science skills 2.3
DESCRIPTION
SCIENCE SKILLS 2.3. Chapter Two: Science Skills. 2.1 Mass and Volume 2.2 Density 2.3 Graphing 2.4 Solving Problems. Section 2.3 Learning Goals. Use graphs to create a visual representation of data. Analyze trends on a graph. - PowerPoint PPT PresentationTRANSCRIPT
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SCIENCE SKILLS 2.3
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Chapter Two: Science Skills
2.1 Mass and Volume2.2 Density2.3 Graphing2.4 Solving Problems
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Section 2.3 Learning Goals
Use graphs to create a visual representation of data.
Analyze trends on a graph.Explain the difference between a direct relationship and an inverse relationship.
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Investigation 2C
Key Question: What is the thickness of
aluminum foil?
Thickness of Aluminum Foil
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2.3 Graphing A graph is a visual way to
organize data.
A scatterplot or XY graph is used to see if two variables are related.
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2.3 Graphing A bar graph
compares data grouped by a name or category.
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2.3 Graphing A pie graph
shows the amount each part makes of up of the whole (100%).
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2.3 Graphing A “connect-the-dots” line graph
is often used to show trends in data over time.
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2.3 How to make an XY graphScatterplots show how a change in one
variable influences another variable.The independent variable is the
variable you believe might influence another variable.
The dependent variable is the variable that you hope will change as a result of the experiment.
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2.3 How to make an XY graphPressure is critical to safe diving.How does an increase in depth affect the pressure?
What sort of graph would best show the relationship between pressure and depth?
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2.3 How to make an XY graph1. Choose x and y-axis Depth is the independent variable = x axis Pressure is the dependent variable = y
axis2. Make a scale Most graphs use ones, twos, fives or tens OR calculate the value per box
3. Plot your data 4. Create a title* Exception- when time is a variable
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2.3 Identifying graph relationshipsIn a direct
relationship, when one variable increases, so does the other.The speed and distance variables show a direct relationship.
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2.3 Identifying graph relationships
When there is no relationship the graph looks like a collection of dots.
No pattern appears.
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2.3 Identifying graph relationshipsIn an
inverse relationship, when one variable increases, the other decreases.
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2.3 Reading a graphWhat is the speed of the car at 50 cm?
1. Find the known value on the x axis Position = 50 cm
2. Draw a line vertically upward from 50 cm until it hits the curve.
3. Draw a line across horizontally to the y-axis from the same place on the curve.
4. Read the speed using the y axis scale. Speed = 76 cm/s