Lec-1 summer 2018.pdf - ON-Line Lecture 1 Topic-1...

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ON-Line Lecture # 1 Topic-1 Sections (1.3 , 1.5, 1.7 & 1.8) Dimensional analysis, Units, Coordinates & Trigonometry Practice these solved examples in your text book: Example: 1.1, 1.2, 1.9, 1.10
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1.3- Dimensional Analysis Mechanics uses three fundamental quantities Length [L] Mass [M] Time [T] Using defining equations; other physical quantities can be constructed from these three fundamental quantities. Dimensions of some common quantities are listed in Table 1.5
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Dimensions (length, mass, time, combinations) can be treated as algebraic quantities Add, subtract, multiply, divide. Dimensional analysis may be used to check the correctness of an equation. Both sides of equation must have the same dimensions. If the two sides of an equation have the same dimensions means that the equation is dimensionally correct. Dimensional analysis tells us if an equation is incorrect or not but does not confirm that it is correct.
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Examples on Dimensional Analysis
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Ex- 4 Suppose that two quantities, A and B, have different dimensions.
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