chapter1 - College Physics Chapter 1 Introduction Theories...

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Unformatted text preview: College Physics Chapter 1 Introduction Theories and Experiments The goal of physics is to develop theories based on experiments A physical 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 Units To communicate the result of a measurement for a quantity, a unit must be defined Defining aunits allows everyone to relate to the same fundamental amount Systems of Measurement Standardized systems Agreed upon by some authority, usually a governmental body SI Systme International Agreed to in 1960 by an international committee Main system used in this text Length Units SI meter, m Defined in terms of a meter the distance traveled by light in a vacuum during a given time Also establishes the value for the speed of light in a vacuum Mass Units SI kilogram, kg Defined in terms of kilogram, based on a specific cylinder kept at the International Bureau of Weights and Measures Standard Kilogram Time Units seconds, s Defined in terms of the oscillation of radiation from a cesium atom Approximate Values Various tables in the text show approximate values for length, mass, and time Note the wide range of values Lengths Table 1.1 Masses Table 1.2 Time intervals Table 1.3 Other Systems of Measurements 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 Prefixes...
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chapter1 - College Physics Chapter 1 Introduction Theories...

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