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Copyright © 2012 Pearson Education Inc. PowerPoint ® Lectures for University Physics, Thirteenth Edition – Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Chapter 1 Units, Physical Quantities, and Vectors Modifications by Mike Brotherton
Copyright © 2012 Pearson Education Inc. Goals for Chapter 1 Three fundamental quantities of physics: meters, kilograms, and seconds To keep track of significant figures in calculations To understand vectors and scalars and how to add vectors graphically To determine vector components and how to use them in calculations To understand unit vectors and how to use them with components to describe vectors To learn two ways of multiplying vectors
Copyright © 2012 Pearson Education Inc. Standards and units Length, time, and mass are three fundamental quantities of physics. The International System (SI for Système International) is the most widely used system of units. In SI units, length is measured in meters, time in seconds, and mass in kilograms. Sorry – I know engineers sometimes (often?) use other units!
Copyright © 2012 Pearson Education Inc. Unit prefixes Table 1.1 shows some larger and smaller units for the fundamental quantities.
Copyright © 2012 Pearson Education Inc. Uncertainty and significant figures—Figure 1.7 The uncertainty of a measured quantity is indicated by its number of significant figures. For multiplication and division, the answer can have no more significant figures than the smallest number of significant figures in the factors. For addition and subtraction, the number of significant figures is determined by the term having the fewest digits to the right of the decimal point. As this train mishap illustrates, even a small percent error can have spectacular results!
Copyright © 2012 Pearson Education Inc. Unit consistency and conversions An equation must be dimensionally consistent. Terms to be added or equated must always have the same units. (Be sure you’re adding “apples to apples.”) Always carry units through calculations. How many meters in a light year?
Copyright © 2012 Pearson Education Inc. Vectors and scalars A scalar quantity can be described by a single number. A vector quantity has both a magnitude and a direction in space, or… In this book, a vector quantity is represented in boldface italic type with an arrow over it: A. The magnitude of A is written as A or |A|.
Copyright © 2012 Pearson Education Inc. Adding two vectors graphically—Figures 1.11–1.12 Two vectors may be added graphically using either the parallelogram method or the head-to-tail method.
Copyright © 2012 Pearson Education Inc. Components of a vector—Figure 1.17 Adding vectors graphically provides limited accuracy. Vector components provide a general method for adding vectors. Any vector can be represented by an x-component A x and a y- component A y. Use trigonometry to find the components of a vector: A x = Acos θ and A y = Asin θ, where θ is measured from the +x-axis toward the +y-axis.
Copyright © 2012 Pearson Education Inc. Calculations using components We can use the components of a vector to find its magnitude and direction: We can use the components of a set of vectors to find the components of their sum:
Copyright © 2012 Pearson Education Inc. Unit vectors—Figures 1.23–1.24 A unit vector has a magnitude of 1 with no units. The unit vector î points in the +x-direction, points in the +y- direction, and points in the +z-direction. Any vector can be expressed in terms of its components as A =A x î+ A y + A z.
Copyright © 2012 Pearson Education Inc. The scalar product—Figures 1.25–1.26 The scalar product (also called the “dot product”) of two vectors is Figures 1.25 and 1.26 illustrate the scalar product.
Copyright © 2012 Pearson Education Inc. Calculating a scalar product [Insert figure 1.27 here] In terms of components, Example 1.10 shows how to calculate a scalar product in two ways.
Copyright © 2012 Pearson Education Inc. The vector product—Figures 1.29–1.30 The vector product (“cross product”) of two vectors has magnitude and the right- hand rule gives its direction. See Figures 1.29 and 1.30.
Copyright © 2012 Pearson Education Inc. Calculating the vector product—Figure 1.32 Use ABsin to find the magnitude and the right-hand rule to find the direction. Refer to Example 1.12.
Copyright © 2012 Pearson Education Inc. PowerPoint ® Lectures for University Physics, Thirteenth Edition – Hugh D. Young and Roger A. Freedman Lectures.
Copyright © 2008 Pearson Education Inc., publishing as Pearson Addison-Wesley PowerPoint ® Lectures for University Physics, Twelfth Edition – Hugh D. Young.
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