# 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 – Systéme 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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