# lecture1 - College Physics Chapter 1 Introduction Theories...

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College Physics Chapter 1 troduction Introduction

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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 ystem works system works The theory makes predictions about how a system should work Experiments check the theories’ predictions Every theory is a work in progress
Structure of Matter - 1 Matter is made up of molecules olecules are made up of toms Molecules are made up of atoms Smallest identifiable structure of atter matter Correspond to elements O H H Water molecule: H 2 O Formed of 2 atoms of Hydrogen and 1 atom of Oxygen

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Structure of Matter Atoms are made up of ucleus Nucleus Protons, positively charged eutrons no charge Neutrons, no charge Both are made up of quarks Orbited by Electrons negatively charged Fundamental particle, no structure
Example of the development of a theory Electrons orbiting the nucleus do not have a “defined” position replaced by

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Prefixes Prefixes correspond to powers of 0 10 Each prefix has a specific name ach prefix has a specific Each prefix has a specific abbreviation
0.01 = 1X10 -2 00 = 1X10 2 100 = 1X10 Table 1.4, p. 3

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Fundamental Physical Quantities In mechanics there are three ndamental physical quantities fundamental physical quantities Length ass Mass Time ther physical quantities can be Other physical quantities can be constructed from these three
Units To communicate the result of a easurement for a physical measurement for a physical quantity, a unit must be defined efining units allows everyone to Defining units allows everyone to relate to the same fundamental mount amount

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Systems of Measurement Standardized systems greed upon by some authority
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lecture1 - College Physics Chapter 1 Introduction Theories...

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