ch01 - Chapter1 GeneralPrinciples...

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Engineering Mechanics: Statics Chapter 1 General Principles
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Chapter Objectives To provide an introduction to the basic quantities and  idealizations of mechanics. To give a statement of Newton’s Laws of Motion and  Gravitation. To review the principles for applying the SI system of  units. To examine the standard procedures for performing  numerical calculations. To present a general guide for solving problems.
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Chapter Outline Mechanics Fundamental Concepts Units of Measurement The International System of Units Numerical Calculations General Procedure for Analysis
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1.1 Mechanics Mechanics can be divided into 3  branches: - Rigid-body Mechanics - Deformable-body Mechanics - Fluid Mechanics Rigid-body Mechanics  deals with  Statics  - Dynamics
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1.1 Mechanics Statics  – Equilibrium of bodies At rest Move with constant velocity Dynamics  – Accelerated motion of  bodies
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1.2 Fundamentals Concepts  Basic Quantities Length  – Locate position and describe size of physical  system – Define distance and geometric properties of a  body Mass  – Comparison of action of one body against  another – Measure of resistance of matter to a change in  velocity
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1.2 Fundamentals Concepts  Basic Quantities Time  – Conceive as succession of events Force – “push” or “pull” exerted by one body on another – Occur due to direct contact between bodies  Eg: Person pushing against the wall – Occur through a distance without direct contact  Eg: Gravitational, electrical and magnetic forces
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1.2 Fundamentals Concepts Idealizations Particles  – Consider mass but neglect size Eg: Size of Earth insignificant compared to its  size of orbit Rigid Body – Combination of large number of particles  – Neglect material properties Eg: Deformations in structures, machines and  mechanism  
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1.2 Fundamentals Concepts Idealizations Concentrated Force  – Effect of loading, assumed to act at a point  on a body  – Represented by a concentrated force,  provided loading area is small compared to  overall size Eg: Contact force between wheel and ground 
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1.2 Fundamentals Concepts Newton’s Three Laws of Motion First Law “A particle originally at rest, or moving in a  straight line with constant velocity, will remain  in this state provided that the particle is not  subjected to an unbalanced  force”  
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1.2 Fundamentals Concepts Newton’s Three Laws of Motion Second Law “A particle acted upon by an  unbalanced  force   F  experiences an acceleration  a  that  has the same direction as the force and a  magnitude that is directly proportional to the  force”  ma F =
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1.2 Fundamentals Concepts
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ch01 - Chapter1 GeneralPrinciples...

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