BELLWORK : 8/16-17/12
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Transcript of BELLWORK : 8/16-17/12
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BELLWORK : 8/16-17/12
Think of a question that you could answer through an experiment:
What is the question?
How would you setup the experiment?
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Introduction to Science
1 – The Nature of Science
2 – The Way Science Works
3 – Organizing Data
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Online Textbook Access
• Go to URL– http://my.hrw.com
• Username– jstudent537
• Password– s7v8j
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1 – The Nature of Science
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Key Terms• Science – Knowledge obtained by observing
natural events and conditions to learn facts, principles, laws
• Technology – Application of science for practical purposes
• Law – A descriptive statement or equation that predicts events under certain conditions
• Theory – System of ideas explaining related observations and supported by evidence
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How Science Takes Place
• A scientist may perform experiments to find a new aspect of the natural world, to explain a known phenomenon, to check the results of other experiments, or to test predictions of current theories
• Examples – New materials for computer chips that make processing speeds/phones more advanced
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How Science Takes Place
• Examples – TVs were built after the early cathode ray tubes were developed in the late 19th century
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Scientists Experiment
• Answer questions by investigating
• Sometimes these are old questions, sometimes new
• Often, questions arise from observations
• Investigate by designing/conducting experiments
• Experimental results are confirmed ( repetition )
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Observe
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Branches of Science
• Natural Science: Biological, Physical, Earth
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Working Together
• Different branches of science work together, along with technology
– Example: Applying newer computer-chip materials into actual designs ( Razr, self-cooled labtops )
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Laws & Theories – Always Tested
• Laws allow predictions to be made about how a system will behave under given conditions– GRAVITY
• Theories explain HOW a process takes place– PLATE TECTONICS
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Models
• Mathematics is useful to describe events
– Gravity has an equation
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Models• Models can represent physical events• Used in daily life– Hurricane trajectories– Weather predictions
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BELLWORK : 8/20/12Which popcorn is the better deal?
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Last Week
• Discussed the fundamental nature of science
• Also worked on observation skills
• Anyone observe something interesting over the weekend?
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Introduction to Science
1 – The Nature of Science
2 – The Way Science Works
3 – Organizing Data
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2 – The Way Science Works
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Science Skills
• Identifying problems
• Planning experiments
• Recording observations
• Correctly reporting data
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Critical Thinking
• Involves asking questions, making observations, and using logic
• Surprise!!
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BELLWORK : 8/20/12Which popcorn is the better deal? Discuss
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Units of Measurement
• In your notes, list 5 you can think of.
• Do these relate to length, mass, weight, time, volume
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Units of Measurement
• Scientists use standard units of measure – SI System
• Meters, grams, Seconds
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Units of Measurement• SI ( System Internationale ) used for consistency• Prefixes allow for easy converting
• EXAMPLES:• m km
• kg g
• seconds milliseconds
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Exit Pass – Unit Conversions
• Study Guide – Pg 3
• Problem 3
• Remaining Time – Problems 1, 5 & 6
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Bellwork – 08/21/12
• Study Guide – Pg 3
• Problem 3
• Finished? – Questions 1, 5 & 6
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Help with # 1, pg 3
• Microscopes – magnify ( make larger ) small objects
• Telescopes – magnify objects far away• Radio telescope – detect radio waves from objects
• Spectroscopes – separate light into a rainbow
• Ruler – finds length
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Key Terms
• Variable – A factor changing in an experiment
• Length – Measure of the straight-line distance between two points
• Volume – The space occupied by an object
• Mass – Amount of matter in an object
• Weight – Amount of gravitational force on object
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Scientific Method – Use Colors!!
• Notice there is more than time where you observe
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Are They The Same?
• Are they the same? - Hypothesis
• How can we test your hypothesis?
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Bellwork – 8/23/12
• Study Guide
• Finish pg. 3 - #2 , #4
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Introduction to Science
1 – The Nature of Science
2 – The Way Science Works
3 – Organizing Data
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Presenting Scientific Data
• Scientists use written reports and oral presentations
• To share results
• Organizing/Presenting this info is important
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Line Graphs• Show continuous changes• Time : Independent Variable
(x-axis)• Doesn’t DEPEND on anything
• Gas Volume : Dependent Variable (y-axis)
• Depends on something else
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Demonstration
• Gas-Producing Reaction
• Lots of gas at first, then slows down
• Adding Vinegar to Baking Soda makes CO2
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Bar Graphs
• Compares similar data for different items or events
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Pie Chart Graphs
• Shows parts of a whole ( or parts of 100% )
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Lab Activity – Motion Graphing
• If we do not take this seriously or respect the equipment, we will not use this setup again
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Lab Activity – Motion Graphing
• Each group goes to their station
• One person logs into network/labtop
• Open Logger Pro Software
• Open file “01a Graph Matching”
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Lab Groups – 3rd Period• Station 1 – Mackenzie, Alexandria, Jean
• Station 2 – Kandice, Ryan, Shane
• Station 3 – Megha, Brittany, Alex
• Station 4 – Shelby, Sean, Chris, Jayda
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Lab Groups – 5th Period• Station 1 – Heather, Aaron, Bhavin, Kennedy
• Station 2 – Taylor, Deshun, Catherine, Becky
• Station 3 – Keyra, Hannah, Caleb, Terrell
• Station 4 – Ashleigh, Bryanna, Jarion, Jay
• Station 5 – Zechariah, Bill, Bryant, Josh
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Lab Groups – 6th Period• Station 1 – Chance, Steven, EJ, Alex
• Station 2 – Daniel, Torey, Robert
• Station 3 – Brennen, Justin, Mac, Alek
• Station 4 – Odalis, Garrett, Jacq
• Station 5 – Megan, Tomaria, Ross, Andrew
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Lab Groups – 7th Period• Station 1 – Jennifer, Ruby, Cody, Brooke, Austin
• Station 2 – Raivan, Drake, Tiffani, Brandon, Kaitlyn
• Station 3 – Isiah, Michael, Layton, Sarah
• Station 4 – Kirsty, Will, Katlyn, Larry
• Station 5 – Ben, Aaron, Monica, Adam
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Procedure
• Collect data by hitting green “Collect” button
• You will hear Motion Detector “clicking”
• You will also see data collected an graph
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Lab Activities
• Turn the detector on and stand still in front of it
• What do you see on a distance vs. time graph?
• Repeat the test but slowly move away from the detector
• What do you see?
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Lab Activities
• Turn the detector on and move back and forth in front of it ( get far away, move closer )
• What do you see on a distance vs. time graph?
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GRADE - Graph
• Setup a graph of distance vs time for a person
• What would it look like if someone is moving away from these detectors at constant speed?
• What type of graph is this ( line, bar, pie chart )?
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Bellwork - 08/27/12
• What does it mean to be precise?
• QUIZ – Thursday ( 6th ) and Friday
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Precision & Accuracy
• Precision: the exactness of a measurement• Accuracy: how close a measurement is to the
true value
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Applying Precision - Accuracy
• Scientists use significant figures to show precision of a measured quantity
• Significant figure: Prescribed decimal place determining the amount of rounding-off when assessing the precision of a measurement
• Round your answers to the correct significant figures
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LAB Activity - GRADE
• Get 50 points for participation• If I see not participating in one way or the other –
less than 50 points
• Document on Projector Screen ( 1 / group )
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Bellwork - 08/29/12
• Think of the paper-wad toss we did yesterday. Would it be accurate, precise, neither, both in the following situation? – 4 made it in the basket, 1 landed far away
• QUIZ – Thursday ( 6th ) and Friday ( 3rd, 5th, 7th )
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Significant Figures – Counting Rules
• ALL non-zero digits are Significant• Leading and trailing zeros are not significant– 2500 and 0.000036 have TWO Significant Figures
• Zeros in between Non-Zeros are significant– 2501 and 2003 have FOUR Significant Figures
• Zeros after a decimal point ARE SIGNIFICANT– They do not begin the number– 25.00 and 15.10 have FOUR Significant Figures
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Chpt 1 Quiz
• Scientific method• Branches of science• Metric conversions • units (length - meters, mass - grams, time - sec)• Types of graphs• Precision and accuracy
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Significant Figures – Adding/Subtracting
• The answer cannot have more decimal places than the least number of decimal places in the calculation
• Add 15.1 to 3
• The answer is 18
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Scientific Notation
• Earlier examples with TWO Significant Figures:– 2500 and 0.000036
• Want to shrink the number down to:– Number between 1 and 10– Multiply by a power of 10
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Scientific Notation
• Earlier examples with TWO Significant Figures:– 2500 and 0.000036
• Becomes ( but they are the same number ):– 2.5 x 103
– 3.6 x 10-5
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Scientific Notation
• How to write this out:– 2500 ( have to move 3 places to left) 2.5– 0.000036 ( have to move 5 right ) 3.6
• Positive or Negative Exponent on Power of 10?– 2.5 x 103 : 2.5 is SMALLER than original 2500– 3.6 x 10-5 : 3.6 is LARGER than original 0.000036
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Study Guides – Pg. 4
• Do entire page ( Take home, study this and notes )
• Look at/Work through Pretest to study also
• When done– ask for Unit Conversions worksheet back– Correct/Finish Worksheet
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Unit Conversion/Scientific Method Worksheets
• Improve your work ( finish blanks / correct mistakes )
• Show work on separate piece of paper
• No work – grade stays the same
• Something similar will be for homework next time