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# C4 - Applied Science Department(ASD Centre for Foundation...

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FOSEE , MULTIMEDIA UNIVERSITY (436821-T) MELAKA CAMPUS, JALAN AYER KEROH LAMA, 75450 MELAKA, MALAYSIA. Tel 606 252 3594 Fax 606 231 8799 URL: http://fosee.mmu.edu.my/~asd/ PPH0075 Physics 1 Foundation in Engineering ONLINE NOTES Lecture Notes Chapter 4: Static Equilibrium Applied Science Department (ASD) Centre for Foundation Studies and Extension Education (FOSEE)

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PPH0075 Physics 1 Chapter 4 ______________________________________________________________________________________ ASD2008/09 1/ 8 Static Equilibrium 4.2 The conditions of equilibrium 1 st condition 2 nd condition ° F = 0, ° τ = 0 ° F x = 0 and about any axis ° F y = 0 τ -the tendency to rotate about an axis ) ( ) ( Nm F l Nm F r ° ° ° × = × = τ τ 4.1 The Equilibrium of forces Static Translational Equilibrium Equilibrium -object at rest - object moves with constant v 4.3 The center of mass and the center of gravity ° Center of mass- the point that moves in the same path when the body rotates X cm = N N N m m m x m x m x m + + + + + + ........ ......... 2 1 2 2 1 1 Y cm = N N N m m m y m y m y m + + + + + + ........ ......... 2 1 2 2 1 1 ° Center of gravity- the geometric point, determined by experiment method 4.4 Moment of inertia ° Moment of inertia - resistance of an object to change its rotational motion about an axis ° Moment of inertia , I = m 1 r 1 2 + m 2 r 2 2 + m 3 r 3 2 +……….+ m n r n 2 = ° n i i r m 1 2
PPH0075 Physics 1 Chapter 4 ______________________________________________________________________________________ ASD2008/09 2/ 8 CHAPTER 4 : STATIC EQUILIBRIUM CONTENTS 4.1 The Equilibrium of forces 4.2 The conditions of equilibrium 4.3 The center of mass and center of gravity 4.4 Moment of Inertia , I 4.1 The Equilibrium of forces The term equilibrium implies either that the object is at rest (called static equilibrium) or that is center of mass moves with constant velocity (called translational equilibrium). We deal here only with the former, which are referred to as objects in static equilibrium.

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C4 - Applied Science Department(ASD Centre for Foundation...

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