The vertical intercept of the physics equation is the value of the vertical axis variable when the horizontal axis value is zero and will have the units of the vertical axis.The slope of the physics equation may have an important physical meaning and is related to a quantity that remains constant throughout the experiment.We call this equation the physics equation since it is written in the variables from our experiment. Write the equation of the best fit line using the real physical variables from your experiment.To get the graphs to fit the screen well, under the Page. Pick two points that are reasonably spaced (one near the beginning of the line and one near the end). If not, make a test plot to attempt to linearize the graph: a. Calculate the slope of your best fit line (with units) by selecting two points from the best fit line.Draw a best fit line USING A RULER! DO NOT CONNECT DOTS!!.If the new graph (using the calculated column) is straight, you have succeeded in linearizing your data.Plot a new graph using your new calculated column of data on one of your axes.Make a new calculated column based on the mathematical form (shape) of your data.Each shape represents data that exhibits a different mathematical form.ĭraw a best fit line and calculate the slope. There are four possibilities for graph shapes that we will deal with. So, if we are confronted with non-linear (curved) data then our goal is to convert the data to a linear (straight) form that can be easily analyzed. However, if we can convert the data to a linear (straight) form we can use our knowledge of straight lines to learn about the physics involved in our experiment. Non-linear data is mathematically difficult to analyze. If your data graphs as a curve, the variables you have plotted have a non-linear mathematical form or relationship. Also, thanks to Jane Nelson, Orlando, FL, for the memorable naming of graph shapes. Adapted from Graphical Methods Summary - Modeling Instruction - AMTA.
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