction of the push or pull – Denoted by F _ Sec4on 2.1
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Motion
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