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Lecture2

# Lecture2 - Lecture 2 Chapter 1a Math Intro Units Sig Figs...

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Lecture 2 Chapter 1a Math Intro: Units, Sig Figs, Vectors, Estimations

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Announcements There will be problem session tomorrow at 7pm center hall 216 Quiz Info: You have 1 week after quiz results are posted to dispute your grade.
Standards of Quantities Last time we discussed the vastness of the study of physics. (Subatomic to Galactic) Need standard of units to measure and quantify things. Three basic quantities: Time, Length and Mass Everything we deal with in this class (next quarter you will add more fundamental quantities) can be broken up into these three things. Example: Velocity, Acceleration, Force

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SI – Systéme International Main system used in this text Length SI – meter, m Time Seconds, s Mass SI – kilogram, kg Other unit systems? English => [feet, slugs, seconds] Gaussian => [centimeter, grams, seconds]
Prefixes The prefixes can be used with any base units They are multipliers of the base unit Examples: 1 mm = 10 -3 m 1 mg = 10 -3 g

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Fundamental and Derived Quantities In mechanics, three fundamental quantities are used Length Mass Time Will also use derived quantities These are other quantities that can be expressed as a mathematical combination of fundamental quantities Density is an example of a derived quantity It is defined as mass per unit volume Units are kg/m 3 V m = ρ
Unit Conversions Sometimes you need to change your units You can use conversion factors with unit value Example, change 1.5 g/cm 3 to kg/m 3 1.5 1,500 kg/m 3

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Unit Conversions How important are unit conversions? In 1999, \$125 millon Mars Climate Orbiter was approaching Mars. Contact was lost as it reached Mars. The Orbiter passed 57 km above the Mars surface, instead of the intended 147 km.
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