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Bell Ringer
Think and Write Individually: Describe each of the following properties of stars in your own words and identify the unit used to measure each.
Mass
Luminosity
Radius
Temperature
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Pair
Discuss your answers with your elbow partner
Determine where you agreed and where you disagreed
On answers where there was a disagreement, discuss your reasoning and try to arrive at a consensus if possible
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Share – cold call
mass - the amount of matter that makes up an object, measured in grams (g)
luminosity (aka absolute magnitude) - the actual brightness of a star, measured in comparison to brightness of the Sun
temperature - the average kinetic energy of particles, measured in K
radius - the distance from the center to any point on the circumference of a circular or spherical object, measured in km
What is another term for luminosity? - absolute magnitude
What is another property we can use to describe stars? - color, density, volume
What is the difference between mass and weight? - mass describes the amount of matter that makes up the object while weight measures the force of gravity acting on an object
Which property has the greatest influence on all the other properties? - mass has the greatest influence on the other properties
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Today you will…
1) describe the physical properties of stars 2) create a scatterplot diagram using data for these properties 3) analyze the scatterplot patterns to describe the relationships between the properties
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5. Properties of Homo sapiens
Brainstorming Session: What are some properties that we can use to describe ourselves?
Possible answers include but are not limited to: hair color, eye color, height, skin color, hair texture, body type, personality
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6. What causes these properties?
Image from:
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Inquiry
How can the relationship between foot size and height be graphically represented?
Discuss – whole class
Students may respond with line graph or scatterplot. If students answer “bar graph” review that the purpose of a bar graph is to compare two different things.
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Task – you will:
Measure your height and foot size
On a sticky note, write your name, height and foot size
Determine where your sticky note should be placed on the graph
Raise your hand when you’re ready and wait for teacher
After you have placed your data point on the graph, please return to your seat and wait silently until everyone has placed their data
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Class Agreements
How will we measure?
Which units will we use?
What should we use for the range of the axes?
Which property should go on which axis?
How will you measure height and foot size (method and units)? chart paper, meter stick
Why wouldn't we use shoe size? shoe sizes vary by manufacturer, gender, shoe style
Shoes on or off? - off
Which part of the foot are you measuring? longest part, from toe to heel
Which property will be graphed on which axis?  height
Which place value will you record data?  100ths
What should we use for the range (mins and maxes?)  just below the shortest student to just above the tallest student
On which axes should each variable be placed? - height on x axis, foot size on y-axis
Form a hypothesis: what kind of relationship do you think the data will show? - answers may include positive or negative correlation
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Check the graph
Give a thumbs up if you agree, thumbs down if you disagree.
What relationships can we describe based on the data?
Is there an independent and dependent variable? No, one factor doesn’t affect the other
Is this relationship most likely a causation or correlation?  Why? Correlation, there is no cause/effect relationship
Do you think there will be a positive or negative correlation?  Why? There is a positive correlation because one factor increases as the other increases
What did you notice that was unusual about the x-axis?  The sequence of values is reversed from the standard format (lower values are on the right and higher values are on the left)
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Your individual task
You will plot the temperature and luminosity of stars and describe the relationship between them
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Foot Size (cm)
Analyze and discuss graph:
What should we use for the range (mins and maxes?)
On which axes should each variable be placed?
Is there an independent and dependent variable?
Is this relationship most likely a causation or correlation?  Why?
Do you think there will be a positive or negative correlation?  Why?
What did you notice that was unusual about the x-axis? What do you think the advantages are of sequencing the data in this way?
Height (cm)
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13. What causes the properties of stars?
Mass
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14. Task directions and materials
Task sheet
Color pencils
Ruler
Questions?
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Can we…..?
1) describe the physical properties of stars
2)  create a scatterplot diagram using data for these properties
3)  analyze the scatterplot patterns to describe the relationships between the properties
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16. 1. What is the term that describes the brightness of a star
Lumens
Luminosity
Mass
Amplitude B
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2. What is the property that determines the temperature, brightness, and color of stars?
Radius
Mass
Volume
Density B
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18. 3. What is the relationship between height and foot size?
Causation – height influences foot size
Positive Correlation
Negative Correlation
Causation – foot size influences height B
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19. 4. Human is to DNA as Star is to __________________
Temperature
Radius
Nebula
Mass D
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20. 5. Which color stars are hottest?
Red
Orange
Yellow
Blue D
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