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# Ss skillset3

## by gruszecki1 on Sep 04, 2011

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## Ss skillset3Presentation Transcript

• SKILL SET 3 Drawing and Interpreting Graphs GRADE 11 PHYSICS - SPH3U
• Graphing
• In science, we often perform experiments that result in the generation of data. By graphing the data, we may be able to find a relationship between the variables measured. We may also want to communicate our results with others . In order to do this, we must use a standard method when plotting graphs.
• Standards for Graphing
• The independent variable is plotted horizontally
• The dependent variable is plotted vertically
• Decide if the origin ( 0, 0 ) is a valid data point – if not, do not use this point!
• All graphs need a title.
• The scale used should spread the data out.
• Units of measure, for each axis, must be given.
• Circle all data points, this indicates that there may be error in the data.
• Standards for Graphing
• This graph contains circled data points, labeled axes, a title, units and a scale
• Standards for Graphing
• Often, we may want to draw a line of best fit (or trend line). The rule is to have an equal number of data points above the line as there are below the line. Some points may be on the line.
• The trend line is solid within the data range and dashed outside of the data range
• Standards for Graphing
• After creating our graph, we may want to use it to find values that are within the data range. We call this interpolation .
• If we want to find values outside of the data range, we extrapolate . This is where the dashed line is.
• Once the trend line is created, we no longer make use of individual data points. For example, the circled point (8,10) would be replaced by point (8,8) – which is on the trend line - point (8,10) is assumed to have error.
• Other Types of Relationships
• Area Under a Curve
• Consider the area under the velocity-time graph.
• The area under the line would be 80 (m/s) x (s), or 80 m.
• The units of the area tells us that this is a measure of ________
• Homework
• Page 767 #1-3, use MS-Excel to graph 1,2
• Read pages 768-771 and try questions #1-9. Skill Set 4 is a review of math skills.
• See File: Excel-Graph-Instructions for tips on how to use Excel