(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

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 (C) Copyright 2014 - all rights reserved www.cpalms.org

What causes these properties? Image from: http://commons.wikimedia.org/wiki/File:DNA_simple2.svg (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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. (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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) (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org Your individual task You will plot the temperature and luminosity of stars and describe the relationship between them (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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) (C) Copyright 2014 - all rights reserved www.cpalms.org

What causes the properties of stars? Mass (C) Copyright 2014 - all rights reserved www.cpalms.org

Task directions and materials Task sheet Color pencils Ruler Questions? (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 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 (C) Copyright 2014 - all rights reserved www.cpalms.org

1. What is the term that describes the brightness of a star Lumens Luminosity Mass Amplitude B (C) Copyright 2014 - all rights reserved www.cpalms.org

(C) Copyright 2014 - all rights reserved www.cpalms.org 2. What is the property that determines the temperature, brightness, and color of stars? Radius Mass Volume Density B (C) Copyright 2014 - all rights reserved www.cpalms.org

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 (C) Copyright 2014 - all rights reserved www.cpalms.org

4. Human is to DNA as Star is to __________________ Temperature Radius Nebula Mass D (C) Copyright 2014 - all rights reserved www.cpalms.org

5. Which color stars are hottest? Red Orange Yellow Blue D (C) Copyright 2014 - all rights reserved www.cpalms.org