Lecture_3 - Important stuff you should know Weird math in...

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1 Important stuff you should know Weird math in examples 3.6 and 3.7. 2.8-4.2=-1.4!!!!! Long HW (#4) due tomorrow
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2 Old 3.7 Significant Figures, if you have the old version of the text, but a good brief primer. Details via email. I am not too picky, as long as you are sensible. Exception: formal lab report. The rule for addition and subtraction is different than the rule for multiplication and division For adding and subtracting, the number of decimal places is the important consideration For multiplying and dividing, the number of significant figures is the important consideration
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3 New 3.7 Scalars and Vectors (at warp speed-I will just flip through these unless there are questions…) A scalar quantity is completely… Specified by a single value (number) with an appropriate unit (magnitude) Can either be positive or negative Has no direction . Speed is an example of a scalar quantity Remember speed is always positive
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4 3.7 Scalars and Vectors Last time we used it in our examples: A vector quantity is completely described by a number , appropriate units , and a direction . Vector nature of a quantity is always dependent on a coordinate system . You define the coordinate system (problem dependent) A simple + or - sign will do for vector direction in a 1-D problem.
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5 3.7Scalars and Vectors: Adding formality Unit Vector A vector that specifies both the unit of measure and the direction of a reference axis. Here unit vector is represented as an arrow… Length of one unit Pointing in the positive x-direction Some common conventions x -axis: i y -axis: j z -axis: k y(m)
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6 3.7 Scalars and Vectors Multiply a unit vector by a scalar quantity… You get a vector quantity
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7 3.7 Scalars and Vectors Position Vector Final position vector Initial position vector Remember how position & displacement relate
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8 3.7 Scalars and Vectors Adding
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Lecture_3 - Important stuff you should know Weird math in...

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