Download - Physical Science Mr. Barry
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Graphing in SciencePhysical ScienceMr. Barry
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Using Graphs•Graph: a visual display of information or
data•Shows Change!
▫Graphs show how two or more items change in relation to each other
•What is an example of two things that you could make a graph with?
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Features of a Graph•Title: each graph must have a title or it is
meaningless•Labels: each axis must be labeled and have a
unit•Axes: x and y axes represent the change in
different variables•Variable: a quantity subject to change
▫Independent: changed during experiment or observation (ALWAYS on x-axis)
▫Dependent: changes as a result of change in the independent variable (ALWAYS on y-axis)
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Example•What is the title?•What does the x-axis
represent? The y-axis?•What is the
independent variable?•What is the dependent
variable?•What can we conclude
from looking at this graph?
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Types of Graphs• Bar Graphs: compares
information gathered by counting▫Ex: number of students in
this class of a certain age• Circle Graphs (Pie Graph):
shows how a whole can be broken down into parts (percentages)▫Ex: percent of students in
the school that are in certain science classes
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Types of Graphs•Line Graphs: shows a
relationship where one variable (dependent) changes as a result of another variable (independent)▫This is the type of graph
most helpful for science▫More than one
relationship can be shown on a line graph
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Making a Line Graph•1. Put all of your information into a chart with
columns for the independent variable and the dependent variables
•2. Find the largest value in each column. Increase that value to an easily divisible number
•3. Make increments on each axis equal to parts of the easily divisible number
•4. Plot each point in the chart. Connect each plotted point
•5. Done!
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Example•Jack’s little brother Jim is
just learning to walk. He walks 1 m in 6 s, 2 m in 13 s, 3 m in 19 s and 3.5 m in 27 s. He needs to graph this information for a class at school. Help him out!
Independent Dependent Variable Variable
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ExampleTitle:
y-axis:
x-axis:(0,0)