PHY 101 1nd Edition Lecture 1 Chapter 1 Introduction Outline II Fundamentals III SI Units IV History of Length Mass and Time V Unit Conversion Current Lecture Fundamental Quantities and Units o Mechanics 3 quantities 1 Length L 2 Mass M 3 Time T o Can derive all other quantities from these o Ex V L L L volume Defined by SI units System International USE THESE ONLY o Length meter m o Mass kilogram kg o Time seconds s length o redefined 3 times most modern definition found in 1983 o modern definition distance traveled by light in 1 299792458 s mass o defined by mass of platinum iridium alloy time o before 1960 defined as 1 86400 of the average solar day o modern definition the frequency of radiation from the cesium atom Unit Conversion o Ex feet meters o Conversion 1 m 3 281 ft 1 mile 1609 m 1 609 km Ex 1 ft 1 3 281 m 0 305 m since 1 m 3 281 ft These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Therefore 5 0ft 6 0m 5 0 x 0 305 6 0 1 52 6 0 7 52
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