chapter1_151

# chapter1_151 - CollegePhysics Chapter1 Introduction...

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College Physics Chapter 1 Introduction

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Theories and Experiments The goal of physics is to develop theories  based on experiments A theory is a “guess,” expressed  mathematically, about how a system works The theory makes predictions about how a  system should work Experiments check the theories’ predictions Every theory is a work in progress
Fundamental Quantities and  Their Dimension Length [L] Mass [M] Time [T] other physical quantities can be  constructed from these three

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Units To communicate the result of a  measurement for a quantity, a  unit  must  be defined Defining units allows everyone to relate  to the same fundamental amount
Systems of Measurement Standardized systems agreed upon by some authority, usually a  governmental body SI -- Systéme International agreed to in 1960 by an international committee main system used in this text also called mks for the first letters in the units of  the fundamental quantities

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Systems of Measurements,  cont cgs – Gaussian system named for the first letters of the units it  uses for fundamental quantities US Customary everyday units often uses weight, in pounds, instead of  mass as a fundamental quantity
Length Units SI – meter, m cgs – centimeter, cm

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chapter1_151 - CollegePhysics Chapter1 Introduction...

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