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TABLE OF CONTENTSINTRODUCTION1Chapter I GeneralPrinciples2 I Systems ofForce4 IIStress6 III Properties ofMaterial7 IV Bolted and WeldedJoints10 V Beams -- A PracticalApplication13 VI BeamDesign17 VII Torsional Loading Shafts Couplings andKeys19 VIIIConclusion20BIBLIOGRAPHY21INTRODUCTION Mechanics is the physical science concerned with the dynamic behaviorof bodies that are acted on by mechanical disturbances Since such behavior is involved invirtually all the situations that confront an engineer mechanics lie at the core of muchengineering analysis In fact no physical science plays a greater role in engineeringthan does mechanics and it is the oldest of all physical sciences The writings ofArchimedes covering bouyancy and the lever were recorded before 200 BC Our modernknowledge of gravity and motion was established by Isaac Newton 1642-1727 Mechanics can be divided into two parts 1 Statics which relate tobodies at rest and 2 dynamics which deal with bodies in motion In this paper we willexplore the static dimension of mechanics and discuss the various types of force on anobject and the different strength of materials The term strength of materials refers to the ability of the individualparts of a machine or structure to resist loads It also permits the selection ofmaterials and the determination of dimensions to ensure the sufficient strength of thevarious partsGeneral Principles Before we can venture to explain statics one must have a firm grasp onclassical mechanics This is the study of Newtons laws and their extensionsNewtons three laws were originally stated as follows 1 Every body continues in its state of rest or of uniform motion in astraight line unless it is compelled to change that state byforces impressed on it 2 The change of motion is proportional to the motive force impressedand is made in the direction in which thatforce is impressed 3 To every action there is always opposed an equal reaction or themutual actions of two bodies on each otherare equal and direct to contrary parts Newtons law of gravitational attraction pertains to celestrialbodies or any
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