# C7 - 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/ PPH 0075 Physics 1 Foundation in Engineering ONLINE NOTES Chapter 7 Mechanics of Matter Applied Science Department (ASD) Centre for Foundation Studies and Extension Education (FOSEE)

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PPH0075 Physics 1 Chapter 7 ASD 2008/09 1/7 CHAPTER 7 MECHANICS OF MATTER States of Matter/phases Three common states : 1. Solid – maintains a fixed shape and a fixed size when a large force is applied 2. Liquid – not maintain a fixed shape but maintain its volume 3. Gas – neither maintain a fixed shape nor its volume ELASTICITY ; STRESS AND STRAIN If a force is exerted on an object, such as the vertically suspended metal rod shown in Figure 7.1, the length of of the object changes. If the amount of elongation, Δ L, is small compared to the length of the object, experiment shows that Δ L is proportional to the weight or force exerted on the object. Or can be written F = k Δ L ,-------------(1) where k is the proportional constant. This is called Hooke’s law. For the force too great the object stretches excessively and eventually breaks. Figure 7.1
PPH0075 Physics 1 Chapter 7 ASD 2008/09 2/7 Figure 7.2 shows a typical graph of applied force, F versus elongation, Δ L From O to A the graph is straight line : elongation is directly proportional to applied force. Hooke's law is obeyed. Point A is the limit of proportionality.

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## C7 - Applied Science Department (ASD) Centre for Foundation...

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