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ADDIS ABABA UNIVERSITY

Faculty of Technology

Department of

Civil EngineeringEngineering Mechanics

material by Karsten Schlesier

Engineering Mechanics I

(ceng 1001) Semester I 2008 / 2009

Introduction


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Department of



Definition

Mechanics …


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Department of



Definition

Mechanics is a science that describes

and predicts the conditions of rest ormotion under the action of forces.


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Department of



Mechanics


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Department of



Mechanics

Statics

Rigid bodies at rest,

Equilibrium of rigid bodies

(under the action of forces)


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Department of



Mechanics

Statics Dynamics




Motion of rigid bodies

(by action of unbalanced forces)


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Department of



Mechanics

Statics Dynamics

Kinematics Kinetics






Geometry of motion Motion in relation

to forces


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Department of



Mechanics

Statics Dynamics

Kinematics Kinetics







to forces


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Department of



Mechanics

Statics Dynamics

Kinematics Kinetics







to forces


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Department of



Rigid body?


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Department of



Rigid body?


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Department of



Force


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Department of



magnitude

Force


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Department of



Force and Equilibrium


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Department of



Rigid body


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Department of



Rigid body

At rest?


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Department of




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Department of




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Department of



Weight Action


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Department of



Weight

Support

Action

Reaction


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Department of



Weight

Support

Action

Reaction

=

Equilibrium!


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Department of




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Department of




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Department of




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Department of



Weight = Force


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Department of



Action


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Department of



Action

Support


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Department of



Action

Reaction


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Department of



Action

Reaction

Equilibrium!


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Department of




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Department of




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Department of




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Department of




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Department of




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Department of



Action

Reaction


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Department of



Action

Reaction


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Department of



Action

Reaction

Friction

Decomposition


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Department of



Action

Reaction

Decomposition

of Forces


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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of



weight


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Department of



weight


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Department of




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Department of




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Department of



Single Force Members


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Department of




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Department of




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Department of




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Department of




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Department of




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Department of



Reaction?


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Department of




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Department of



Reaction?


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Department of




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Department of



tension


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Department of



tension


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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of




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Department of Civil Engineering

Engineering Mechanicsmaterial by Karsten Schlesier


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ADDIS ABABA UNIVERSITYFaculty of Technology




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hanging model – tensile forces only


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arch – compressive forces only


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weight

weight

arch – compressive forces only


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Two Force Systems


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Two Force Systems


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compression


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compression


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tension


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tension


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Department of Civil EngineeringEngineering Mechanicsmaterial by Karsten Schlesier


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tension


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tension


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ADDIS ABABA UNIVERSITYFaculty of Technology Department of Civil EngineeringEngineering Mechanicsmaterial by Karsten Schlesier

tension


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compression


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tension


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compression


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Department of

Civil EngineeringEngineering Mechanicsmaterial by Karsten Schlesier


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Department of

Civil EngineeringEngineering Mechanicsmaterial by Karsten Schlesier

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